Tuesday, July 21, 2020

New kings and knigdom class 7 history


Chapter 2 :- New kings and kingdoms

1.Dynasty:-A family of rules who rules over a country for a long period of time.

2.Kingdoms:-Any country which is ruled by a monarch (king or queen) is considered to be a kingdom

3.Empire:-An empire can be said is a large kingdom. It is traditionally larger than a kingdom and many consists of many different regions and nations may be far away from head of kingdom i.e. it's capital.

The emergence of new dynasties:-

  • By the seventh century there were big landlords or warrior chiefs in different regions of the subcontinent called Samantha's.
  • They were expected to:-
  • bring gifts for their kings ,
  • be present at their courts
  • provide military support.
  • As Samantas gained power and wealth, they declared themselves to be maha-samanta, maha-mandaleshvara.
  • Sometimes they asserted their independence from their overlords.
  • For example:- Rashtrakuta(in the Deccan)were the sub-ordinate to Chalukyas of Karnataka initially.
  •  But in mid eighth century, its chief, Dantidurga overthrew his Chalukya overlord and performed a ritual called hiranya-garbha.
  • When this ritual was performed with the help of Brahmanas, it was thought to lead to re-birth of sacrifices as a Kshatriya, even if he was not one by birth.
  • In other cases , men from enterprising families used their military skills to carve out kingdoms. 
  • For example:- the Kadamba Mayurasharman and Gujarara- Pratihara Harichandra. were  Brahmanas who gave up their traditional professions and took up arms, successfully establishing kingdoms in Karnataka and Rajasthan respectively.

Administration in kingdoms:-

  • Many kings adopted high -sounding titles such as maharaja-adhiraja, tribhuvana-chakravartin and so on
  • Inspite of this, they share power with their Samantas as well as with association of peasants, traders and Brahmanas.
  • In each of these states, resources were obtained from the producers and traders.
  • These resources were used to finance the king's establishment, constuction of temples ,forts, in wars.

Prashastis and land grants:-
  • Prashastis contain details that may not be literally true.
  • It tells us how rulers wanted to depict themselves - as valiant, victorious warriors.
  • These were composer by learned Brahmanas, who occasionally helped in the administration.
  • Kings rewarded Brahmanas by grants of land. 
  • These were recorded on copper plated, which were given to those who received the land.
  • Note:- Ruler of Kanauj won a victory over Chakrayudha.
  • A poem containing the history of kings who ruled over Kashmir is composed by author named Kalyana.

Warfare for wealth:-
Tripartite struggle:-
  • Kanauj , a city in the Ganga valley was an important city of the time.

  • For centuries, rulers belonging to the Gujarat-Pratihara, Rashtrakuta and Pala dynasties fought for control over Kanauj . It is known as tripartite struggle.

Sultan Mahmud of Ghazni, Afghanistan:-
  • He ruled from 997to 1030.
  • He extended control over parts of Central Asia, Iran and North-western part of subcontinent.
  • He raised the subcontinent almost every year.
  • His targets were wealthy temples, including that is Somnath, Gujarat.
  • He used wealth to create a splendid capital city at Ghazni.
  • He hired a scholar named Al-Biruni to write an account of subcontinent.
  • This Arabic work is known as Kitab ul-Hind.
  • Other kings were Chahamanas , later known as the Chauhans, rulerld over the region around Delhi and Ajmer.
  • The best Known Vhahamana ruler was Prithviraja III Who defeated Sultan Muhammad Ghori in 1191 but lost to him in 1192.

The Cholas:-

From Uraiyur to Thanjavur:-
  • A minor chiefly family known as the Muttaraiyar held power in the Kaveri delta.
  • They were subordinate to the pallava kings of Kanchipuram.
  • Vijayalaya captured the delta from the Muttaraiyar in the middle of the ninth century.
  • He built the town of Thanjavur and a temple for goddess Nishumbhasudini there.
  • The successors of Vijayalaya conquered neighbouring regions and the kingdom grew in size and power.
  • The Pandyan and the Pallava territories to the south and north were made part of this kingdom.
  • Rajaraja I become king in 985 and expanded control over most of the area.
  • Rajaraja's. Son Rajendra I continued his policies and even raided the Ganga valley, Sri Lanka and countries of Southern Asia, developing a navy for these expeditions.

