Answer :

Nitorgen is replenished in atmosphere by nitrogen cycle.

It is a process by which nitrogen is converted into various chemical forms and is made available to living organisms.


Nitrogen fixation takes place by the action of microbes, inert nitrogen breaks down in the air and combines with oxygen to form nitrous oxide.


Nitrifying bacterias in the soil take up this atmospheric nitrogen and make it available for plants. Plants get this nitrogen.


Later when they decay, the nitrogen is returned back into the environment. In the soil there are some denitrifying bacterias too, they break down nitrate and release nitrogen into the atmosphere thus replenishing nitrogen in the atmosphere.


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