Which of the following is responsible for adding nitrogen to atmosphere?
I. Denitrifying bacteria
II. Industrial fertilizer production
III. Lightning
IV. Nitrogen-fixing bacteria

I and II only

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II only

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II and III only

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I only

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I, II, III, and IV

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Solution

The correct option is B I only
Denitrification bacteria carryout the first step in returning nitrogen back to the atmospheric reservoir. They reduce the nitrates into nitrite thereby removing nitrogen from soil. Rest mentioned options help in fixation of atmospheric nitrogen in biologically available form.
Therefore, the correct answer is option D.

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Which of the following is responsible for adding nitrogen to atmosphere?I. Denitrifying bacteriaII. Industrial fertilizer productionIII. LightningIV. Nitrogen-fixing bacteria

Which of the following is responsible for adding nitrogen to atmosphere?
I. Denitrifying bacteria
II. Industrial fertilizer production
III. Lightning
IV. Nitrogen-fixing bacteria