Multiple choice

The bulk of nitrogen in nature is fixed by

  1. chemical industries

  2. symbiotic bacteria

  3. lightning discharge

  4. denitrifying bacteria
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biological nitrogen fixation, particularly by symbiotic bacteria like Rhizobium in legume nodules, accounts for the vast majority of nitrogen fixed in nature. This process far exceeds the amounts fixed by lightning or industrial processes.

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