Monday, June 29, 2020

Fibre to fabric class 7 NCERT

Subject: Fibre to fabric class 7 NCERT Notes

Fibres:- Thread/filament which forms constituent of various composite material.

Types of fibres:- two types
1. Natural fibres
2. Artificial fibres

Natural fibres obtained from plants and animals.
 Example:- Jute, Flax, Cotton, Hemp, Coir, tree wool, wool, silk etc.

Man-made fibres are called artificial fibres. 
Example:- Nylon, Rayon(Artificial silk), Polyester etc 

In this chapter we will learn about Animal fibres:- wool and silk

Fleece:- hair of sheep or yak from which wool obtained.

Animal fibre:-Fibres obtained from animals e.g. Wool and Silk

WOOL:- 
  • Obtained from skin hair of fat animals.
  • Wool comes from sheep, goat, yak and some other animals.
Why animals have such fur?
  • Because hair trap a lot of air.
  • Air is a bad conductor of heat 
  • So hair keeps these animals warm.
  • Wool is derived from these hairy fibres.

Types of fibres that obtained from sheep fleece:-
1. The coarse beard hair
2. The fine soft under- hair close to skin.
Fine hair provide the fibres for making wool.

Selective breeding:-
  •  The process of selecting parents for obtaining special characters in their offspring, such as soft under hair in sheep, us terms 'selective breeding'.

Animals that yield wool:
  • Commonly available wool in market is sheep wool.
  • Yak wool is common in Tibet and Ladakh.
  • Mohair is obtained from angora goats found in hilly region such as Jammu and Kashmir.
  • Also obtained from goat hair.
  • Under fur of Kashmir goat is soft and is used to woven into fine shawls called Pashmina shawls.
  • Camel fur, Llama and Alpaca found in South America also yield wool.

FROM FIBRES TO WOOL:- 
For obtaining wool, sheep are reared. Their hair is cut and processed into wool.

Rearing and breeding of sheep:-
  • Feeding sheep properly by providing them grass mixed with pulses, corn, Jowar, oil cakes and minerals.
  • In winter, sheep are kept indoors and fed on leaves, grain and dry fodder.
  • Certain breeds of sheep have thick coat of hair on their body which yields good quality wood in large quantities. 
  • Once the reared sheep have developed a thick growth of hair, hair is shaved off for getting wool.

Sheep are reared in many parts of our country for wool. Some Indian breeds of sheep are listed below:-

PROCESSING FIBRES INTO WOOL:-
  • The wool which is used for knitting sweaters or for wearing shawls is the finished product of a long process, which involves the following steps:-
STEP 1:- SHEARING:- 
  • The fleece of sheep along with a thin layer of skin is removed from its body. This process is called shearing.
  • The uppermost layer of skin of sheep is dead so it does not hurt the sheep.
  • Hair removed during summer so that they enable to survive without protective coat of hair.
STEP 2:- SCOURING:- 
  • Sheared skin is washed in tanks to remove grease, dust and dirt. This is called scouring.
STEP 3:- SORTING:-
  • In factory , different textures of hairy skin are seperated .
STEP 4:- BURR PICKING:-
  • Burr are small fluffy fibres 
  • They are picked out from the hair.
  • The fibres are scoured again and dried.
  •  This is the wool ready to be drawn into fibres.
STEP 5:- DYEING:- 
  • The fibres can be dyed in various colours the natural fleece of sheep and goats is black, brown and white.
STEP 6:- ROLLING INTO YARN:-
  • The fibres are straightened, combed and rolled into yarn. 
  • The longer fibres are made into wool for sweaters and shorter fibres are spun and woven into woollen cloth.

The process of fibres into wool can be represented as follows:-
Shearing ---> Scouring ---> Sorting ---> Cleaning of burrs ---> Dyeing ---> Rolling.

SILK:- 
  • Animal fibres
  • Silkworms spin the silk fibres.
  • Rearing of silkworms for obtaining silk is called sericulture.
LIFE HISTORY OF SILK MOTH:-
  • 1. Female silk moth lays eggs from which larva hatch .
  • It's larva is called silkworms or caterpillars.
  • 2. They grow in size, weave a net to hold itself .
  •  It then swings its head from side to side 
  • During movements of head the caterpillar secretes fibre made of a protein.
  • This protein hardens on explosive to air and becomes silk fibre.
  • 3. Soon the caterpillar completely covers itself by silk fibres and turn into pupa.
  • This covering is known as cocoon.
  • 4. Further development of pupa into moth continues inside the cocoon.

NOTE:- Soft silk yarn is as strong as a comparable thread of steel.

  • The silk yarn (thread)  is obtained from the cocoon of silk moth.
  • There is a variety of silk moth and so different types of silk is available to us such as tassar silk, mooga silk, kosa silk, eri silk etc 
  • The most common silk moth is the mulberry silk moth.
  • This silk is soft, lustrous and elastic and can be dyed in beautiful colours.

FROM COCOON TO SILK:-
  • For obtaining silk, moth are reared and their cocoons are collected to get silk threads.
REARING SILKWORM:
  • 1. Female silk moth lays hundreds of eggs at a time .
  • 2. Farmers keep eggs under hygienic conditions and under suitable conditions of temperature and humidity.
  • 3.Eggs are warned to a suitable temperature for the larvae to hatch from eggs.
  • This is done when mulberry trees bear a fresh crop of leaves.
  • 4. The larvae eat day and night and increased in size.
  • After 20-30 days the caterpillars stop eating and move to a tiny chamber of bamboo in the tray to spin cocoons.
  • The caterpillar or silkworm spins the cocoon inside which develops the silk moth.

PROCESSING SILK:- 
  • A pile of cocoons is used for obtaining silk fibres.
  • The cocoons are kept under the sun or boiled or exposed to steam.
  • The silk fibres separate out.
  • The process of taking out threads from the cocoon fro use as silk is called reeling of silk.
  • Reeling is done by machine.
  • Silk fibres are then spun into silk threads, which are woven into silk cloth by weavers.

KEYWORDS:-

1.COCOON:-The caterpillar completely covers itself by silk fibres and turn into pupa.
This covering is known as cocoon

2.FLEECE:-Hair of sheep or yak from which wool obtained.

3.REELING:-The process of taking out threads from the cocoon fro use as silk is called reeling of silk.

4.SCOURING:-Sheared skin is washed in tanks to remove grease, dust and dirt. This is called scouring

5.SERICULTURE:-Rearing of silkworms for obtaining silk is called sericulture.

6.SHEARING:-The fleece of sheep along with a thin layer of skin is removed from its body. This process is called shearing.

7.SILK MOTH:-A large moth with a caterpillar that spins a protective silken cocoon.

8.SILKWORM:-Worm whose caterpillar make silk fibre.

9.SORTING:-In factory , different textures of hairy skin are seperated .

Thankyou ....

Tuesday, June 23, 2020

Transformation of sentences

Part 1 
Type:-1 How to transform affirmative sentence into negative sentence??

1. Man is mortal.
Ans:-Man is not immortal.
2. You are wise.
Ans:-You are not foolish.
3. He is a rich man.
Ans:-He is not a poor man.
4.I am innocent.
Ans:-I am not guilty.
5.She is always careful.
Ans:-She is never careless.
6. He is doubtful.
Ans:-He is not sure.
7. She dislikes me.
Ans:-She does not like me. ( Do/does +v1)
8:-He is dishonest.
Ans:-He is not honest.
9.It is harmful.
Ans:-It is not harmless.
10. He was healthy.
Ans:-He was not unhealthy.

Type:-2 How to transform affirmative sentence into negative sentence by using "no/not + without".

1. I love you.
Ans:-I am not without love for you.
2.She was wise.
Ans:- She was not without wisdom.
3.Every cactus plant has a thorn .
Ans:-There is no cactus plant without a thorn.
4.Where there is a will there is a way.
Ans:-There is no way without will.
5.Everyone hates her.
Ans:-There is no one who does not hate her
6.He was hopeful.
Ans:-He was not without hope.
7.Every gain has risk.
Ans:-There is no gain without risk.
8. Everyone makes a mistake.
Ans:-There is no one who does not make a mistake.
9.Every rose has a thorn.
Ans:-There is no rose without a thorn.
10.You have money.
Ans:-you are not without money.

Type3:- How to transform affirmative sentence into negative sentence by using "to fail"

1. He saw the Taj Mahal.
Ans:-He did not fail to see the Taj Mahal.
2.My son plays cricket.
Ans:-My son does not fail to play cricket.
3.He will help the helpless.
Ans:-He will not fail to help the helpless.
4.When you are late , your father beats you.
Ans:-Your father does not fail to beat u when you are late.
5. You must have seen the Golghar when you went to Patna.
Ans:-You must not have failed to see the Golghar when you went to e
6.Speak the truth.
Ans:-Dont fail to speak the truth.
7.I failed to see her when she came in.
I did not see her when she came in.

Thankyou ...see u tomorrow😃😃
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Part 2
Type4:- How to change "only/alone" to "none but" typed sentence.

1. Only a millionaire can afford such extravagance.
Ans:-None but a millionaire can afford such extravagance.
2. Only you can solve this problem.
Ans:-None but you can solve this problem.
3. The brave alone deserve the fair.
Ans:-None but the brave deserve the fair.
4. Only a foolish man would behave like this.
Ans:-None but a foolish man would behave like this.
5. Only the publisher has inspired me to write this book.
Ans:-None but the publisher has inspired me to write this book.

