Quiz  /  Nitrogen Cycle

  • 1. 
    Which of the following chemical formulas represents the Nitrogen in the atmosphere?

  • NO4
  • N2
  • NH4
  • NO3

  • 2. 
    What living organisms play an important role in helping Nitrogen change states in the soil?

  • Reptiles
  • Bacteria
  • Mammals
  • Algae

  • 3. 
    Which process in the nitrogen cycle turns dead plants and animals into ammonium?

  • Ammonification
  • Fixation
  • Assimilation
  • Nitrification

  • 4. 
    Which process in the nitrogen cycle turns ammonium into nitrates?

  • Nitrification
  • Fixation
  • Assimilation
  • Ammonification

  • 5. 
    Which process in the nitrogen cycle takes extra nitrogen from the soil and puts it back into the air?

  • Denitrification
  • Nitrification
  • Fixation
  • Assimilation

  • 6. 
    Which process in the nitrogen cycle turns nitrogen into ammonium?

  • Fixation
  • Ammonification
  • Nitrification
  • Assimilation

  • 7. 
    Which process in the nitrogen cycle occurs when plants absorb nitrogen from nitrates in the soil?

  • Nitrification
  • Assimilation
  • Ammonification
  • Fixation

  • 8. 
    In what way is nitrogen important to life on Earth?

  • It is used in making DNA
  • It is used in amino acids and proteins
  • It is used to make chlorophyll in plants
  • All of the above

  • 9. 
    True or False: Human activities such as nitrogen fertilizer can upset the balance of the nitrogen cycle.

  • TRUE
  • FALSE

  • 10. 
    Around what percentage of the Earth's atmosphere is nitrogen?

  • 78%
  • 30%
  • 2%
  • 14%
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