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Question

Which of the following microorganism is involved in nitrogen fixation?


  1. Rhizobium
  2. Aspergillus
  3. Chlamydomonas
  4. Spirogyra


Solution

The correct option is A Rhizobium
Rhizobium is a nitrogen fixing bacterium, usually found in the root nodules of leguminous plants. This bacterium and leguminous plants are in a symbiotic relationship with each other. The nitrogen fixed by the bacteria is utilised by the plant and in turn Rhizobium receives nourishment and shelter from the plant.

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