Rhizobium is:

Symbiotic and Gram negative bacterium

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Symbiotic and Gram positive bacterium

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Free living nitrogen fixing bacterium

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Parasitic and nitrogen fixing bacterium

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Solution

The correct option is A Symbiotic and Gram negative bacterium
Rhizobium is a group of Gram negative bacteria and symbiotically in relationship with various leguminous plants. Rhizobium bacteria can fix nitrogen from the air into ammonia, which acts as a natural fertilizer for plants.

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