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Q. N2 content is kept constant in the biosphere due to

  • (A) N2 fixation
  • (B) industrial pollution
  • (C) nitrogen cycle
  • (D) absorption of N2
  • Correct Answer - Option(C)
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Explanation by: Admin

The nitrogen cycle is responsible for maintaining the N₂ content in the biosphere. It involves several processes:

1. Nitrogen Fixation – Conversion of atmospheric N₂ into ammonia (NH₃) by nitrogen-fixing bacteria (e.g., Rhizobium, Azotobacter).


2. Nitrification – Conversion of ammonia to nitrites (NO₂⁻) and then to nitrates (NO₃⁻) by nitrifying bacteria.


3. Assimilation – Plants absorb nitrates from the soil and use them to make proteins.


4. Ammonification – Decomposition of organic matter releases ammonia.


5. Denitrification – Conversion of nitrates back to nitrogen gas (N₂) by denitrifying bacteria (e.g., Pseudomonas), returning it to the atmosphere.

 

This cycle ensures that nitrogen levels remain balanced in the biosphere.

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