Splendid Temples and Bronze sculpture:-

  • The big temples of Thanjavur and Gangaikonda-cholapuram are architectural and sculptural marvels.
  • These temples were built by Rajaraja and his son Rajendra.
  • Chola temples often became the nuclei of settlements which grew around them.
  • These were centres of craft production.
  • Temples were endowed with land by rulers as well as by others.
  • The product of this land went into maintaining all the specialists who worked at the temple and very often lived near it such as priests garland makers , cooks, sweepers, musicians, dancers etc .
  • These temples were not only the place of worship , they were the hub of economic , social and cultural life as well.
  • Amongst the crafts associated with temples the making of bronze images was the most distinctive.
  • Chola bronze images are considered amongst the finest in the world.
  • While most images were of deities sometimes images were made of devotees as well.
  • Agriculture and irrigation:-
  • Many of the achievements of the Cholas were made possible through new developments in agriculture.
  • The river Kaveri branches off into several small channels before emptying into the Bay of Bengal.
  • These Chennels overflow frequently, depositing fertile soil on their banks.
  • Water from the channels also provide the necessary moisture for agriculture, particularly the cultivation of rice.
  • Although agriculture had developed earlier in other parts of Tamil Nadu, it was only from the fifth or sixth century that this area was opened up for large scale cultivation.
  • Forests had to be cleared in some regions, land had to be levelled in other areas.
  • In the delta region embankments had to be built to prevent flooding and canals has to be constructed to carry water to the fields.
  • In many areas two crops were grown in a year.
  • In many cases it was necessary to water crops artificially. 
  • A variety of methods were used for irrigation .
  • In some areas well were dug.
  • In other places huge tanks were constructed to collect rainwater.
  • This irrigation require planning, organising labour and resources , maintaining these works.
  • Most of the new rulers and people living in villages took an active interest in these activities.

The administration of the Empire:-
  • The settlements of peasants(known as Ur) became.prosperous with the spread of irrigation agriculture. 
  • Groups of such villages formed larger units called Nadu.
  • The village council and the Nadu performed several administrative functions including dispensing justice and collecting taxes.
  • Rich peasants of the Vellala Caste exercised considerable control over the affairs of the Nadu under the supervision of central chola government.
  • The Chola kings gave some rich landowners titles like muvendavelan, araiyar etc.
  • Brahmanas often received land grants or brahmadeya.
  • As a result, a large number of Brahmana settlements emerged in the Kaveri valley as other parts of South India.
  • Each brahmadeya was looked after by an assembly or Sabha of prominent Brahmana landholders 
  • These assemblies worked very efficiently.
  • Their decisions were recorded in detail in inscription, often on the stone walls of temples.
  • Association of traders known as nagarams also occasionally performed administrative functions in towns.
  • Inscription from Uttaramerur in Chingleput district, Tamil Nadu, provide details of the way in which Sabha was organised.
  • The Sabha had separate committees to look after irrigation work , gardens, temples etc.
  • Name of those eligible to members of these committees were written on small tickets of palm leaf.

Thank you:-)


Saturday, July 4, 2020

Our environment class 10

Introduction:
  • Everything around us that surrounds us is environment. It includes both living (biotic) and non-living (abiotic) components.
  • Interaction between these biotic and abiotic Components form an ecosystem.
  • In an ecosystem living Components depend upon each other for their food which gives rise to food chains and food webs in nature.
  • In environment human activities lead to environmental problems such as depletion of ozone layer and production of huge amount of garbage.
Ecosystem:-
  • All the interacting organisms in an area together with non-living constituents of the environment forms an ecosystem.E.g. Forests, ponds.
  • Types of ecosystem:- Two types
  • 1.Natural ecosystem:- The ecosystems which exists in nature on its own.
  • Ex:- Forest, lake, ocean.
  • 2.Artificial ecosystem:- Man-made ecosystem are called artificial ecosystem.
  • Ex:- Crop field, garden, aquarium etc.
Components of ecosystem:- Two
  • Abiotic (Air, water, soil) and  
  • Biotic (planst and animals)
1.Biotic Component:- 
  • All living Components forms biotic Component.
  • Ex:- Plants, Animals, fungi etc.

