Which of the following bacteria has potential for nitrogen fixation?

Nitrosomonas

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Nitrobacter

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Nitrosococcus

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Rhizobium

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Solution

The correct option is D Rhizobium
Rhizobium is a genus of gram-negative soil bacteria that fix nitrogen. Rhizobium forms an endosymbiotic nitrogen fixing association with roots of legumes. The bacteria colonize plant cells within root nodules; here the bacteria convert atmospheric nitrogen to ammonia which acts as a natural fertilizer for the plants. Rhizobium forms a symbiotic relationship with legumes.
Therefore, the correct answer is option D.

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