Type 5:-How to change "as soon as" to "no sooner ....then type" sentence

1. As soon as he saw me, he ran away.
Ans:-
2. As soon as I had reached the station, the train steamed off.
Ans:-
3. As soon as he arrives, he begins to work.
Ans:-
4. As soon as the bell rang, the boys ran out of their classes.
Ans:-
5. As soon as he came, he made objections
Ans:-
 
Type:-6 whenever/when ---> never but .
1. Whenever the child cries, the mother loves it.
Ans:-The child never cries but the mother loves it.
2. Whenever I go to you, I don't find you.
Ans:-I never go to you but I don't find you.
3. It always pours when it rains.
Ans:-It never rain but it pours.
4.Whenever she sees me , she is reminded of her lover.
Ans:-she never sees me but is reminded of her lover.
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Ty




Part 3
Type:-6 
1.He is as strong as I.
Ans:-
2.She is as tall as Nilu.
Ans-
3.He is as good as Aditya.
Ans:-
4.I know him as well as you do.
Ans:-

Type 7
1.He is more intelligent than I. 
Ans:-
2.You are duller than your brother.
Ans:-
3.The aeroplane flies faster than birds.
Ans:-
4.Iron is more useful than any other metal.
Ans-
5.Ashoka was greater than most other kings.
Ans:-
6.They have more money than honesty
Ans:-

Type :-8
1.Iron is the most useful of all metals.
Ans:-
2.America is the richest country in the world.
Ans:-
3.Kolkata is the largest town in India.
4.Ashoka was one of the greatest of king.
Ans:-




Part 4
Type :-9 
1.Mumbai is richer than any other town in India.
Ans:-
2.Delhi is better than all other towns in India.
Ans:-
3.Pt. Nehru was greater than all other men in India.
Ans:-
4.Gold is heavier than most other metals.
Ans:-

Type :-10
1.He is too proud to apologize.
Ans:-
2.He is too honest to accept a bribe.
Ans:-

Type 11
1.He is so kind hearted that he will forgive me.
Ans:-
2. The house is so large that it will accommodate all of us.
Ans:-

Type 12 
1.He is a good musician 
Ans:-
2.She is a woman of marked intelligence.
Ans:-
3.I abstain from wine.
Ans:-
4.My brother went to school everyday.
Ans:-
5.It is unique.
Ans:-
6.I lived only a few years in Darbhanga.
Ans:-
7.All the children wept.
Ans:-
8.Only a few persons would be cruel to a beggar.
Ans:-
9.I seldom go there.
Ans:-
10.The two brothers are alike.
Ans:-
11.They won all the matches.
Ans:-




Part 5 Transformation of negative sentence into affirmative sentence.
Type 1
1. Never tell a lie.
Ans:-
2.He was not gallant.
Ans:-
3.Your brother is not intelligent.
Ans:-
4.He will never forget her.
Ans:-
5.They are not industrious.
Ans:-
6.He doesn't believe in God.
Ans:-
7.We are not immortal.
Ans:-
8.You are not inferior.
Ans:-
9.He was not learned.
Ans:-
10. Nothing is impossible.
Ans:-

Type 2 
1.He is not without love for her.
Ans:-
2.I am not without honesty.
Ans:-
3.There is no girl who is not playing.
Ans:-
4.The author did not lead any book uncorrected.
Ans:-
5.There is no smoke without fire.
Ans:-
6.The two sisters are not unlike each other.
Ans:-
7.There was no one present who did not cheer.
Ans:-
8.No one could deny that she was pretty.
Ans:-
9.There is no thunder without lighting.
Ans:-
10.No body will deny that he did his best.
Ans:-Every body will admit that he did his best.



Part 6 Transformation of negative sentence into affirmative sentence.
Type 3:-
1.He did not fail to see the Qutub Minar.
Ans:-He saw the Qutub Minar.
2.My daughter didn't fail to respect her teacher.
Ans:-My daughter respected her teacher.
3.Yor didn't fail to obey your teachers.
Ans:-You obeyed your teachers.
4.He didn't buy the book.
Ans:-He failed to buy the book.
5.She did not fail to appear at the SBI Clerk examination.
Ans:-She appeared at the SBI Clerk examination.

Type 4:-
1.None but you wanted to help her.
Ans:-Only you wanted to help her.
2.None but Aditi can do this work 
Ans:-Only Aditi can do this work .
Or
     Aditi alone can do this work.
3.None but the rich can but this luxurious car.
Ans:-Only the rich can but this luxurious car.
4.None.but graduates can apply for this post.
Ans:-Only graduates can apply for this post 
Or 
     Graduates alone can apply for this post.
5.None but the brave deserve the fair.
Ans:-Only the brave deserve the fair.

Type 5:-
1.The child never cries but the mother loves it.
Ans:-Whenever the child cries , the mother loves it .
2.I never go to you but I do not find you.
Ans:-Whenever I go to you , I do not find you.
3.It never rains but it pours.
Ans:-It always pours when it rains.
4.She never sees me but is reminded of her lover.
Ans:-Whenever she sees me, she is reminded of her lover.

Type 6
1.He is not so fat as I .
Ans:-I am fatter than he.
2.Meena is not so beautiful as Veena.
Ans:-Veena is more beautiful than Meena.
3.He is not as good as Vikas.
Ans:-Vikas is better than he.
4.I am not as tall as you.
Ans:-You are taller than I.
5.No other bowler in the Indian Cricket team is so good as Jahir Khan.
Ans:-Jahir khan is better than any other bowler in the Indian Cricket team .
6.No other story book is so popular as the Arabian Nights.
Ans:-The Arabian Nights is more popular than all other story books.







Part 7 Transformation of negative sentence into affirmative sentence.
Type 7
1.He is not wiser than you.
Ans:-You are as wise as he.
2.I am not duller than you.
Ans:-You are as dull as I
3.She doesn't know you better than I do.
Ans:-I know you  as well as she does.
4.He does not have more money than honesty.
Ans:-He has as much honesty as money.
5.You can't run faster than a horse.
Ans:-A horse can run as fast as you.
6.Copper is not more useful than Iron.
Ans:-Iron is as useful as copper.

Type 8
1.No other peak in the world is as high as Mt. Everest.
Ans:-Mt. Everest is the highest peak in the world.
2. No other animal is so ferocious as the tiger.
Ans:-The tiger is the most ferocious in the world.
3.Very few buildings are so beautiful as the Taj Mahal.
Ans:-The Taj Mahal is one the most beautiful buildings.
4.Very few metals are as costly as gold.
Ans:-Gold is one of the costliest metals .

Type 9.
1 He is too clever not to understand the tricks.
Ans:-He is so clever that he will understand the trick.
2.Your speech is too impressive not to impress the audience.
Ans:-Your speech is so impressive that it will impress the audience.

Type10
1.He was so weak that he could not play.
Ans:-He is too weak to play.
2.The news is so good that it can't be true.
Ans:-The news is too good to be true.

Type 11 🌟
1.His services can't be forgotten.
Ans:-His services have been too great to forgotten.

Type 12
1.Your fortune did not improve with time.
Ans:-Your fortune became worse with time.
2.Dont make a noise.
Ans:-Keep quite.
3.He is no fool.
Ans:-He is a clever man.
4 Don't smoke here.
Ans:-Refrain from smoking here
5.He was asked not to smoke.
Ans:-He was prohibited from smoking.
6.I didn't find the road very bad.
Ans:-I found the road fair.
7.Not many people were present there.
Ans:-Only a few people were present there.
8.There is nothing similar in the world.
Ans:-Everything is dissimilar in the world.
9.Don't spit here.
Ans:-Refrain from spitting here.
10.She didn't live for many days in Patna.
Ans:-She lived for only a few days in Patna.
11.Lata is no mean singer .
Ans:-Lata is a good singer.

135 sentence covered .Ty

Sunday, June 14, 2020

Class7 Inside our earth

Inside our earth:-
Introduction:-
  • The earth is a dynamic planet.
  • It is constantly undergoing changes inside and outside.
Interior of the earth:-
  • The earth is made up of several concentric layers with one inside another.
  • Crust:- The uppermost layer over the earth's surface is called crust.
  • It is thinnest of all the layers
  • It is about 35 Km on the continental masses and only 5 Km on the ocean floor.
  • The main mineral constituents of continental mass are silica and alumina (sial).
  • The oceanic crust mainly consists of silica and. Magnesium (Sima)
  • Mantle:-Just beneath the crust is the mantle.
  • It extends upto the depth of 2900 Km below the crust.
  • Core:- Innermost layer with a radius of about 3500 Km
  • Mainly made up of nickel and iron (nife , Fe= ferrous means iron).
  • Central core has very high temperature and pressure.
Rocks and minerals:-
  • Any natural mass of mineral matter that make up the earth crust is called rock.
  • It can be of different colours, size and texture.
  • Types of rocks:- three types
  • Igneous rocks, Sedimentary rocks and metamorphic rocks.
Igneous rocks:-
  • Also called primary rocks.
  • When the molten magma cools, it becomes solid.
  • Rocks thus formed is called igneous rocks.
  • It is of two types:-
  • Intrusive rocks,
  • Extrusive rocks.
  • Extrusive igneous rocks:-
  • Lava is actually fiery red molten magma coming out from the interior of the earth on its surface
  • When this molten lava comes on the surface of the earth, it rapidly cools down and become solid.
  • The rocks formed in such a way on the crust is called  Extrusive igneous rocks
  • They have very fine grained structures.
  • Example:-basalts.
  • Deccan plateau is made up of basalt rocks.
  • Intrusive igneous rocks:-
  • Sometimes the molten magma cools down deep inside the earth crust
  • Solid rocks so formed is called intrusive igneous rocks.
  • Since they cools down slowly they forms large grains.
  • Example:- Granite.
  • Grinding stones used to prepare paste/powder of spices and grains are made up of granite.
Sedimentary rocks:-
  • Rocks roll down, cracks and hit each other and are broken down into small fragments.
  • These small particles are called segments
  • These segments are transported and deposited by wind, water etc.
  • These loose segments are Compressed and harden to forms layers of rocks. 
  • These types of rocks are called sedimentary rocks.
  • For example:- sand stones is made from grains of sands.
  • These rocks also contains fossils of plants, animals and other micro-organism that once lived on them.
Metamorphic rocks:-
  • Igneous and sedimentary rocks can change into metamorphic rocks under great heat and pressure
  • For example:-
  • Clay changes to slate
  • Limestone changes to marble.
Importance of rocks:-
  • Rocks are very useful to us.
  • Hard rocks are used to make roads, houses and building.
  • Rocks are used in many games such as seven stones (pitthoo), hopscotch(stapu), five stones (gitti)
Rock cycle:-
  • One type of rock changes to another type under certain conditions in a cyclic manner. This process of transformation of rock from one to another is called rock cycle.
  • When the molten magma cools, it solidify to becomes igneous rocks.
  • These igneous rocks are broken down into small particles that are transported and deposited to form sedimentary rocks
  • When the igneous and sedimentary rocks are subjected to heat and pressure they change into metamorphic rocks
  • The metamorphic rocks which are still under great heat and pressure melt down to form molten magma.
  • The molten magma again cools down and again cools down and solidify into igneous rocks.
Rocks are made up of minerals.
  • Minerals are naturally occurring substances which have certain physical propertiesand definite chemical composition.
  • Minerals are very important to man- kind.
  • For example:- coal, petroleum and natural gas are used as fuel.
  • Iron, aluminium, uranium, gold etc are used in industries, in medicine and in fertilizers etc.
More to know:-
  • The deepest mine in the world is in South Africa. It is about 4 Km deep .
  • In search of oil engineers have dug a hole about 6 Km deep.
  • To reach to the centre of earth , we have to dig a hole about 6000Km deep on the ocean floor.
  • The crust forms only 1% of the volume of earth, 84% consists of mantle and 15% make core.
  • The radius of earth is 6371Km.
  • Latin words :- igneous = fire; sedimentary= settle down; metamorphic= change of form.
  • Fossils:- The remains of dead plants and animals trapped in the layer of rocks is called fossils.