2.Abiotic Component:-
  • All non-living Components form an ecosystem.
  • Ex:- air, water, land, light etc.
On the basis of nutrition biotic Components are further divided into:-
  • Producers
  • Consumers
Producers:-
  • All green plants and blue green algae can produce their own food using abiotic Components (By photosynthesis)

Consumers:-
  • Includes all animals which depends on producers directly or indirectly for their food.
Division of Consumers:-
  • 1.Herbivores:- Feed on plants.
  • Example:- Goat, deer.
  • 2.Carnivores:- Feed on animal's Flesh.
  • Example:- Tiger, Crocodile.
  • 3. Omnivores:- Eats both plants and animals.
  • Example:- Humans, Dog etc.
  • 4.Parasites:- Organisms which live either in or on the body of host is called parasite. It is of two types:- ecto-parasite(e.g.lice, cascuta) and endo-parasite(e.g.Liver fluke).
Decomposers:-
  • Organism which break down complex food substances into simpler ones.
  • Or
  • 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
Decomposition:- Process in which complex organic matter are broken down into simpler forms.
    Rate of decomposition:- Several factors determine rate of decomposition.
    • 1.Soil quality:- 
    • ✓Abundance of micro-organism,
    • ✓moisture content,
    • ✓Temperature,
    • ✓High aeration,
    • ✓pH,
    • 2.Compostion of organic matter:-
    • 3.Climate.
    Importance of decomposition:-
    • Convert dead plant and Animals remains into humus.
    • Improve soil fertility
    • Nutrients are releasing back to soil.
    Humus:- 
    • Decomposer when eat upon dead plant and animal tissues, they convert them into a dark colour of substance called humus.
    • Presence of humus ensures that the nutrients of the dead plants and animals are released into soil
    Food chain:-
    • Series of living organisms feeding on one another.
    • 3 step food chain:-
    •  grass -> deer -> lion
    • 4 step food chain:-
    • Plant -> goat -> fox -> lion
    • 5 step food chain:-
    • Grass -> insects -> frog -> snake -> eagle

    Trophic level:- Each level of a food chain is called trophic level.

    Food web:- Network of food chains is called food web. In nature food web exist.

    Flow of energy between trophic level:-
    • Flow of energy in a food chain is unidirectional.
    • Green plants capture 1% of sunlight ad convert it into food energy.

    10%Law:-
    • Only 10% of energy is transferred to next trophic level. The remaining 90% energy is used in life processes by present trophic level.
    • Due to gradual decrease in. Energy food chain contains 3-4 trophic levels.
    Decrease in energy:-
    1000KJ --> 100KJ --> 10KJ -->1KJ.

    Biological magnification:-
    • The concentration of harmful chemicals increases with every next trophic level in a food chain. This is caly biological magnification.
    • Maximum concentratration of each chemical get accumulated in human bodies as  human occupy the top level in any food chain.
    Food web:-
    • In nature large numbers of chains are interconnected forming a food web.
    Environmental problems:-
    • Change in the environment affect us and our activities change the environment around us.
    • Human activities leads to pollution, deforestation etc.
    Ozone layer:-
    • Protective blanket around the earth which absorbs most of harmful UV rays of sunlight, this protecting living beings from many health hazards such as skin cancer, cataract, destruction of plants etc.
    • O3 (ozone) layer is present at higher levels of atmosphere.
    • Sadly poison at ground level.
    Formation ozone molecule:-
    • 1.high energy of UV radiation breakdown the O2 molecules into free oxygen atom.
    • O2 ( in presence of)-->O + O
    • 2.These oxygen atoms combine with oxygen molecule O2 to form ozone molecule.
    Depletion of ozone layer:- 
    • The decrease in thickness of ozone layer over Antarctica was observed in 1985 and was termed as ozone hole.
    • The decrease was linked to excessive use of synthetic chemicals like CFCs which is used in Refrigerators , ACs, fire extinguishers.
    • UNEP [United Nations Environment Programme] succeeded in forging an agreement to stop CFC production at 1986 level by all counts.
    Garbage Disposal:- 
    • Improvements in lifestyle have resulted in accumulation of large amount of waste material
    Types of material in Garbage:- 
    1.) Biodegradable:-
    • Substances which can be decomposed by the action of micro-organisms are called biodegradable waste.
    • Ex:- Fruits, Vegetables peels, paper etc.
    2.) Non-biodegradable:- 
    • Substances which cannot be decomposed by the action of micro-organisms are called non-biodegradable waste.
    • Example:- Plastic, metals, pesticides etc.
    • Micro-organisms release enzyme which decompose the material but these enzymes are specific in their action that's why enzymes cannot decompose all the materials.
    Methods of waste disposal:-
    1.Biogas Plant:-
    • Biodegradable waste can be used in biogas plant to produce biogas and manure.
    2.Sewage treatment plant:-
    • The drain waste can be cleaned in sewage treatment plant before adding it to rivers 
    3.Land fillings:- 
    • The wastes are buried in low lying areas and compacted by rolling with bulldozers
    4.Composting:-
    • Organic wastes are filled in a compost pit and converted with a layer of soil, after about three months garbage changes to manure.
    5.Recycling:-
    •  Non-biodegradable wastes are recycled to make new items.
    6.Reuse:- 
    • It is a conventional technique to use an item again.
    • Example:- Newspaper for making envelops 

    Thankyou...


