Multiple choice

Name the process by which percentage of nitrogen remains more or less constant in the atmosphere.

  1. Nitrogen fixation

  2. Nitrogen cycle

  3. Ammonification

  4. Denitrification

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B Correct answer
Explanation

 Nitrogen fixation is the process, which converts atmospheric nitrogen into nitrogen salts, ammonification refers to formation of ammonia from organic nitrogen, and denitrification refers to the conversion of nitrogen salts into atmospheric nitrogen back. To keep the percentage of nitrogen constant in the atmosphere, all these processes along with some other go simultaneously and the process in known as nitrogen cycle. 

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