A symbiotic bacterium is

Nitrobacter

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Nitrosococcus

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Nitrocystis

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Rhizobium

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Solution

The correct option is A Rhizobium
Rhizobia are diazotrophic bacteria that fix nitrogen after becoming established inside the root nodules of legumes. Rhizobia are unique in that they are the only nitrogen-fixing bacteria living in a symbiotic relationship with legumes.

So, the correct answer is 'Rhizobium'.

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