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Q.

The main nitrogen reservoir in the biosphere is the
 

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a

rocks
 

b

atmosphere
 

c

ocean
 

d

organism

answer is C.

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Detailed Solution

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  • The biggest nitrogen source on the planet is air. 
  • Nitrogen is mostly found in the atmosphere as a gas. 
  • The nitrogen form is inert and cannot be used by any living form, so it must be transformed into usable forms. 
  • The composition of the air is 78% nitrogen, 21% oxygen and the remaining 1% is made up of all other gases such as carbon dioxide, argon, etc.
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