One of the free living anaerobic nitrogen fixer is

Rhodospirillium

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Rhizobium

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Azotobacter

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Beijerinckia

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Solution

The correct option is B Rhodospirillium
Atmospheric nitrogen is not available to plants. There are nitrogen fixing bacteria which converts atmospheric nitrogen into ammonium compounds and make it available to the plants. Rhodospirillium is a free living anaerobic nitrogen fixer. Rhizobium is a symbiotic nitrogen fixer. It lives in symbiotic association with the legumes. Azotobacter and Beijerinckia are free-living aerobic nitrogen fixer.
Thus, the correct answer is 'Rhodospirillium.'

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