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UPCAT Science practice question 12: Atmospheric nitrogen is converted into a form usable by plants mainly through the action of

Correct answer

C. certain bacteria

Nitrogen-fixing bacteria, including Rhizobium in legume root nodules, reduce atmospheric N₂ into ammonia that plants can assimilate.

Atmospheric nitrogen is converted into a form usable by plants mainly through the action of

  1. fungal spores
  2. sunlight on leaf surfaces
  3. certain bacteriaCorrect
  4. earthworms in the soil

Why C is correct

Nitrogen-fixing bacteria, including Rhizobium in legume root nodules, reduce atmospheric N₂ into ammonia that plants can assimilate.

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