Which among the following is a free-living nitrogen-fixing anaerobic microbe?
Azotobacter
Rhizobium
Beijerinckia
Rhodospirillum

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Solution

The correct option is D Rhodospirillum
The free-living nitrogen-fixing aerobic microbes are Azotobacter and Beijerinckia while Rhodospirillum is anaerobic and free-living.

Rhizobium is a symbiotic biological nitrogen fixing microbe.

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