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 :-)
No comments:
Post a Comment