What does the nitrogen cycle represents?

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Please find below the answer:

Organisms require nitrogen to produce amino acids. Nitrogen makes up 70% of the atmosphere, but most organisms can not use this form of nitrogen and must have a fixed form. Thus nitrogen cycle is important as it produces the fixed form of nitrogen these organisms need. It represents a cyclical transformation of atmospheric nitrogen into forms that can be absorbed by plants.

 Step 1: The nitrogen-fixing bacteria take atmospheric nitrogen and produce ammonia (NH₃).

Step 2: Other bacteria use this ammonia to produce nitrates and nitrites, which are nitrogen and oxygen-containing compounds.

Step 3: The nitrates and nitrites are used by plants to make amino acids which are then used to make plant proteins.

Step 4: Plants are consumed by other organisms which use the plant amino acids to make their own.

Step 5: Decomposers convert the nitrogen found in other organisms into ammonia and return it to the soil. A few of these types of bacteria return nitrogen to the atmosphere by a process called denitrification, however this amount is small.

Hope this information clears your doubt.
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