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Natural Resources CBSE Class 9

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Question 1/20

Q 1. 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 2. Rain containing some ice is called

Solution

Precipitation in the form of ice pellets created by the freezing of rain is called sleet. 

Q 3. Solar radiations heat up

Solution

Solar radiations heat land faster than water bodies. 

Q 4. Which of the following is the cause of oceanic water pollution?

Solution

Oil spill is the major cause of oceanic water pollution. 

Q 5. Bad ozone is also called

Solution

Bad ozone, which is harmful to breathe, is also called ground level ozone. 

Q 6. The atmosphere maintains the temperature of the Earth because

Solution

The atmosphere maintains the temperature of the Earth as it holds air which is a bad conductor of heat. 

Q 7. 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 8. The life-supporting gases such as O2, CO2 and N2 are chiefly concentrated in the

Solution

The troposphere has life-supporting gases such as oxygen, carbon dioxide and nitrogen. 

Q 9. The layer above the troposphere is the

Solution

The stratosphere is the layer above the troposphere. 

Q 10. Silicate and oxide minerals are found in

Solution

Silicate and oxide minerals are found within the crust and mantle. 

Q 11. Condensation is a step in the

Solution

Condensation is a step which takes place in the water cycle. 

Q 12. Carbon is found as _________ in the atmosphere.

Solution

Carbon is found as carbon dioxide in the atmosphere. 

Q 13. Ammonification is the microbial conversion of organic nitrogen to

Solution

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

Q 14. What is the climate in the rainforest?

Solution

Moist and humid climate prevails in the rainforest. 

Q 15. Which of the following is the major reason for algal bloom?

Solution

Eutrophication is characterised by excessive plant and algal growth. 

Q 16. 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 17. The increased carbon dioxide level is because of

Solution

When trees are removed from the forest, it results in an increased carbon dioxide level. 

Q 18. Oil spill is a

Solution

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

Q 19. The layer closest to the Earth is the

Solution

The troposphere is the closest to the Earth. 

Q 20. The water cycle is also known as the

Solution

The water cycle is also known as the hydrological cycle. 

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Natural Resources Notes

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