Identify the free-living nitrogen fixing cyanobacterium.

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Azotobacter

Rhodospirillum

Anabaena

Beijerinckia

answer is C.

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Detailed Solution

The nitrogen-fixing microbes could be free-living or symbiotic. Examples of free-living nitrogen-fixing aerobic microbes are Azotobacter and Beijerinckia while Rhodospirillum is anaerobic and free-living. In addition, a number of cyanobacteria such as Anabaena and Nostoc are also free-living nitrogen-fixers.

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