Friday, June 12, 2020

Class 7 Science NCERT keywords


Chapter1 Nutrition In plants
Keywords:-
1) Autotrophic :- The mode of nutrition in which organisms make food themselves from simple substances is called autotrophic Nutrition.
2) Chlorophyll:- The green pigments present in leaves to make food by the process of photosynthesis.
3) Heterotrophs:- Organism that take in food prepared by autotrophs  are called heterotrophs
4)Host:- The organism which provide food to parasites is called host.
5) Insectivorous:-insects-eating plants. Example:- pitcher plant.
6) Nutrients:- Components of food such as carbohydrates, fats,  proteins, minerals and vitamins are called nutrients.
7) Nutrition:-The mode of taking food by an organism and it's utilisation by the body.
8) Parasite:- The organism that live either in or on the host body is called parasite.
9) Photosynthesis:-
The process by which autotrophs make their own food with the help of chlorophyll, sunlight, water and carbon-di-oxide.
10) Saprotrophs:-
The organism that take nutrients from dead or decaying organic matter.
11)Saprotrophic:-Mode of nutrition in which organism take in nutrients from dead and decaying matter is called Saprotrophic nutrition.
12) Stomata:- Tiny pores present on the surface of leaves which are surrounded by guard cells.

Chapter 2:-Nutrition in animals:-
Keywords:-

1.Absorption:- The process by which digested food pass into the blood vessels in the wall of intestine.
2.Amino acids:-Proteins  break down into simple substances or molecules called amino acids.
3.Amoeba:-A microscopic single celled organism found in pond water.
4.Assimilation:- utilisation of food by the target organ is called assimilation.
Or
Process by which absorbed substances are used to build complex substances such as proteins required by body.
5.Bile:-A yellow green fluid made by liver that store in gall bladder.
6.Buccal Cavity:-Oral cavity that contains teeth , tongue and salivary glands.
7.Canine:-Large , pointed teeth just behind the incisors that are used for piercing and tearing of food.
8.Cellulose:-A type of carbohydrates digested by special bacteria present in rumans of ruminants.
9.Digestion:-Breakdown of complex components of food into simpler  substances is called digestion.
10.Egestion:-The process of removal of faecal matter through anus from time to time is called Egestion.
11.Fatty acids:-Building blocks of fat in body is called fatty acids
12.Food vacuole:-A sac like structure which trap food for storage.
13.Gall bladder:-A sac like structure which store bile.
14.Glycerol:-A colourless sweet liquid produce by breakdown of fat is called glycerol.
15.Incisor:-Teeth for cutting and biting is called incisor. They are 8 in number.
16.Ingestion:-The process of taking food into the body is called Ingestion.
17.Liver:-Largest gland of body which secrets bile juice is called Liver.
18.Milk teeth:-The first set of teeth grows during infancy and they fall off at the age of 6 to 8 years.
19.Molar:-Teeth for grinding and chewing is called Molar..They are 12
 in number.
20.Permanent teeth:-Second set of teeth that replace milk teeth.
21.Oesophagus:-Foodpipe that run along neck and chest.
22.Pancreas:-A large cream coloured gland located just below stomach.
23.Premolar:-Teeth for grinding and chewing. They are 4 in number.
24.Pseudopodia:- False feet or finger like projection seen in Amoeba to capture its prey 
25.Rumen:- Animals such as cow deer etc . quickly swallow the grass and store it in a part of stomach called rumen.
26.Ruminant:- Animals which show rumination is called Ruminant. Eg deer , cattle etc 
27.Rumination:-The process in which animals chew the cud which replaces in its mouth in small lumps is called Rumination.
28.Salivary glands:- Glands which secrets saliva.
29.Villi:- Inner wall of small intestine have thousands of finger like outgrowth is called Villi.
30.Saliva:- liquid which breakdown starch into simpler substances is called Saliva.

Chapter 3:- Fibre to fabric
KEYWORDS:-

1.COCOON:-The caterpillar completely covers itself by silk fibres and turn into pupa.
This covering is known as cocoon

2.FLEECE:-Hair of sheep or yak from which wool obtained.

3.REELING:-The process of taking out threads from the cocoon fro use as silk is called reeling of silk.

4.SCOURING:-Sheared skin is washed in tanks to remove grease, dust and dirt. This is called scouring

5.SERICULTURE:-Rearing of silkworms for obtaining silk is called sericulture.

6.SHEARING:-The fleece of sheep along with a thin layer of skin is removed from its body. This process is called shearing.

7.SILK MOTH:-A large moth with a caterpillar that spins a protective silken cocoon.

8.SILKWORM:-Worm whose caterpillar make silk fibre.

9.SORTING:-In factory , different textures of hairy skin are seperated
 .

Chapter 4: Heat
Keywords:-

Celsius scale:- A type of Scale use to measure temperature .

Conduction:-The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction.

Conductor:-The materials which allows heat to pass through them easily are called conductors.
Example:- Aluminium, Iron and copper.

Convection:- The process of transfer of heat by actual motion of matter is called convection.
It is possible only in fluids.

Insulator:- The material which donot allow heat to pass through them easily are called insulators.
Example:- Plastic and wood.

Land breeze:- At night cool air blows from land to sea in a cyclic manner. This is called land breeze.

Radiation:- The transfer of heat between separated by a distance even in vaccum is called radiation. Here no medium is required.

Sea breeze:-At day cool air blows from sea to land in a cyclic manner. This is called Sea breeze.

Temperature:- A reliable measure of the hotness of object is called temperature of that object.

Thermometer:- Device used to measure temperature is called thermometer.
It is of two types:-
Clinical thermometer
Laboratory thermometer


Chapter 5 :- Acids, Bases and Salts
Keywords:-

1.Acid:-The substances which are sour in taste and convert blue litmus paper to red in aqueous solution. Example :- lemon, Hydrochloric acid etc.

2.Acidic:-The chemical nature of acid is called acidic.

3.Base:-The substances which are bitter in taste and convert red litmus paper to blue in aqueous solution. Example:- baking soda, Soap etc.

4.Basic:-The chemical nature of base is called basic.

5.Indicator:-Substances which are used to test whether a substance is acidic or basic is called indicators. Example:- turmeric, Litmus, China rose and Phenolphthalein etc.

6.Neutral:-Substances which are neither basic nor acidic in nature are said to be neural. Example:- common salt.

7.Neutralisation:-The reaction between an acid and a base to form salt and water with the evolution of heat is called neutralisation reaction.

8.Salt:-A chemical which is formed by neutralisation reaction. It can be acidic, basic or neutral in nature.


Chapter :- 6
 Physical and chemical changes
Keywords:-

Chemical change:- Irreversible Change in which new substance is formed.

Crystallisation:-Process by which large crystals of pure substance can be formed from their solutions is called Crystallisation.

Physical changes:- Reversible Changes in which no new substance is formed

Chemical reaction:- Reaction in which new substance is formed is called chemical reaction.

Galvanisation:- A method used to protect iron from rusting by coating them with a thin layer of zinc.

Rusting:- When iron exposed to moist air for a long time acquires a coating of a brown flaky substance called rust.
 This process is called rusting of Iron
 
Chapter:- 7
Weather, Climate and Adaptation of Animals to Climate
Keywords:-

1. Adaptation:- Features and habits that help animals to adapt to their surroundings is called adaptation.

2. Climate:- The average weather pattern taken over a long time, say 25 years, is called the climate of the place.

3. Elements of weather:- The temperature, humidity, rainfall, windspeed and other factors are called elements of weather.

4. Humidity:- Amount of water vapour present in the air is called humidity.

5. Maximum temperature:-The  temperature of the day occurs generally in the afternoon is called Maximum temperature.

6. Migration:- Mass movement of animals from one place to another in search of food, shelter and mate is called migration.

7. Minimum temperature:- The  temperature of the early morning  is called minimum temperature.

8. Polar region :- Region which is covered with snow and is cold for most part of year is called polar region.

9. Tropical rainforest:- Tropical region has a rainforest  which supports variety of plants and animals . This rainforest is called tropical rainforest.

10. Tropical region:- Region which has a hot climate because of its location around the equator is called tropical region.

11. Weather:- The day to day condition of the atmosphere at a place with respect to the temperature, humidity, rainfall, wind-speed, etc., Is called the weather of that place.

Chapter: 8 
 Winds, Storms and Cyclone
Keywords:-

1. Anemometer:-
An anemometer is a device used for measuring wind speed and direction

2. Cyclone:-A cyclone is a system of winds rotating counterclockwise in the Northern Hemisphere around a low pressure center.

3. Hurricane:- In Amarican continent cyclone is called hurricane.

4. Lightening:- The occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud, accompanied by a bright flash and typically also thunder.

5. Low pressure:- A condition of the atmosphere in which the pressure is below average.

6. Monsoon wind:- Any wind that changes  direction with season. For example:-  seasonal wind of S Asia that blows from the southwest in summer, bringing heavy rains, and from the northeast in winter

7. Pressure:- It is defined as ration of force per unit area.

8. Thunderstorm:- The swift movement of the falling water droplets along with the raising air create lightning and sound. This is called thunderstorm.

9. Tornado:- A dark funnel shaped cloud that reaches from the sky to the ground is called tornado.

10. Typhoon:-In Philippines and Japan, cyclone is known as typhoon.

11.Wind flow pattern:-Wind flow pattern means that in which direction the wind is blowing. Since wind flow from high pressure region to low pressure region. so this is wind flow pattern.


Chapter 9: Soil
Keywords:-

1. Clayey:-Soil which contains greater proportion of fine particle is called sandy soil. Here percolation rate is least.

2. Humus:-Decomposers when eat upon dead plant and animal tissues, they convert them into a dark coloured substance called humus.

Presence of humus ensures that the nutrients of the dead plants and animals are released into soil

3. Loamy:- A mixture of sand , clay and slit with small amount of humans in it is called loamy soil.

4. Percolation:-Percolation is the property of absorption of water by soil.

5. Moisture:- The capacity of soil to hold water is called soil Moisture.

6. Sandy:- Soil which contains greater proportion of big particle is called sandy soil. Here percolator rate is highest.

7. Water retention:-The maximum amount of water that a given soil can retain is called field capacity or water retention capacity or simply water retention.

Chapter 10: Respiration in Organisms

Keywords:-

1. Aerobic respiration:- The breakdown of glucose with the use of oxygen is called aerobic respiration.

2. Anaerobic respiration:- The breakdown of glucose without the use of oxygen is called aerobic respiration.

3. Breathing rate:- The number of times a person breathe in a minute is termed as the breathing rate.

4. Cellular respiration:- The process of breakdown of food in the cell with the release of energy is called cellular respiration.

