Quiz  /  Nitrogen Cycle Class 12 MCQ Questions With Answers

  • 1. 
    What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

  • nitrogen composition
  • ammonia
  • nitrogen fixation
  • denitrification

  • 2. 
    How do plants get the nitrogen they need?

  • from the air
  • from the soil or water in which they live
  • from the Sun
  • from broken-down rocks

  • 3. 
    Plants absorb...

  • nitrates
  • nitrogen fixing bacteria
  • animals
  • decomposers

  • 4. 
    Organisms that break down dead plants & animals and release nitrogen back into atmosphere...

  • bacteria
  • plants
  • animals
  • producers

  • 5. 
    Nitrogen-rich fertilizers and manure can cause water pollution.

  • True
  • False

  • 6. 
    What can excess amounts of nitrogen cause in ecosystems?

  • Disrupts the equilibrium of ecosystem, causing number of species to decline
  • Leads to improvement of an ecosystem due to healthy plant growth
  • Leads to high oxygen content in aquatic ecosystems
  • Increases the speed of decomposition of plants and animals

  • 7. 
    Bacteria fix nitrogen on plant roots. Plant roots provide sugar to bacteria. This is an example of _______.

  • mutualism
  • parasitism
  • commensalism
  • competition

  • 8. 
    Process where excess nutrients enter body of water causing overgrowth of aquatic plants and algae...

  • Eutrophication
  • Acid Precipitation
  • Nitrogen Fixation
  • Decomposition

  • 9. 
    Organisms require nitrogen to make which of the following?

  • glucose and starch
  • lipids and nucleic acids
  • proteins and nucleic acids
  • carbohydrates and proteins

  • 10. 
    How much of the atmosphere is composed of nitrogen gas?

  • 87%
  • 38%
  • 78%
  • 21%

  • 11. 
    Which plant is an example of a legume?

  • strawberries
  • carrots
  • peanuts
  • corn

  • 12. 
    How nitrogen is "fixed" into useable form for plants...

  • through action of bacteria only
  • through lightning only
  • through action of bacteria & lightning
  • through photosynthesis

  • 13. 
    Plants and animals need nitrogen to make __________.

  • Protein
  • Carbohydrates
  • Lipids
  • Minerals
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