The largest resevoir of nitrogen on earth is

Options

A. soil natrure (pH)
B. air
C. ocean
D. rocks

Answer

B

Explanation

Nitrogen is the fourth most prevalent element in living systems. It is available in the atmosphere in abundance (78% of atmosphere as dinitrogen of `N_(2)`) but plants cannot directly absorb the same. Nitrogen compounds are obtained from reservoir pool through nitrogen fixation.