Quiz  /  Nitrogen Cycle Class 9 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. 
    According to this diagram, animals get proteins from eating ________________________

  • decomposers
  • bacteria
  • plants
  • sunlight

  • 3. 
    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

  • 4. 
    What happens when organisms die and decay?

  • Their bodies are lifted up
  • Their nitrogen returns to the soil
  • they keep their nitrogen
  • They stay on earth forever

  • 5. 
    Plants absorb...

  • nitrates
  • nitrogen fixing bacteria
  • animals
  • decomposers

  • 6. 
    How do animals get the nitrogen they need?

  • From the air they breathe
  • From the water they drink
  • From the food they eat
  • From the sun

  • 7. 
    What is the formula for atmospheric nitrogen?

  • N
  • N2
  • NH3
  • NO3

  • 8. 
    The process in which nitrogen circulates and is recycled is called

  • The nitrogen cycle
  • The carbon cycle
  • The water cycle
  • The phosphorus cycle

  • 9. 
    According to this diagram, plants use nitrogen to make _________________________

  • bacteria
  • animals
  • proteins
  • decomposers

  • 10. 
    Organisms that play a role in the nitrogen cycle

  • only plants
  • only animals
  • only bacteria
  • plants, animals, & bacteria

  • 11. 
    Organisms that break down dead plants & animals and release nitrogen back into atmosphere...

  • bacteria
  • plants
  • animals
  • producers

  • 12. 
    Nitrogen-rich fertilizers and manure can cause water pollution.

  • True
  • False

  • 13. 
    Nitrification happens in the ______

  • Air
  • Soil
  • Ground Water
  • Plants

  • 14. 
    What is the process where plants use nitrates to grow?

  • Nitrogen Fixation
  • Ammonification
  • Assimilation
  • Nitrification

  • 15. 
    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

  • 16. 
    What is the process where bacteria turns Nitrogen gas from the atmospheres into usable compounds?

  • nitrogen composition
  • nitrogen fixation
  • ammonia
  • denitrification

  • 17. 
    Bacteria fix nitrogen from the atmosphere into a form plants can use.

  • True
  • False

  • 18. 
    Bacteria fix nitrogen on plant roots. Plant roots provide sugar to bacteria. This is an example of _______.

  • mutualism
  • parasitism
  • commensalism
  • competition

  • 19. 
    Process where excess nutrients enter body of water causing overgrowth of aquatic plants and algae...

  • Eutrophication
  • Acid Precipitation
  • Nitrogen Fixation
  • Decomposition

  • 20. 
    Organisms that need nitrogen to survive.

  • only plants
  • only animals
  • only bacteria
  • all living things

  • 21. 
    Organisms require nitrogen to make which of the following?

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

  • 22. 
    How much of the atmosphere is composed of nitrogen gas?

  • 87%
  • 38%
  • 78%
  • 21%

  • 23. 
    _____ is the conversion of organic nitrogen into ammonia

  • Nitrogen Fixation
  • Ammonification
  • Denitrification
  • Assimilation

  • 24. 
    Which plant is an example of a legume?

  • strawberries
  • carrots
  • peanuts
  • corn

  • 25. 
    What happens when too much Nitrogen finds its way to the ocean?

  • Algae Bloom
  • Acid Precipitation
  • Nitrogen Fixation
  • Decomposition
Report Question
warning
access_time
  Time