The $N_{2}$ fixing bacterium associated with root nodules of legumes is known as

Azotobacter

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Nitrobacter

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Lactobacillus

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Rhizobium

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Solution

The correct option is D Rhizobium
Rhizobium is microaerophilic rod shaped gram negative bacteria found in association with legume plants in root nodules. These bacteria fix atmospheric nitrogen into ammonium ions, which can be readily assimilated by plants.

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Name the bacterium capable of nitrogen fixation which resides in the root nodules of legumes.

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