5. Diaphragm:- A large , muscular sheet that forms the floor of chest cavity is called diaphragm.

6. Inhalation:- The taking in of air rich in oxygen into the body is called inhalation.

7. Gills:-a respiratory organ found in many aquatic organisms that extracts dissolved oxygen from water and excretes carbon dioxide

8. Lungs:- A pair of breathing organs located with the chest which remove carbon dioxide and bring oxygen to the blood. There is a right and a left lung.

9. Exhalation:- Giving our of air rich in carbon dioxide is known as exhalation.

10. Spiracles:-  Insects such as cockroach has small openings on the sides of its body. These openings are called spiracles.

11. Tracheae:- A network of air tubes that insects have for gaseous exchange  is called tracheae.

12. Ribs:- These are the long curved bones which form the rib cage which protect heart and lungs.


Chapter 11: Transportation in Animals and Plants
Keywords:-

1. Ammonia:- Nitrogenous wastes product which is excreted by aquatic animals.

2. Artery:- Blood vessels which carries oxygen rich blood from the heart to all parts of the body are called arteries. Exception = pulmonary artery.

3. Blood:- A fluid connective tissue which flows in blood vessels and transport food and oxygen to different parts of body. It also transport waste for removal from the body.

4. Blood vessels:- Pipe like structure through which blood passes from one part of body to another . It is of two types :- arteries and veins.

5. Capillary:- On reaching the tissue, veins divide into extremely thin tubes . These tubes are called capillaries.

6. Circulatory system:- A system which consist of heart, blood vessels and blood and together transport food , oxygen , carbon dioxide etc to the body.

7. Dialysis:- Process by which blood of the body filtered periodically through artificial kidney is called dialysis.

8. Excretion:- The biological process of removal of harmful nitrogenous wastes from the body is called excretion.

9. Excretory system:- A system which consist of a pair of kidney, a pair of ureter, a urinary bladder and a urethra which together help to remove harmful wastes from the body is called excretory system.

10. Haemoglobin:- An pigment present in  red blood cells which provide red colour to it. It also binds with oxygen and transports it to all the cells.

11. Heart beat:- The heart contract and relax rhythmically . This is called heart heart beat.

12. Kidneys:- An organ which filter the blood into useful and harmful substances by the blood capillaries is called kidney. 

13. Phloem:- Vascular Tissue which transport food from leaves to other parts of plant.

14. Plasma:- Yellow colour Fluid in which RBCs, WBCs and platelets present . 

15. Platelets:- Cells which stops bleeding and make dark red clot after getting cut.

16. Pulse:- the throbbing sound of blood flowing in the arteries is called pulse .

17. Red blood cell:- Cells which contain haemoglobin and so red in colour.

18. Root hair:- thread like structure present on roots of plants which increases the surface area of root for absorption of water and minerals dissolve in water.

19. Stethoscope:-  A device which helps to feel heartbeat.

20. Sweat:- An excretory waste which our body produce during summer to regulate the its temperature. It contains salt and water.

21. Tissue :- A group of cells which have common origin and perform similar function.

22. Urea:- Nitrogenous wastes product which is excreted by mammals, adult amphibians and reptiles etc.

23. Ureter:- A pair of tubes which transport urine from kidney to urinary bladder.

24. Urethra:- Tube  which passes  urine outside the body through urinary opening.

25. Uric acid:- Nitrogenous wastes product which is excreted by insects , birds etc.

26. Urinary bladder:- A muscular sac like structure which temporory store urine .

27. Vein:- Blood vessel which carries carbon dioxide rich blood from different parts of body to lungs . Except = pulmonary vein.

28. White blood cell:- Blood cells which fight against germd that may enter our body.

29. Xylem :- Vascular tissue which transport water and nutrients from root to other parts of plants .


Chapter 12: Reproduction in Plants
Keywords:-

1. Asexual reproduction:- Mode of Reproduction in which single parent produce identical offsprings called clone.

2. Budding:- A mode of asexual reproduction in which a bud is arise at parent body which grow and detach to produce new offspring.

3. Embryo:- Zygote divide and redivide to produce a ball like structure called embryo which later form baby.

4. Fertilization:- The fusion of male and female gamete to form zygote is called fertilization.

5. Fragmentation:- Mode of asexual reproduction in which Alga breaks up into two or more fragments and each fragment grow into new individual.

6. Gametes:- Haploid Reproductive bodies which fuses together to form zygote in sexual reproduction.

7. Hypha:- A thread like structure seen in fungus on which spores containing sporangium attached .

8. Ovule:- Female gamete in flower which turns into seed after fusion with pollen grain.

9. Pollen grain:- male gamete with is produce in Anther of flowers.

10. Pollen tube:- pollen grain reaches to ovule through a tube like structure. This tube is called pollen tube.

11. Pollination:- The process of transfer of pollen grains from the anther of one flower to the stigma of the same or another flower.

12. Seed dispersal:- Spreading of seeds away from the mother plant is called seed dispersal.

13. Sexual reproduction:- A mode of Reproduction in which two parents involved to produce offspring of similar kinds. Example:- human beings.

14. Spore:- Asexual reproductive bodies which germinate and developes into a new individual. It is seen in fungus, fern and mosses.

15. Sporangium:- A sac like structure  which is present on the hyphae and  contains spores .

16. Vegetative propagation:- A mode of asexual reproduction in which new plants are produced from different vegetative parts such as leaves, stems and roots.

17. Zygote :- The fertilized egg is called zygote.

Chapter:- 13 
motion and time 
Keywords:-

1. Bar graph:-A diagram that uses narrow bands of different heights to show different amounts so that they can be compared

2. Graphs:- Diagram that shows relation between variable quantities.

3. Non-uniform motion:- A body is said to be in non-uniform motion if it covered unequal distance in equal intervals of time.

4. Oscillation:- The process in which an object shows to and fro movement.

5. Simple pendulum:- A device which shows oscillatory motion.

6. Speed:- Rate at which an object covers distance is called speed.
Speed = total distance / total time taken

7. Time period:- The time taken by pendulum to complete one oscillation is called time period.

8. Uniform motion:-A body is said to be in uniform motion if it covered equal distance in equal intervals of time.

9. Unit of time:- unit in which time can be measured. It can be second, min, hour etc.


Chapter 14: Electric current and its effects
Keywords:-

1. Battery :-  A combination of two or more cells is called battery.

2. Electric bell :- An electric bell is a mechanical or electronic bell that functions by means of an electromagnet.

3. Heating effect of current :- Production of heat when electric current passes through a material.

4. Circuit diagram :- Pictorial representation of ab electronic circuit that is drawn using conventional symbols of different circuit elements.

5. Electromagnet :- A current carrying coil of an insulated wire wrapped around a piece of iron is called electromagnet.

6. Magnetic effect of current :- A current carrying wire behave as a magnet and produce magnetic field. This property is called magnetic effect of current 

7. Electric components :- Devices which when combine together in a systematic pattern forms electric circuit are called electric components.

8. Fuse :- Safety device which prevent excessive flow of current through a circuit.

Chapter: 15
Light 
Keywords :-

1. Concave lens:- Diverging lens which is thinner at the middle and thicker at the ends.

2. Concave mirror:- Converging lens  whose reflecting surface is curved inward.

3. Convex lens:- Converging lens which is thinner at the ends and thicker at the middle.

4. Convex mirror:- Diverging mirror whose reflecting surface is curved outward.

5. Erect image :- An upright image of an object is called erect image.

6. Magnified image:- Enlarged image formed by Convex  lens Magnifying glass is Called Magnified image.

7. Magnifying glass:- Convex lens which make enlarge image of object. 

8. Prism :- Transparent element with three rectangular and two triangular surfaces is called prism.

9. Rainbow :- A band of seven colours seen as a large arc in the sky . It is generally seen after rain. The seven colours in band are Violet, Indigo, Blue, Green, Yellow, Orange and Red.

10. Real image:- Image formed when reflecting rays actually meet. It is formed on a screen.

11. Rear view mirror:- A mirror in which the driver can see the traffic behind while driving.( Inside car)

12. Side mirror :- Convex mirror which are used in automobiles and help the drivers to see the traffic behind them.(Beside car)

13. Spherical mirror:- Mirror having spherical reflecting surfaces are called spherical mirror.

14.Virtual image:- Image formed when reflecting rays appear to meet. It can't be formed on a screen.

Chapter 16:- Water: A previous resource
Keywords:-

1. Aquifer:- At places the ground water is stored between layers of hard rock below the water table. This is known as aquifer.

2. Groundwater:- The water found below the water table is called ground water.

3. Water harvesting:- The use of rain water to recharge the groundwater is called Water harvesting or rainwater harvesting.

4. Depletion:-  Decrease level of water table by no replenishment by natural processes is called depletion of water table.

5. Infiltration:- The rainwater and water from other sources such as rivers and ponds seeps through the soil and fills the empty spaces and cracks deep below the ground. 
The process of seeping of water into the ground is called infiltration.

6. Water table:- level below the ground beyond which ground is saturated with sufficient water.

7. Drip irrigation:- A technique of watering plants by making use of narrow tubings which deliver water directly at the base of the plant.

8. Recharge:- process by which water moves downward from surface water to groundwater


Chapter 17:- Forests: Our Lifeline
Keyword:-

1.canopy:-It is the structure formed by collection of individual plant crowns of a plant community

2.Crown:-The branchy part of a tree above the stem is called as crown

3.Decomposers:-Organisation which feed on dead bodies of plants and animals. 
Or
Micro-organism which convert the dead plants and animals to humus.
•E.g. bacteria, fungi.
•Live in soil

4.Deforestation:-permanent destruction or conversion of forest areas for other purposes.

5.Humus:-Decomposers when eat upon dead plant and animal tissues, they convert them into a dark coloured substance called humus.
Presence of humus ensures that the nutrients of the dead plants and animals are released into soil

6.Regeneration:-Process of formation of new plant from old one.

7.Seed dispersal:-Seed dispersal is the movement, spread or transport of seeds away from the parent plant.

8.Soil erosion:-The removal of top fertile layer is called soil erosion.

9.Understorey:-Plant layers growing beneath the forest canopy.
•Forest understory receive less intense light than the forest canopy

Chapter 18:- waterwaste story
Keyword:-

1.Aeration:- Process by which air is pumped into the clarified water to help aerobic bacteria to grow is called aeration.

 2.Aerobic bacteria:-bacteria which decompose the organic matter in the absence of air.

3.Anaerobic bacteria:- bacteria which decompose the organic matter in the absence of air.

4.Biogas:- Gobar gas formed when anaerobic bacteria decompose sludge in anaerobic sludge digestion.

5.Contaminant:- Undesirable substances present in the water such as nutrients, microbes etc is called contaminant.

