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Question

Draw a well-labelled diagram of the nitrogen cycle?


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Solution

Nitrogen cycle:

  1. The process of turning atmospheric nitrogen (N2) into biological nitrogen is known as nitrogen fixation.
  2. It's an anaerobic (oxygen-free) process that catalyzes the conversion of atmospheric nitrogen (N2) to ammonia (NH3).
  3. The nitrogen fixation has done by nitrogen-fixing bacteria.
  4. Some of them are free-living bacteria, whereas others are nitrogen-fixing symbionts. E.g. Rhizobium.
  5. The process of nitrification is the conversion of ammonium ions (NH4) into nitrides.
  6. The first is as nitrites (NO2) and then as nitrate (NO3).
  7. The oxidation of nitrite (NO2) to nitrate (NO3) is the second stage.
  8. When an organism excretes waste or dies, organic nitrogen accumulates in its tissues.
  9. The process of ammonification involves a variety of fungi and prokaryotes breaking down the tissue and releasing inorganic nitrogen as ammonia back into the environment.
  10. It releases inorganic nitrogen back into the ecosystem as ammonia.


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