Nitrogen cycle in nature · NCERT Biology

The process of conversion of atmospheric nitrogen ($N_2$) to ammonia ($NH_3$) is termed as:

  1. Nitrification
  2. Denitrification
  3. N2 fixation
  4. Ammonification
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Correct answer: N2 fixation

Nitrogen fixation is the first step of the nitrogen cycle where stable atmospheric nitrogen is converted into ammonia. This can occur through biological, industrial, or electrical (lightning) processes.

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