6.Sanitation:- Sanitation refers to public health conditions related to clean drinking water and adequate treatment and disposal of human excreta and sewage


7.Sewage:-
  •  Liquid waste which contain pollutents that has to be removed from a community for healthy living.
  • It causes water and soil pollution.

8.Sewer:- big and small pipes which together form sewerage are called sewers.

9.Sewerage:- Network of big and small pipes forms a drainage system called sewerage.

10.Sludge:- solids like faeces settle at  the bottom of clarifier and are removed with a scraper is called sludge.

11.Wastewater:- Water contaminated with harmful and undesirable substances such as chemicals, oils, paints, excreta etc. 
It contain foul smell and colour.


Thursday, June 4, 2020

Class 9 Is matter around us pure?

Topics to be covered:-
  • Introduction
  • Pure matter
  • Impure Matter
  • Homogeneous mixture
  • Heterogeneous mixture
  • Physical and chemical change
  • Tyndall effect
  • Solution, suspension and colloids
  • Types of Solution
  • Properties of solution
  • Terms related to solution
  • Suspension
  • Colloids
  • Seperation of mixture
  • Assignment

#Matter:-
•Anything that occupied some space and have some mass us called matter.
•It may be 
 -solid
 -liquid
 -gas
Types of matter:-
Two types
1. Pure matter
2. Impure substance
*Pure matter:-
It is defined as material which contains only one kind of atoms or molecules.
Types of pure matter:-
Two types
 -Elements
 - Compounds
Elements:-
•Pure substance which are made up of only one kind of atoms are known as elements.
•All atoms in the element are identical.
• Atoms of different elements are different.
#Classification of Elements:-
 -Metals
 - Non-metals
 - Metalloids
• Mercury and bromine are liquid at room temperature.
•Cesium and Gallium are solid at room temperature but change into liquid when temperature increases.
#Properties of Metals:-
  • Luster
  • Good conductor of heat and electricity
  • Malleable i.e. they can be beaten into thin sheets.
  • Ductile i.e. they can be drawn into thin wire.
  • Sonorous i.e. produce popup sound.
  • Generally, silvery grey or golden yellow colour.
  • Example:- Gold(Au), silver(Ag), sodium (Na), potassium (K), etc.
#Properties of Non-metal:-
  • Do not have luster.
  • Bad conductor of heat and electricity.
  • Non-malleable
  • Non-ductile
  • Non-sonorous
  • Display variety of colours
  • Ex:- Carbon(C), Nitrogen (N), Oxygen (O) etc.
#Metalloids:-
•They are those elements which have properties of both metals and non- metals.
•Ex:- Germanium, Boron, Silicon, etc.
2. Compounds:-
Pure substance which are made up of only one kind of molecules are known as compound.
•Atoms consisting are from two or more different elements.
•The different elements are combined in fixed proportion in a compound.
#Properties of compounds:-
  • A compound is a homogeneous substance.
  • It has definite composition
  • Definite melting point and boiling point.
  • Properties of compounds are different from its constituents.
  • The constituents of compound cannot be seperated by simple physical process.
  • The constitution can be seperated by chemical or electrochemical reactions.
*Impure matter:-
•A mixture is a material which contains two or more different kinds of particles(atoms or molecules) which donot react chemically but are physically mixed together in any proportion.
•Types:- Two
 1. Homogeneous mixture
 2. Heterogeneous mixture

# Homogeneous mixture:-
  •  Mixture is said to be homogeneous if all the components of the mixture are uniformly mixed.
  • No boundaries of seperation between them.
  • Ex:- Salt in water etc.
#Heterogenous mixture:-
  • A mixture is said to be heterogeneous if all the components of mixture are not uniformly mixed 
  • Visible boundaries of seperation between them
  • Example:- sand in water etc.
#Properties of mixture:-
  •  A mixture may be homogeneous or heterogeneous.
  • The composition of mixture is variable.
  • Donot have definite melting point and boiling point.
  • Properties of mixture are the properties of its constituents.
  • Constituents of mixture can be seperated by simple physical methods.
* Physical and chemical change:-
Physical change:
  • It brings change in physical properties such as physical states, shape, size etc.
  • No change in chemical composition of a substance.
  • No new. Produce formed.
  • It is reversible and temporary
Chemical change :-
  • It brings change in chemical properties.
  • There is always a change in. Chemical composition of a substance during chemical change
  • A new product is formed.
  • It is irreversible and permanent.
*Tyndall effect:-
• If a light is passes through medium and it's  path can be seen , then the substance is said to show Tyndall effect.
•Example:- When a beam of sunlight enters a dark room through some hole in window, path of light become visible.
• This is due to scattering of light by the colloidal dust particles present in air 
• This is known as Tyndall effect.

#Solution, suspension and colloids:-
•A solution is defined as a homogeneous mixture of two or more chemically non-reacting substances whose concentration can be varied within limits.
•A solution has two components:-
1. Solute:- 
  • A component which is dissolved or which is present in small amount is called solute.
  • Also called dispersive phase.
2. Solvent:-
  • A component which is present in large amount is called solvent.
  • Also called dispersive medium.
# Types of solutions:-
1. Solid in liquid:
  • Sugar in water
  • Tincture of iodide(iodide dissolved in alcohol) etc.
2. Liquid in liquid:-
  • Alcohol in water
3. Gas in liquid:-
  • Carbon-di-oxide in water.
  • Dissolved Oxygen in water.
4.Solid in Solid:-
  • Alloys
  • Brass(copper+zinc)
  • Bronze(copper+tin)
5. Gas in Gas:-
  • Air
6. Liquid in solid:-
  • Copper sulphate in dental amalgam
7.Gas in Solid:-
  • Gas is absorbed over the surface of metal.
8.Solid in Gas:-
  • Camphor in air.
9.liquid in Gas:-
  • Cloud and fog.
#Properties of Solutions:-
  • Homogeneous mixture
  • Size of particles is less than 1 nm
  • Particles cannot be seen by naked eyes.
  • Does not scatter light i.e. it donot show Tyndall effect.
  • It is a stable mixture, solute does not settled down over a period of time.
  • Solute and solvent do not scatter by filtration.
*Terms related to solution:-
1. Dilute and concentrated solution:
  • A solution having a small amount of solute in a given solvent is called dilute solution.
  • A solution having a large amount of solute in a given solvent is called concentrated solution.
  • Both are relative terms.
2. Unsaturated and saturated solution:-
  • A solution that can dissolve more solute in it at a given temperature is called unsaturated solution.
  • A solution which contain maximum amount of solute dissolved in given quantity of solvent at a given temperature and which cannot dissolve any more solute at that temperature.
3. Solubility:-
•The maximum amount of that can be dissolved in 100mL of solvent is called Solubility of solute in that solvent at a particular temperature.
Or
•Amount of solute needed to make saturated solution of 100gm of solvent is called Solubility of solute in that solvent at a particular temperature.

4. Effect of temperature and pressure on solubility:-
(a) Solubility of solid solute in liquid:-
As temperature increases, 
  • Solubility also increase.(Pressure has no effect on Solubility).
  • Saturated solution become unsaturated.
  • If saturated solution is cooled down some dissolved solute separates.
(b) Solubility of gas in liquid:-
  • As temperature increases, solubility decreases,
  • As the pressure increases, the solubility increases.
This is the reason that cold drinks are packed at high pressure.
(6). Concentratration of Solution:-
(a) Solid in liquid:-
Concentratration=
            Mass of solute *100   
            Mass of solution
(b) Liquid in liquid=
       Volume of solute *100
        Volume of solution
(c) mass by volume=
       Mass of solute*100
       Volume of solution

#Concentration is the measure of amount.
•It is the amount of solute present in amount of Solution.

#Suspension:-
It is a heterogeneous mixture in which the solute particles donot dissolve but remain suspended throughout the bulk of medium.

#Properties of Suspension:-
  • It is a heterogeneous mixture.
  • Size of particles is greater than 100nm.
  • Particles can be seen by naked eyes.
  • It is unstable mixture. Solute settle down at the bottom over period of time.
  • If the solution is passed through filter paper, solute and solvent gets seperated.
  • It scattered light when light is passes through the solution i.e. it show Tyndall effect.
*Colloids:-
   •Solution in which the size of particles lies in between those of true solutions and suspension are called colloidal Solution or simply colloids.

# Properties of colloids:-
  • It is a heterogeneous mixture.
  • Size of particles is smaller than suspension but greater than solution.
  • Particles donot settle down at the bottom over a period of. So It is a stable mixture.
  • It scatter a beam of light passing through it. So it shows Tyndall effect.
  • Solute and solvent cannot be separated by filtration.
  • Common examples of colloids are :-
*Separation of mixtures:-
The method to be used  for separating mixture depends on the nature of its constituents.
(1) Evaporation
  • This process is used to separate a substance that has dissolved in liquid.
  • It is based on the fact that liquid vaporized easily whereas solid donot vaporized easily.
  • Used to get dye from ink. (Dye+water).
Note:- liquid get evaporate and lost to air. So liquid cannot be recovered by this method.
(2). Centrifugation:-
  • Method is used to separate suspended particles of a substance from liquid in which mixture is rotated at high speed in a centrifuge.
  • As the mixture rotates rapidly,a force acts on heavier suspended particles and bring them down to the bottom.
  • The clear liquid being lighter remains on the top.
Application:-
  • Used to separate cream from milk.
  • Diagnose blood and urine test.
  • Also used in washing machine.
(3). Seperation of two immiscible liquid:-
  • This process is used to separate two liquids which donot mix into one another.
  • Seperated through seperated funnal.
Principle:-
•Two immiscible liquids seperate out in layers depending on their densities.
Method:-
  •  Separating funnel has a stopcock in its stem to allow flow of liquid from it or to stop the flow of liquid from it.
  • Seperation of two immiscible liquid depends on difference in their densities.
  • Example:- seperation of kerosene oil and water /oil and water.
  • Kerosene oil is less denser so settles at top of water.
  • Used to extract iron from ore.
(4) Seperation of miscible liquids/Distillation:-
  • This process is used to separate two liquids which are miscible i.e. they mix into each other in all proportions and form a single layer when put in container.
  • This method is valid when difference in boiling points of two liquids is more than 25K.
Method:- 
  • Heat the mixture till one of the liquid to attain it's boiling point and form vapours.
  • Then cool the vapour back to liquid in another breakee.
  • The liquid obtained by condensing the vapour is called distillate.
(5). Fractional Distillation:-
  • When the difference in boiling point of two miscible liquids is less than 25K , then fractional Distillation is used to separate the liquids.
  • In this process, a fractionating column is fitted between distillation flask and container.
  • A single fractionating column has glass beads . These beads provide surface for vapour to cool and condense rapidly.
Uses:-
  •  It is used to separate petroleum products.
  • Use to seperate gases from air.
#Seperation of gases from air:-
  • Air is a homogeneous mixture of gases and can be separated into its components by fractional distillation.
  • The flow chart show the steps of process:-
  • Air--->
  • compress and cooled by increasing pressure and decrease temperature---> 
  • liquid air---->
  • allow to warm up slowly in fractional distillation column--->
  • Gases get separated at different height.
(6) Sublimation:-
  • The change of solid directly into vapours and of vapour into solid on cooling is called sublimation.
  • The solid which undergoes sublimation is called sublime.
  • The solid which obtained by cooling the vapour is called sublimate.
  • Example:- Ammonium chloride, camphor, naphthalene and anthracene.
(7). Chromatography:-
  • Technique used to separate those solute that dissolve in same solvent in very small quantities.
  • Most common chromatography is paper Chromatography.
Principle:- The seperation is based on the fact that two or more substances are soluble in same solvent but their Solubility may be different.

