CBSE  /  Class 9  /  Science  /  Natural Resources

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

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

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

  • Methane
  • Carbon dioxide
  • Carbon monoxide
  • Ammonia

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

  • Photosynthesis
  • Transpiration
  • Respiration
  • Burning of fossil fuels

  • 4. 
    ‘Ozone-hole’ means

  • a large sized hole in the ozone layer
  • thinning of the ozone layer
  • small holes scattered in the ozone layer
  • thickening of ozone in the ozone layer

  • 5. 
    Ozone-layer is getting depleted because of

  • excessive use of automobiles
  • excessive formation of industrial Units
  • excessive use of man-made compounds containing both fluorine and chlorine
  • excessive deforestation.

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

  • Ozone layer depletion
  • Greenhouse effect
  • Global warming
  • All of the above

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

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

  • 8. 
    Top-soil contains the following

  • Humus and living organisms only
  • Humus and soil particles only
  • Humus, living organisms and plants
  • Humus, living organisms and soil particles.

  • 9. 
    Choose the correct sequences

  • CO
  • CO
  • Inorganic carbonates in water organic carbon in plants → organic carbon in animals → scavengers
  • Organic carbon in animals → decomposers → CO

  • 10. 
    Major source of mineral in soil is the

  • parent rock from which soil is formed
  • plants
  • animals
  • bacteria
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