A free living anaerobic nitrogen fixer is (A) Beijernickia (B) Rhodospirillum (C) Rhizobium (D) Azotobacter

Rhodospirillum

Free-living nitrogen-fixing aerobic bacteria are Azotobacter and Beijerinckia and anaerobic bacteria is Rhodospirillum. Rhizobium and Frankia are symbiotic nitrogen fixers.

Hence, the correct option is (B)

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