Uses:-
  • Use to separate components of dye from ink 
  • Drugs from blood.
  • Pigments from natural colours.
(8). Crystallization:-
  • Use to purify solid.
  • It is a process that seperates a pure solid in the form of its crystals from solution.
  • Example:- getting NaCl from sea water.
  • Seperation of crystals of Alum from impure samples.
(9). Cleaning water for Drinking purpose:-
To have clean water ,we need to pass water obtained from Lake through a long process:-
  • Sedimentation tank:- Heavy impure particles settle down when is left for some time.
  • Loading tank:- Alum is mixed with water even small suspended particles settle down.
  • Filteration tank:- It has three layers of find sand, coarse sand tiny stones . When water passes through it , it further cleaned.
  • Chlorination tank:- Chlorine is mixed with water in the tank. It lol germs. Now water is sent to home.
(10). Filteration:-
  • A process in which solute and solvent are seperated using filter paper.
  • The substance which is not soluble and remain on the filter paper is called residue.
  • The substance which filtered out is called filtrate.
Assignment:-
(1). Make a flow chart for classification of matter.
(2).Write the properties of Metal, Non-metal, metalloids, Compounds, mixture, solution, suspension and colloids.
(3)Write the types of Solution with example.
(4) Differentiate between
  • Homogeneous vs heterogeneous mixture
  • Physical change vs chemical change
  • Solution, suspension and colloids
(5). Explain Tyndall effect.
(6). Define:- solute, solvent, dilute and concentrated solution, unsaturated and saturated solution, solubility.
(7). Discuss the effect of pressure and temperature on solubility.
(8) Briefly describe the method of seperation of mixture.

Thankyou :-)

Monday, June 1, 2020

Class 7 "our environment" notes

Target audience:- class 7 CBSE students
Topics to be covered:-
1.Introduction
2.What is environment?
3.Natural environment.
4. Hydrosphere
5. Atmosphere
6. Biosphere
7. Ecosystem
8.Human resources
 *What is environment?
What ever you see in the surroundings. Eg. School building, chair tables 
2. Objects created by nature:-mountains,rivers,trees, animals
3.Objects created by man:-roads,cars, clothes,books.
3Why Is our environment changing? 
•It is because of our needs. They are increasing day by day; we are therefore modifying and attempts even destroying. Our natural surroundings.  

Ques:- Write a short note on environment?
  • Ans:-Environment is our basic life support system.
  • It provides the air we breathe, the water we drink the food we eat and the land where we live.
  • How do humans modify this environment?
  • The car fumes pollute the air,water is collected in a pot,food is served In vessel and land is used to build factories
  • Humanbeings make cars. Mills ,factories,and manufacture containers. This is how human beings modify natural environment.
*Exact definition:-
  • Environment:- The place , people,things, and nature that surrounds any living organism is called environment.
  • It is a combination of natural and human made phenomena
  • Natural environment refers to both biotic and abiotic Conditions .
  • Biotic:- the world of living organisms.e.g.plants and animals.
  • Abiotic:- The world of nonliving elements. Eg.lands

Natural environment:-
  • Land , water ,air, plants and animals comprises the natural environment.
  • Lithosphere:-Solid crust or hard top layer of the earth.
  • Made up of rocks and minerals
  • Covered by a thin layer of soil
  • Irregular surfaces with various landforms such as mountain, plateaus, plains, valleys , etc 
  • Landforms are found over the continents and Alos on ocean floors.
  • Provide forests, grasslands for grazing land for agriculture and human Settlements. 
  • Source of mineral wealth.
Hydrosphere:- Domain of water. Comprises Various sources of water and different types of water bodies like rivers ,lakes seas , oceans etc. Essential for all living beings.
Atmosphere:- 
  • Thin layer of air that surrounds the earth.
  • Gravitational force of earth holds the atmosphere around it.
  • It protects us from the harmful rays and scorching heat of the sun.
  • It consists of a number of gases, dust and water vapour.
  • The change in atmosphere produce changes in weather and climate.
Biosphere:- plant and animal kingdom together make biosphere or the living world. Narrow zone of the earth where land water and air interact with each other to support life.
Ecosystem:- It is a system Formed by interaction of all living organisms with each other and with the physical and  chemical factors of the environment in which they  live, all linked by transfer of energy and material.

All plants , Animals and human beings depends upon their immediate surroundings. They are interdependent on each other. This relationship between living organisms aa well as the organisms and their surroundings forms an ecosystem. Few examples of ecosystems are :- large rainforest, grasslands , desert , lake , river, oceans, mountain and small ponds etc.

World Environment Day:- 5 June
Barter system:- Trade in which goods are exchange without the use of money.
Human resources:- Human being interact with environment and modify it according to their needs. Early humans adept themselves to the natural surroundings. They led a simple life and fulfilled their requirements from the nature around them.

With time , needs grew and became more varied. Humans learns to grow crops, domesticate animals and Lead a settled life. Wheel invented, barter system emerged, trades started and commerce developed. Industrial Revolution emerges large scale production. Transportation become faster, information revolution made communication easier and speedy across the world.

Thankyou :-)



Class 7 civics notes

Chapter 1:- On equality 

Topics to be covered:-
1. Introduction
2.Equal right to vote
3.Other kinds of equality
4.Recognising dignity
5.Equality in Indian democracy.
6.Issues of equality in other democracies
7.Challenges of democracy
INTRODUCTION:-
•India is a democratic country.
•It include people's participation, the resolution of conflict, and equality and justice.
•Equality is a key feature of democracy and influences all aspects of its functioning.
•so equality is a condition in which adequate opportunities are given to all. It is the soul of Indian democracy.
EQUAL RIGHT TO VOTE:-
•In a democratic country,like India , adults , irrespective of their religion, caste , education etc. are allowed to vote . This is called universal adult franchise.
OTHER KINDS OF EQUALITY:-
•Does equality exist?
-In reality, a difference exist between rich and poor.
-The caste system is also rigid.
-Dalits in India and the minorities are denied the right to dignity and equality.
•Dalit is a term that the so called lower castes use to address themselves. Dalit means 'broken'.
• Omprakash Valmiki is a famous Dalit writer. He wrote "Joothan".
EQUALITY IN INDIAN DEMOCRACY:-
•The Indian Constitution recognise every person as equal. This is not to say that inequality ceases to exist.
•This recognition of equality includes some of the following provisions in the constitution:-
First:-Every person is equal before the law.
Second:-No person can be discriminated against on the basis of their religion, race, caste, place of birth etc.
Third:- Every person has access to all public places including playgrounds, hotels, shops and markets.
Fourth:- untouchability has been abolished.
How has government tried to implement equality?
•Two ways
First :- through laws
Second:-through government programmes
•Tamil Nadu was the first state in India to start midday meal scheme(2001).
*Positive effects of scheme:-
-Help to reduce caste prejudices
-Dalit women have been employed to cook the meal.
-Help to reduce hunger of poor students
-more and more students get enrolled in schools for education.
ISSUE OF EQUALITY IN OTHER DEMOCRACIES:-
•In United States of America,the African-Americans continue to describe their lives today as largely unequal.
Rosa Parks , an African-American women, changed the course of American history with one defiant act.
•The Civil Rights Act of 1964 prohibited discrimination on the basis of race, religion or national origin.
CHALLENGE OF DEMOCRACY:-
•No country can be described as being completely democratic.
GLOSSARY:-
1.Universal adult franchise:-
This is a very important aspect of democratic societies. It means that all adults (above 18) citizens have the right to vote irrespective of their social or economic backgrounds.
2. Dignity:-
This refers to thinking of oneself and other persons as worth of respect.
3. Constitution:- This is a document that lays down the basic rules and regulations for people and the government in the country to follow.
4. Civil Rights Movement:-
A movement that began in USA in 1950s in which African-American people demanded equal rights and an end to racial discrimination.
MORE TO KNOW:-
Excerpt from Article 15 of the Indian Constitution:-
1. The state shall not discriminate against any citizen on grounds only of religion, race, caste, sex, place of birth or any of them
2. No citizen shall ,on grounds only of religion, race , caste , sex ,place of birth or any of them , be subject to any disability, liability, restriction or condition with regard to -
(a) access to shops, public restraunts, hotels and places of public entertainment;
Or
(b) the use of wells , tanks , bathing ghats, roads and places of public resort maintained wholly or partly our of state funds or dedicated to the use of general public.

Chapter 2:- Role of government in health

What is Health?
  • Health means our ability to remain free of illness and injuries. There are certain factors which affect our health.
Healthcare in India
  • India has the largest number of medical colleges in the world and is among the largest producer of doctors.
  • India is the fourth largest producer of medicines in the world.
  • Most doctors settle in urban areas, while people in rural areas have to travel long distance for medical facilities.
  • About 5 lakh people die from tuberculosis every year, while 2 million cases of malaria are reported every year.
  • In India, a paradoxical situation exists as health care resources are uneven.
Private and Public Healthcare
  • Healthcare is divided into two categories: Public health services and private health services.
  • Public health services is a chain of health centres and hospitals run by the government. One important aspect of public health is that it is meant to provide quality healthcare services either free or at a low cost so that even the poor can seek treatment. It is available in both the rural and urban areas.
  • Private health services are not owned or controlled by the government. People have to pay a lot of money for every service that they use.
Healthcare and Equality

In India, private health services are increasing but public health services are not. As the cost of these private services is high, many people cannot afford them.

Private services sometimes encourage practice which is unethical. Barely 20% of the Indian population can afford medicines that they require during an illness.

It is the responsibility of the government to provide quality healthcare services to all its citizens, especially the poor and the disadvantaged.

In 1996, Kerala decentralized its health budget at Panchayati level to ensure effective health planning.

The best example of healthcare comes from Costa Rica where the government provides for adequate healthcare to people.

In a democratic country, it is the expectation of the people that government work for their welfare through the provision of education, health, employment, etc.

