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12. Nitrogen is an essential element for living organism. The cycling of nitrogen through the ecosystem...

12. Nitrogen is an essential element for living organism. The cycling of nitrogen through the ecosystem is complex. Further, not all forms of nitrogen are usable by living organism.

b) Where is most of the nitrogen in the nitrogen cycle?

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12b. Nitrogen cycle refers to the conversion of nitrogen into usable forms by the living organisms that are distributed among the atmosphere and various ecosystems. The phenomenon is of utmost importance, as different ecological, cellular and molecular events depend on the availability of nitrogen.

The most abundant form of nitrogen is present as inorganic nitrogen (N2) in the atmosphere (78%), that as such is in the unusable form for most of the living organisms. The overall process of conversion of atmospheric nitrogen into nitrates and nitrites through different industrial and biological processes is called nitrogen fixation.

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