Question

In nodules on the roots of leguminous plants,
nitrogen is fixed by :
(a) rhizobium (b) azospirillum
(c) azotobacter (d) None of these

Answer 1

Answer:

Rhizobium is the right answer

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Answer 2

Nitrogen fixation:

• Option “A” is correct i.e. Rhizobium

• In nodules on the root of leguminous plants, nitrogen is fixed by rhizobium.

• Rhizobia are diazotrophic bacteria that fix nitrogen after becoming recognized in the root nodules of leguminous plants. To express genes for nitrogen fixation, rhizobia need a plant host; they cannot individually fix nitrogen. In common, they are gram-negative, motile, and non-sporulating rods.

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