Health is a vital aspect because only healthy people can prove themselves resourceful.

Health means our ability to remain free of illness and injuries. In broader sense, health means something more than this. Apart from disease, we need to think of other factors such as clean drinking water, pollution-free surroundings etc. that affect our health. Adequate food is also essential for keeping ourselves in good health.

A life with stress will lead us to illness. Hence we need to be without mental strain. Thus, good health includes both a sound mind and sound body.

We need proper healthcare facilities to maintain good health.

Healthcare facilities include health centres, hospitals, laboratories for test, ambulance services, blood banks, etc.

In order to run such facilities, we need health workers, nurses, qualified doctors, etc.

We also need medicines and equipment that are essential for treating patients.

India has no dearth of qualified doctors. There are a large number of clinics and hospitals too. Perhaps, therefore, a large number of medical tourists come to our country for treatment at a reasonable cost.

India is the fourth largest producer of medicines in the world and is also a large exporter of medicines. Despite all this, the health situation in our country is very poor. The reason is that the government fails to make necessary healthcare available to all.

Healthcare facilities can be divided into two categories—Public health services and Private health facilities.

The public health service is a chain of health centres and hospitals run by the government. It is found in both the rural and urban areas.

At the village level, there are health centres where there is usually a nurse and a village health worker. They deal with common illnesses.

At the district level is the District Hospital that supervises all the health centres.

Big cities have many government hospitals.

Under the public health system, quality health care services are provided either free or at a low cost, so that even the poor can seek treatment.

Under this system, the action is also taken to prevent the spread of diseases like Tuberculosis, malaria, jaundice, cholera, diarrhoea, chikungunya, etc.

A wide range of private health facilities exists in our country. A large number of doctors run their own private clinics.

In the rural areas, Registered Medical Practitioners (RMPs) are found whereas in the urban areas a large number of doctors can be seen.

There are hospitals and nursing homes that are privately owned, and not run by the government.

Unlike public health services in private hospitals, patients have to pay a lot of money for their treatment.

In our country, private services are increasing but public sen/ices are not. As the private sen/ices are run for profit, the cost of these services is rather high. Poor people find it difficult to get treatment here.

Adequate healthcare is not available to all in the country. Only 20% of the population can afford all the medicines that they require during illness.

It has been found that 40% of people who are admitted to a hospital for some illness have to borrow money or sell some of their possessions to pay for the expenses.

For the poor, every illness is a curse. As they are undernourished and live in unhygienic conditions they frequently fall ill. The expenses on illness make their situation even worse.

So far women’s health is associated, it is easily ignored.

Many tribal areas have few health centres.

Thus, we can say without a doubt that the health situation of most people in our country is not good.

However, Kerala has made efforts to provide adequate healthcare to people of the state.

Costa Rica is a country in North America. It is considered to be one of the healthiest countries in the continent.

The Costa Rican government curtailed the expenses on the army to spend it on health, education and other basic needs of the people. It provides them with safe drinking water, sanitation, nutrition and housing.

Medical Tourists: The foreigners who come to our country for medical treatment at hospitals that change the reasonable cost.

Communicable Diseases: Diseases that spread from one person to another through water, food, air, etc.

Public: A service that is meant for all people in the country and is organised by the government. For example, schools, hospitals, etc.

Private: A service that is organised by an individual or company for their own profit.

OPD: It refers to the Out Patient Department. This is where people are first brought in and treated in a hospital without bwithouing admitted to any special ward.

RMPs: It refers to Registered Medical Practitioners. They are found in rural areas.

Chapter 3 :- How the state government works

  • Government works at three levels- national, state and local.
  • In states, it is the MLA (Member of Legislature Assembly) who represents the people. The MLAs enter the assembly and form the government.
  • Every MLA is elected from one area. This area is known as his constituency.
  • Every state in India has legislative assembly.
  • Each state is divided into different constituency.
  • For example:- Himachal Pradesh is divided into 68 assembly constituency.
  • From.each constituency , people elect one representative who then become MLA
  • A political party whose MLA’s win more than half the number of constituencies in the state get the majority. The political party is called the ruling party.
  • All the other members are called opposition.


Working of the Government
  • The organization of the state government includes the Governors, the state legislature and the state council of ministers.
  • Every state in India has a Legislative Assembly and duration of the Legislative Assembly is five years.
  • The head of the state is the Governor while the head of the government consists of the council of ministers headed by the Chief Minister.
  • The leader of the ruling party who forms the government is the Chief Minister.
  • The Legislative Assembly is a place where leaders debate and discuss on important issues and make important bills.
  • In addition to the Legislative Assembly, the press conference is also a mode of knowing what the government does for the people.
  • The government works through various departments like public works department, agriculture, health and education.
  • The government has the power to make new laws for the state regarding health and sanitation.
  • Laws for the state are made by the state Legislative Assembly.
  • Laws for the country are made by the Union Parliament.
  • An MLA is a member of the Legislative Assembly. He is elected by the people. In this way, he represents people.
  • Every state in India has a Legislative Assembly.
  • Each state is divided into constituencies.
  • A constituency is an area from which all the voters living there choose their representatives, who then become Members of the Legislative Assembly (MLAs).
  • These MLAs belong to different political parties.
  • A political party whose MLAs have won more than half the number of constituencies, a state can be said to be in a majority.
  • The political party that has a majority becomes the ruling party and all other members become the opposition.
  • After the elections, the MLAs belonging to the ruling party elect their leader who becomes the Chief Minister. The Chief Minister then selects other people as ministers.
  • The Governor of the state appoints the Chief Minister and other ministers.
  • The ministers have separate offices.
  • Some MLAs have dual responsibilities—one as an MLA and the other as a minister.
  • The debate is generally held in the Assembly to discuss current problems. During debate time MLAs can express their opinions and ask questions related to the issue or give suggestions about what should be done by the government. The minister then replies to the questions and assures the Assembly that adequate steps are being taken.
  • The Chief Minister and other ministers together are responsible to run the government.
  • The word ‘government’, refers to government departments and various ministers who head them.
  • All the MLAs who gather together in the legislative assembly are called the Legislature.
  • The Legislature Assembly is not the only place where opinions are expressed about the work of the government. There several newspapers, TV channels, and other organizations which also talk about the government.
  • After the discussion in the assembly, a press conference is generally held by a particular minister who explains the steps taken by the government. Media persons then report these discussions in several newspapers.
  • The government can also decide to make new laws for the state regarding sanitation and health facilities. The various government departments then implement these laws.
  • Whenever the government fails to satisfy people’s needs, they organize meetings to voice their opinions and protest against the government.
Glossary:-
Constituency: It refers to a particular area from which all the voters living there choose their representatives.

Majority: A political party whose MLAs have won more than half the number of constituencies in a state can say to be in a majority.

Opposition party: The elected representatives who are not the members of the ruling party belong to the opposition party. The representative together plays the role of questioning government decisions and actions. They also raise new issues for consideration in the Assembly.

Ruling party: The political party that has the majority is known as the ruling party.

Press conference: A gathering of media persons who are invited to hear about and ask questions on a particular issue and are then expected to report on this to the larger public.


Chapter 4:-Growing up as boy and girl

Gender is a social construction through which the social and cultural roles of males and females are defined.

Most of the societies value men and women differently. The role women play and the work they do are usually valued less than the roles men play and the work they do. This clears the fact that men and women do not have the same status.

Gender justice is an important issue to be highlighted.

Samoan Islands

The Samoan islands are one of the large groups of small islands in the southern part of the Pacific Ocean. Till the 1920s, children in this island did not go to school. When the babies started walking on own, they were left under the care of their older brothers and sisters. Children as old as five years looked after their younger siblings.

After attaining nine years of age, boys joined the older boys for outdoor activities like fishing and planting coconuts. However, girls continued looking after the younger ones.

When girls became teenagers, i.e., 14 years of age, they were allowed more freedom as they could then go for fishing and plantation activities or help their mothers in cooking, etc.

Madhya Pradesh

In Madhya Pradesh, India, boys and girls had a different outlook. The school for boys was open while the one for girls was closed.

Men and women do equal work, but it is not valued equally.

Valuing Housework

Many women work in offices and many do only household work.

Valuing housework is an important element which needs to be propagated in society.

If we look at the lives of domestic workers, they are involved in activities like sweeping, cleaning, cooking, washing clothes and dishes or looking after children. Most of these are women.

A number of housework actually involves many different tasks. The work requires strenuous and physically demanding situation.

Women’S Work and Equality

Equality is an important principle of our constitution which says that being male or female should not become a reason for discrimination.

While the constitution does not discriminate between male and female, in reality, discrimination still carries on.

Government has introduced measures like Anganwadis or Child Care Centres to improve the status of women in society.

The government has also started creche facilities to help women to take up employment outside the home.

We find distinctions between boys and girls in our societies. This begins at a very young age.

Boys are often taught to be tough and serious while girls are taught to be soft and mild.

Boys are given toys like cars and guns to play with while girls are seen playing with dolls. These toys become a way of telling children what they will have different futures when they become men and women.

Most societies value men and women differently. The roles women play and the work they do are usually valued less than the roles men play and the work they do. This clears the fact that men and women do not have the same status.

If a woman is a housewife, it is often said that she does not work. But the reality is that it is always the woman who bears the main responsibility for housework and caregiving tasks like looking after the family. As she does not earn money by doing these tasks, her work is not recognized.

The term houseworks involves many different tasks which require heavy physical work.

In both rural and urban areas women and girls carry heavy headloads of firewood. Housework also involves washing clothes, cleaning, sweeping and cooking foods, etc. for the family. All these works are very tough, still, women do them every day. They do not complain or show any anguish on their face.

The work of women is time-consuming too. They do not have much time for leisure.

Many women nowadays work both inside and outside the home. This is often referred to as the double burden. Women bear this double burden very skilfully and efficiently.

Equality is an important principle of our constitution which says that being male or female should not become a reason for discrimination. But what we see in reality is that inequality still exists between both the sexes. The government is, therefore, very much keen to take some positive measures to improve the situation.

The government has set up Anganwadis or Child-care Centres in several villages in the country.

The government has also started creche facilities to help women to take up employment outside the home.

Caregiving: Looking after the family with great sincerity.

Devalue: When we do not give due recognition for work, it means we devalue it. In our society, women’s work is easily devalued.

Double-burden: There are several women who work both inside and outside the home. This is known as a double burden.

Identity: It is a sense of awareness of who one is. For example, a person can be a brother, a pilot, an engineer, etc.

Physically demanding: It refers to the household tasks which are very tough and demand great physical strength.

Time-consuming: It refers to the various household tasks which take much time.

Strenuous: Very tough and difficult.

Chapter 5:-Women change  the world
Women have been facing inequalities at every step.

