CBSE Class 9 Science Natural Resources Quiz 2

1. The term “water-pollution” can be defined in several ways. Which of the following statements does not give the correct definition?

A The addition of undesirable substances to water bodies B The removal of desirable substances from water bodies C A change in pressure of the water bodies D A change in temperature of the water bodies

2. Which of the following is not a greenhouse gas?

A Methane B Carbon dioxide C Carbon monoxide D Ammonia

3. Which step is not involved in the carbon-cycle?

A Photosynthesis B Transpiration C Respiration D Burning of fossil fuels

4. ‘Ozone-hole’ means

A a large sized hole in the ozone layer B thinning of the ozone layer C small holes scattered in the ozone layer D thickening of ozone in the ozone layer

5. Ozone-layer is getting depleted because of

A excessive use of automobiles B excessive formation of industrial Units C excessive use of man-made compounds containing both fluorine and chlorine D excessive deforestation.

6. Which of the following is a recently originated problem of environment?

A Ozone layer depletion B Greenhouse effect C Global warming D All of the above

7. When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?

A It moves along with oxygen into the cells B It comes out with the CO C It is absorbed only by the nasal cells D Nitrogen concentration is already more in the cells so it is not at all absorbed.

8. Top-soil contains the following

A Humus and living organisms only B Humus and soil particles only C Humus, living organisms and plants D Humus, living organisms and soil particles.

9. Choose the correct sequences

A CO B CO C Inorganic carbonates in water organic carbon in plants → organic carbon in animals → scavengers D Organic carbon in animals → decomposers → CO

10. Major source of mineral in soil is the

A parent rock from which soil is formed B plants C animals D bacteria