27 January 2015

CBSE-NCERT Solution: Environment

CBSE NCERT Class VII (7th) | Social Studies | Geography

Chapter  :  Environment

CBSE NCERT Solved Question Answer

Q1. What is environment?
The word environment is derived from the French word “Environer/ Environner” meaning “neighbourhood”. The place, people, things and nature that surround any living organism is called environment. It is a combination of natural and human made phenomena.

Q2. When is the World Environment Day celebrated?
On 5 June every year World Environment Day is celebrated.

Q3. How is environment useful to us?
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.
Q4. Name the components of the Natural environment?
Land, water, air, plants and animals comprise the natural environment.

Q5. Differentiate between Biotic and Abiotic components of the environment.
Biotic The world of living organisms. E.g.  Plants and Animals
Abiotic The world of non-living elements. E.g. land

CBSE NCERT Class VII (7th) | Social Studies | Geography,  CBSE NCERT Solved Environment, CBSE NCERT Solution.Q6. What is an eco system? Explain with an example.
It is a system formed by the 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.There could be an ecosystem of large rain forest, grassland, desert, mountains, lake, river, ocean and even a small pond.

Q7. What is Lithosphere? How is it useful?
Lithosphere is the solid crust or the hard top layer of the earth. It is made up of rocks and minerals and covered by a thin layer of soil. It is an irregular surface with various landforms such as mountains, plateaus, plains, valleys, etc. Landforms are found over the continents and also on the ocean floors.Lithosphere is the domain that provides us forests, grasslands for grazing, land for agriculture and human settlements. It is also a source of mineral wealth.

Q8. What is Hydrosphere? How is it useful?
The domain of water is referred to as Hydrosphere. It comprises various sources of water and different types of water bodies like rivers, lakes, seas, oceans, etc. It is essential for all living organisms.

Q9. What is Atmosphere? How is it useful?
The Atmosphere is the thin layer of air that surrounds the earth. The gravitational force of the earth holds the atmosphere around it. It consists of a number of gases,
dust and water vapour.It protects us from the harmful rays and scorching heat of the sun. The
changes in the atmosphere produce changes in the weather and climate.

Q10. What is Biosphere? How is it useful?
Plant and animal kingdom together make Biosphere or the living world. It is a narrow zone of the earth where land, water and air interact with each other to support life.

Q11. How do humans modify the natural environment?
Human beings interact with the environment and modify it according to their need. Early humans adapted 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 learn new ways to use and change environment. They learn to grow crops, domesticate animals and lead a settled life. The wheel was invented, surplus food was produced, barter system emerged, trade started and commerce developed. Industrial revolution enabled large scale production. Transportation became faster. Information revoution made communication easier and speedy across the world.