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Q.

Identify the main nitrogen reservoir in biosphere.

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a

Organism

b

Rock

c

Ocean

d

Atmosphere

answer is C.

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Detailed Solution

Atmosphere is the main nitrogen reservoir in biosphere.
Composition of atmosphere is 78% nitrogen, 21% oxygen, and 1% consists of carbon dioxide, methane, argon, helium, water vapour and other gaseous components.

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