Most of Earth's nitrogen is in

Biology Ecosystem Decomposition Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 21, 2026

the atmosphere

the oceans.

fresh water.

soil.

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The correct answer is:

Nitrogen is extremely abundant in the atmosphere — about 78% of the air is nitrogen gas (N₂). However, most organisms cannot use this form directly; it must be fixed into usable compounds by bacteria.

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