    Wednesday, July 1, 2020

    Forests: Our Lifeline class 7 NCERT


    Subject: Forest: Our Lifeline

    • Large area of land covered with huge trees, shrubs (rose) and herbs(grass) is called forest.
    • Forests serve as green lungs and water purifying systems in Nature.
    • Plant variety in a forest:- Bamboo, Neem, Palash, Teak, Fig, Ferns, Mosses, Maple, oak, pine, sal, semal, Sheesham, Khair, Amla, kachnar.
    • Animal variety in a forest :- boar, bison, jackals, porcupine, elephant.

    Who has planted so many trees in forest?
    ->In nature, trees produce enough seeds. The forest floor provides favourable conditions for them to germinate and develop into seedlings and saplings. Some grow up into trees.

    Layers of forest:- Three layers
    1.Crown:-
    •The branchy part of a tree above the stem is called as crown.
    2.Canopy:-
    •It is the structure formed by collection of individual plant crowns of a plant community.
    3.Understorey in forest:-
    •Plant layers growing beneath the forest canopy.
    •Forest understory receive less intense light than the forest canopy.

    Autotrophs:-Prepare their own food. e.g., plants, some algae and bacteria.
    Heterotrophs:-
    Depend on others for their food.e.g., animals, humans, fungi. 
    It includes:-
          ✓Herbivores , 
          ✓Carnivores and
          ✓Omnivores.
    Decomposer/Saprotrophs:- •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

    Decomposition:- Process in which complex organic matter are broken down into simpler forms.

    Detritus:- Raw material for decomposition including dead plant remains , dead animals remains and faecal matter.

    Rate of decomposition:- Several factors determine rate of decomposition.
    1.Soil quality:- 
    ✓Abundance of micro-organism,
    ✓moisture content,
    ✓Temperature,
    ✓High aeration,
    ✓pH,
    2.Compostion of organic matter:-
    3.Climate.

    Importance of decomposition:-
    • Convert dead plant and Animals remains into humus.
    • Improve soil fertility
    • Nutrients are releasing back to soil.

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

    Forests are called green lungs. Why?
    Because plants release oxygen through the process of photosynthesis. The plants help to provide oxygen for animal respiration. They also maintain the balance of oxygen and carbon dioxide in the atmosphere . That is why forests are called lungs.

    Food chain:- series of living organisms feeding on one another.
    3 step food chain:-
     grass -> deer -> lion
    4 step food chain:-
    Plant -> goat -> fox -> lion
    5 step food chain:-
    Grass -> insects -> frog -> snake -> eagle

    Trophic level:- Each level of a food chain is called trophic level.

    Food web:- Network of food chains is called food web. In nature food web exist.

    Threat to forests:-
    Human activities pose a threat to forests.

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

    Cause of deforestation:-
    •Overpopulation,
    •Agriculture,
    •Human settlement,
    •Making furniture,
    •Fuel
    •Forest fires

    Harmful effects of deforestation:-
    •Loss of species,
    •Soil erosion,
    •Increased concentration of Carbon dioxide,
    •Increase of earth's temperature,
    •Lower ground water level,
    •Destroy forest ecosystem.
    •Possibility of flood increases
    •Possibility of drought increase

    Major Victims of deforestation:-
    Plants and animals


    IMPORTANCE OF FOREST:-
    •Provide a home for many animals and plants.
    •Provide useful products like gum, oils, spices, fodder for animals etc.
    •Provide habitat to animals, birds and insects.
    •provide food and shelter to many tribes
    •support growth to plants
    •maintain the balance of Oxygen and carbon dioxide in atmosphere so called green lungs
    •furniture making
    •Medicinal use of many plants
    •control floods
    •Natural absorber of rain water so help to Recharge ground water and thus maintain water table
    •Prevent water logging in soil during heavy rainfall.
    • Absorb noise 

    Forest is a dynamic living entity.
    i.e., it is full of life

    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 colouref 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


    Thankyou 😃😃....