Page 9 - sst_class_07

3. Lithos refers to __________.

(a) water (b) rocks (c) gases (d) moisture
4. Which is a human made environment?
(a) mountain (b) sea (c) road (d) ocean
5. What is a threat to environment?
(a) growing plant (b) growing polluation

(c) growing crops (d) none of these
B. Fill in the blanks :

1. Our environment consists of two main components ________________ and ________________.
2. The land on which we live is not a ________________ thing.
3. ________________ is the solid crust or the hard top layer of the earth.
4. The Lithosphere is covered with thin layer of ________________.
5. ________________ percent of the earth’s water is in the oceans.
C. Match the following :

Column 'A' Column 'B'
1. Hydrosphere (a) Thin layer of air
2. Ecology (b) Water bodies on the earth’s surface
3. Atmosphere (c) Solid crust of the earth
4. Environment (d) Inter relationship between living organisms and their surroundings

5. Lithosphere (e) Conditions within which an organism exists
D. Write ‘T’ for true and ‘F’ for false :
1. We live on earth in different types of surroundings.
2. Earth is one of the eleven planets of the Solar System.
3. Biotic environment includes the world of non-living organisms.
4. Abiotic environment includes the world of living organisms.
5. Lithosphere has many ups and downs.

E. Answer these Questions :
1. What is an ecosystem?
2. Define environment. Which are the major components of environment?
3. Why are human beings called the most important part of the environment?

4. Define the human environment.
5. What is lithosphere?
6. Why is biosphere important for us?

Life Skills and Value (Activity)

• Draw neat diagram of the structure and composition of the atmosphere.
• Prepare a project report on the measures taken in your area for improvemental conditions.
• Find out the reasons why our environment is getting degraded nowadays. Organize a class level
debate for the protection of environment.

Social Studies-7 9