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Natural Resources CBSE Class 9

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Question 1/20

Q 1. Which of the following is the cause of oceanic water pollution?

Solution

Oil spill is the major cause of oceanic water pollution. 

Q 2. The process by which bacteria in soil oxidise ammonia to form nitrates and nitrites is called

Solution

Nitrification is the process by which bacteria in soil oxidise ammonia and form nitrates and nitrites. 

Q 3. Which of the following is a greenhouse gas?

Solution

The greenhouse effect describes the Earth's heat-reflective layer caused by atmospheric gases including carbon dioxide, methane and nitrous oxide. 

Q 4. Oil spill is a

Solution

Oil spill is a point source pollution which comes from a single source. 

Q 5. The main source of atmospheric oxygen is

Solution

The main source of oxygen in the Earth's atmosphere is derived from oxygenic photosynthesis. 

Q 6. Which of the following is organic matter?

Solution

Humus is composed of organic matter which is present in the soil. It includes dead and decaying plants and animals. 

Q 7. Ammonification is the microbial conversion of organic nitrogen to

Solution

Conversion of organic nitrogen to ammonia and ammonium is called ammonification. 

Q 8. Removal of useful components from soil and addition of harmful substances is called

Solution

Soil pollution is the removal of useful components from soil and addition of harmful substances. 

Q 9. Which of the following is not a biogeochemical cycle?

Solution

Sodium cycle is not a biogeochemical cycle. 

Q 10. Deforestation may reduce the chances of

Solution

Deforestation reduces the chances of rainfall. 

Q 11. The layer closest to the Earth is the

Solution

The troposphere is the closest to the Earth. 

Q 12. What is the percentage distribution of icecaps and glaciers in freshwater?

Solution

The distribution of icecaps and glaciers in freshwater is 68.7%. 

Q 13. The temperature ranges from−190C to 110C on the Moon. This is because of

Solution

Because of absence of the atmosphere on the Moon, the temperature ranges from−190C to 110C. 

Q 14. Addition of undesirable substances such as fertilisers and pesticides is called

Solution

Addition of undesirable substances such as fertilisers and pesticides is called water pollution.

Q 15. Which of the following is not a step of the nitrogen cycle?

Solution

Precipitation is a step of the water cycle. 

Q 16. Conversion of atmospheric nitrogen to a combined form through chemical and biological action is called

Solution

Nitrogen fixation is the conversion of atmospheric nitrogen to a combined form through chemical and biological action. 

Q 17. Nitrogen fixation can be done by

Solution

Nitrogen fixation can be done by industries, Rhizobium bacteria and lightning. 

Q 18. Burning of fossil fuels adds

Solution

Burning of fossil fuels adds carbon dioxide, sulphur dioxide, nitrogen dioxide and gases to the air. 

Q 19. Depletion of ozone molecules in the stratosphere is because of

Solution

Chlorofluorocarbons and other halogenated ozone-depleting substances are mainly responsible for man-made chemical ozone depletion. 

Q 20. The process in which water vapour changes to clouds is called

Solution

Condensation is a process in which water vapour gets cold and changes to clouds. 

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