Natural Resources - Class 9th

Biotic components of biosphere is not constituted by – (a) Producers (b) Consumers (c) decomposer (d) air [1]

 2. Major source of mineral in soil is the – (a) Parent rock from which soil is covered (b) Plants (c) animals (d) bacteria [1]

 3. One of the following factors does not lead to soil formation in nature (a) the sun (b) water (c) wind (d) polythene bags [1]

4. The nitrogen molecules present in air can be converted into nitrates and nitrites by – a) a biological process of nitrogen fixing bacteria present in soil b) a biological process of carbon fixing factor present in soil c) any of the industries manufacturing nitrogenous compounds. d) The plants used as cereal crops in field [1]

 5. What is the role of decomposer in biogeochemical cycles? [2]

6. What is greenhouse effect? Name a green house gas? [2]

7. How can we prevent soil erosion? [2]

8. What are the causes of water pollution? [2]

 9. List the abiotic and biotic factors of soil formation. [3]

10. Mention human activities that lead to air pollution. [3]

 11. Why does Mathura refinery pose problem to Taj Mahal ? [3]

12. How does the atmosphere act as a protective blanket? Mention the harmful affects of ultraviolet rays? [3]

13. Draw nitrogen cycle? Explain the different steps. [5]

1. Which one of these are not fossil fuel – (a) coal (b) Petrol (c) Diesel (d) wood [1]

 2. Which step is not involved in the carbon cycle? (a) Photosynthesis (b) Transpiration (c) Respiration (d) Burning of fossil fuels. [1]

3. Total earth’s surface covered by water is (a) 75% (b) 60% (c) 85% (d) 50% [1]

 4. Growth of lichens on barren rocks is followed by the growth of (a) Mosses (b) ferns (c) gymnosperms (d) Algae. [1]

 5. What are the different types of natural resources? Give examples. [2]

 6. Differentiate between renewable and non-renewable resources. [2]

7. River from land, add minerals to sea water. Discuss how? [2]

8. Draw water cycle. [2]

 9. Give reasons – a) step farming is common in hills. b) fertile soil has lot of humus. [3]

10. What are the harmful effects of air pollution. [3]

 11. Why does water need conservation even though large oceans surround the land masses? [3]

 12. What is weathering? What are the different means by which weathering occurs. [3]