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One of the free -living, anaerobic nitrogen - fixer is :
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- Beijernickia
- Rhodospirillum
- Rhizobium
- Azotobacter
Correct Option: B
Rhodospirillum is a free-living, anaerobic nitrogen fixer bacteria. It can synthesize its food in presence of light under anaerobic conditions. Beijernickia and Azotobacter are free living aerobic nitrogen fixing bacteria. Rhizobium is a symbiotic nitrogen fixing bacteria.