Multiple choice

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

  1. Nitrogen fixation in root nodules of legumes

  2. Respiration in human beings

  3. Burning of fossil fuels

  4. Formation of ozone
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A Correct answer
Explanation

Oxygen is necessary for every form of life and processes which they perform. But, some forms of life, especially bacteria, are poisoned by elemental oxygen. For example, the process of nitrogen fixation by nitrogen-fixing bacteria also takes place in the absence of oxygen and slows down in the presence of oxygen.

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