Which among the following is a free-living nitrogen-fixing anaerobe?

Azotobacter

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Beijerinckia

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Rhodospirillum

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All of these

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Solution

The correct option is C Rhodospirillum
Rhodospirillum is an anaerobic free living nitrogen fixing microbe.
Azotobacter and Beijerinckia are aerobic nitrogen fixing microbes.
Aerobic microbes require oxygen for their growth and activity while anaerobic microbes do not require oxygen .

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