By getting an education, women have got opportunities to rise in every field.

Women’s movement has risen to challenge discrimination in all parts of the world.

Fewer Opportunities and Rigid Expectation

A lot of people feel that women are fit only for certain kinds of jobs as a nurse. They are not fit for technical jobs.

In most families, women are taught that after school they have to get married. Laxmi Lakra, however, broke this stereotype image when she became the first woman engine driver of the Northern Railways.

We live in a society full of pressures. If boys do not work hard and get a good salary they are bullied

Learning for Change

Going to school is an important part of life.

Today, it is difficult for us to imagine that school and learning could be seen as out of bounds or not appropriate for some children.

In the past, very few people learnt reading and writing. Most children learnt the work their families or elders did. Even in families where skills like pottery, weaving and craft were taught, the contribution of daughters and women was seen as secondary.

In the nineteenth century, new ideas about learning and education appeared. But there was a lot of opposition to educating girls ever then.

In the 1890s, Ramabai championed the cause of women’s education.

Rokeya Sakhawat Hossain learnt English from her elder brother and an elder sister in spite of family opposition and went on to become a famous writer.

Rashsundari Devi of Bengal was the first Indian woman to write an autobiography called ‘Amar Jiban’.

Schooling and Education Today
Today both boys and girls attend school in large numbers.

The difference in Their Education Still Remains

Today education is the right of both boys and girls, despite that only 50 % of the girls receive an education.

India has a census every 10 years which counts the population of the country. This information is used to measure things like literacy, sex-ratio, etc.

A huge number of SC and ST children leave school at an early age. The 2014 census even shows that Muslim girls are less likely than Dalit girls to complete primary school.

Many reasons like non-availability of teachers and schools, lack of transport, cost of education, indifferent attitude of teachers and parents are responsible for the negligence of education.

Women’s Movement

Women have individually and collectively struggled to bring about changes. This is called the Women’s Movement.

Different strategies have been used to spread awareness, fight discrimination and seek justice.

These movements are related to campaigning, raising awareness, protesting and showing solidarity.

Men and women in society are looked upon as playing specific gender roles.

Women have been facing inequalities at every step since time immemorial. No doubt, their position and status have been improved with the change of time, still, they lag behind men in almost every field.

In this male-dominated society, they fail to avail equal privileges and opportunities.

It has also been seen that some occupations are considered to be more suitable for men than for women. It means women are good at only certain jobs.

Many people believe that women make better nurses because they are more patient and gentle. It is also believed that women do not bear technical mind and therefore they are not capable of dealing with technical things. Thus, they have been stereotyped as good nurses, good teachers, etc. They are never seen as army officers, pilots, railway engine drivers, etc.

A majority of Indians believe in these stereotypes. It is, therefore, girls do not get the same support that boys do to study and train to become doctors and engineers.

Today’s women have become very aware. They are determined to break these stereotypes by excelling them in fields which were considered male preserves till now. We have now women pilots, engineers, police officers, scientists etc. We can mention here the name of Laxmi Lakra who by becoming an engine driver, showed the world that women can do everything.

Children especially boys are under great pressure. They are pressurised to think about getting a job that will pay a good salary.

It is a matter of great anxiety for the parents if their son shows his inclination towards studying subjects other than science or maths.

In our present social set-up parents have developed a false belief that only science and maths are meaningful subjects. Only these subjects can make their son’s future secured. These notions have no base. They must be eliminated from our mind. Subjects like history, political science, etc. are also job oriented.

One positive change that is visible today is that more and more children have started going to school. In the past, the skill of reading and writing was known to only a few. Most children learnt the work their families or elders did.

But girls faced the even worse situation. In communities that taught sons to read and write, daughters were not allowed to learn the alphabet.

Slowly and steadily there came more and more positive changes. The communities that never learnt reading and writing started sending their children to school. In the beginning, there was a lot of opposition jp educating girls. But there were also women and men who made efforts to open schools for girls.

Women struggled to learn to read and write. Here, the experience of Rashsundari Devi (1800-1890) is worth mentioning. She was a housewife from a rich landlord’s family. At that time, it was believed that if a woman learnt to read and write, she would become a widow. Despite this, she taught herself how to read and write in secret, after her marriage. She wrote her autobiography in Bangla which titled Amar Jaban,

Rokeya Sakhawat Hossain was another example who did a lot for women’s education. She knew how to read and write Urdu, but she was stopped from learning Bangla and English. In those days only boys were taught English. However, she learnt to read and write Bangla and English. Afterwards, she became a writer and wrote a remarkable story titled Sultana’s Dream in 1905. She did a lot to help other girls go to school and to build their own dreams. In 1910, she started a school for girls in Kolkata which is still functioning well.

No doubt more and more girls have started attending school, still they lag behind boys. As per the most recent census of 2001, 76% of boys and men are literate but the figure is comparatively very low in case of girls. Only 54% of girls and women are literate in India. Thus, the percentage of the male group is higher than the female group.

Girls who are from Dalit and Adivasi backgrounds are less likely to remain in school. One of the many reasons is that several families are too poor and unable to bear the cost of educating all their children. Boys easily get preference in such circumstances.

The position and status of women have undoubtedly improved a lot which is due to the collective efforts of the women of the country. Women’s Movement also gets the support of men. They used different strategies to spread awareness, fight discrimination and seek justice. For example, they organise campaigns to fight discrimination and violence against women. They also protest when violations against women take place. Women’s Movement also shows solidarity with other women and causes.

Stereotype: the Fixed image of a person and a community. Stereotypes prevent us from looking at people as unique individuals.

Discrimination: Treating people unequally.

Violation: When someone forcefully breaks the law or a rule or openly shows disrespect, we often say that he/she has committed a violation.

Sexual Harassment: Physical or verbal behaviour that is of a sexual nature and against a woman’s wishes.

Protest: To raise voice against the wrong action or decision.

Scheduled Caste (SC): It is the official term used for Dalit class of people.

Scheduled Tribe (ST): It is the official term used for Adivasi class of people.

Autobiography: Autobiography is the life sketch of the writer himself.

Manuscript: The script written in the writer’s own handwriting.

Census: Census is held every 10 years. It counts the whole population of the country. It also gathers information about the people living in India—their age, schooling, what work they do, and so on.

Chapter 6 :-Understanding media

Media refers to all means of communication, everything ranging from a phone call to the evening news on TV can be called media. TV, radio, and newspapers are forms of media. Since they reach millions of people across the world they are called mass media.

Media is the plural form of the word ‘medium’ and it describes the various ways through which we communicate in society.

Media and Technology

Life without media is difficult. Cable TV and the Internet are recent phenomena.

Both print media and electronic media have played an important role in social change.

Changing technology or machines help media to reach more people.

Television has enabled us to think of ourselves as members of the global people.

It is the responsibility of the media to present a fair and balanced report.

Media is far from being independent. This is because of the control of the government over media called censoring and because big business houses control the media.

An independent media means that no one should control and influence its coverage and news.

Media and Money

The different technologies that mass media use are expensive.

In a news studio, it is not only the newsreader who needs to be paid but also a number of other people who help put the broadcast together.

A lot of money is spent on getting the latest technology. To meet this cost, it needs money.

Media thus has come to be owned by big corporate.

Media, therefore, uses advertising as a tool to raise revenue.

Media and Democracy

Media plays a very important role in providing news and discussing events taking place in the country and the world.

New stories of media inform people about important events in the country.

Some important ways by which people can take about important events in the country are organizing public protests, starting a signature campaign, etc.

Setting Agendas

The media also plays an important role in deciding which stories to focus on.

By focusing on particular issues, it influences and shapes our thoughts. It is said the media sets the agenda for people.

Very recently, the media reported alarming levels of pesticides in cold drinks. This report led to safety standards being set for colas.

Media plays a very important role in our lives as it tells us about working of the government.

Freedom of expression should be given to media to report events independently.

Media is the plural form of the word ‘Medium’. It describes the various ways through which we communicate in society.

Media refers to all means of communication, everything ranging from a phone call to the evening news on television.

Television, radio, and newspapers are called mass media because they reach millions of people at the same time.

Cable television and the widespread use of the Internet is a recent phenomenon.

The technology that mass media uses keeps changing.

Newspapers and magazines come under print media while television and radio come under electronic media.

Changing technology, or machines and making technology more modern, helps media to reach more and more people. It also improves the quality of sound and the images. It also changes the ways in which we think about our lives.

Television plays a major role in our life. We cannot think of life without TV. It gives us news and entertainment and many other things.

Mass media uses expensive technologies. A TV studio needs lights, cameras, sound recorders, transmission satellites, etc. All these cost a huge amount of money.

Mass media also spends a lot of money on getting the latest technology.

Most television channels and newspapers become a part of big business houses in order to fulfill their requirement of money.

Mass media earns money by advertising different things such as surf, chocolates, etc.

Media plays a significant role in democracy. It provides news and discusses events that take place in the country and the world. It is on the basis of this information we come to know how the government works.

The information that the media provides should be balanced. A balanced report is one that discusses all points of view of a particular story and then leaves it to the readers to make up their minds.

Independent media can write a balanced report. Hence, it is necessary for the media to be independence.

But the reality is that media is far from independent.

There are two reasons behind it. The first is the control that the government has on the media. Where the government prevents either a news item or scenes from a movie, or a lyric of a song from being shared with the larger public, this is known as censorship. During the Emergency period (1975-77) the government censored the media.

While the government does continue to censor films, it does not really censor the media’s coverage of news.

Despite the absence of censorship by the government, most newspapers do not provide a balanced report.

It has been found out by the persons who research media that business houses control media. It means that the media is not independent.

Media sets the agenda. It means media has to decide what stories to focus on and therefore, decides on what is newsworthy.

Media should focus on issues that are significant in our lives. But very often it fails to do so. Cricket, fashion shows are very popular with the media.

Local media deals with small issues that involve ordinary people and their daily lives. Khabar Lahriya, a fortnightly newspaper, is run by eight Dalit women in Chitrakoot district in Uttar Pradesh. It is written in the local language, Bundeli.

Media: The word ‘media’ refers to all means of communication, everything ranging from a phone call to the news on television.

Public protest: When people collectively state their opposition to some issue by organizing a rally, starting a signature campaign, etc., it is known as a public protest.

Balanced report: A balanced report is one that discusses all points of view of a particular story and then leaves it to the leaders to make up their minds.

Censorship: The government has the power to disallow media from publishing or showing certain stories. This means that the government can censor the media.

Broadcast: A TV or radio programme that is widely transmitted.

Setting Agenda: One of the important functions of media is that it decides what stories should be focused on and thus decides on what is newsworthy. This is often said that the media sets the agenda.
Local Media: It deals with small issues that involve ordinary people and their daily lives. It publishes news of local importance.