Which of the following statements about the nitrogen cycle is correct?

Practice question

Question

Which of the following statements about the nitrogen cycle is correct?

Options

Choose one · Correct answer highlighted

Nitrogen fixation converts nitrogen gas into a usable form for plants. Correct Denitrification increases soil nitrogen levels. Plants can absorb nitrogen directly from the atmosphere. The nitrogen cycle does not involve bacteria.

Explanation

Nitrogen fixation by bacteria converts atmospheric nitrogen into ammonia, which can be used by plants.

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