Multiple choice

Which of the following processes slows down in the presence of oxygen?

  1. Nitrogen-fixation in root nodule of legumes

  2. Respiration in human beings

  3. Burning of fossil fuels

  4. Formation of ozone
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A Correct answer
Explanation

Nitrogen fixation in legume root nodules is performed by bacteria like Rhizobium, which require oxygen-free conditions. The enzyme nitrogenase that fixes nitrogen is inhibited by oxygen. Respiration, combustion, and fossil fuel burning all require oxygen to proceed, while ozone formation involves oxygen reactions.

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