Which of the following is a symbiotic Nitrogen fixing bacteria?

Nostoc

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Rhizopus

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Rhizobium

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Cyanobacteria

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Solution

The correct option is C Rhizobium
Nostoc, Cyanobacteria are free living microorganisms that perform nitrogen fixation.
Rhizopus is a fungi, not a bacteria, and is well known as bread mould.
Rhizobium is the nitrogen fixing bacteria that lives in a symbiotic relation with roots of leguminous plants.

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