Q.1. Fill in the blanks
(i) Things essential for life that are provided by nature are known as _______resources.
(ii) ______breeze is the movement of a wind from land to sea.
(iii) All cellular processes need ______ medium to occur.
(iv) ______ is produced due to breaking of rocks at or near the surface of earth due to various factors.
(v) Washing away of soil particles and exposure of underneath rocks is known as______.
Q.2. One of the following factors does not lead to soil formation in nature
(a) The sun
(b) Water
(c) Wind
(d) Polythene bags
Q.3. Total earth’s surface covered by water is
(a) 75%
(b) 60%
(c) 85%
(d) 50%
Q.4. The fertility of soil is lost due to
(a) Afforestation
(b) crop rotation
(c) Soil erosion
(d) Strip cropping
Q.5. Which substance is responsible for depletion of ozone layer?
(a) CO2
(b) CH4
(c) CFC’S
(d) CO
Q.6. The major component of air in Venus & Mars is –
(a) O2
(b) CO2
(c) NO2
(d) He
Q.7. What is the greenhouse effect?
Q.8. Why do organisms need water?
Q.9. What are the different types of natural resources? Give examples.
Q.10. Mention two causes of over-exploitation of natural resources.
Q.11. What is biological nitrogen fixation? Name the organisms responsible for it.
Q.12. What causes winds?
Q.13. How is soil formed?
Q.14. Why is water essential for life?
Q.15. Mention human activities that lead to air pollution.
Q.16. How is rain formed?
Q.17. How is soil pollution done?
Q.18. How do forests influence our air, water and soil?
Q.19. What is weathering? What are the different means by which weathering occurs.
Q.20. Why is life possible on earth?
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1. What are natural resources? |
2. How are natural resources classified? |
3. What are the impacts of overexploitation of natural resources? |
4. How can we conserve natural resources? |
5. What role can individuals play in conserving natural resources? |
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