A free living anaerobic nitrogen fixer is

Rhodospirillum

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Rhizobium

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Azotobacter

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Beijernickia

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Solution

The correct option is D Rhodospirillum
There are basically two types of nitrogen-fixing bacteria, free-living and symbiotic bacteria. Rhodospirillum is free-living, anaerobic nitrogen fixer. Both Beijerinckia and Azotobacter are free-living, aerobic nitrogen fixer. Rhizobium is a symbiotic, nitrogen fixer.
Thus, the correct answer is option A.

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