Free living nitrogen fixing aerobic bacterium is

Rhodospirillum

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Anabaena

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Nostoc

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Beijerinckia

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Rhizobium

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Solution

The correct option is B Beijerinckia
Rhodospirillum is a free-living nitrogen-fixing anaerobic bacteria.
Anabaena & Nostoc are symbiotic nitrogen-fixing cyanobacteria.
Beijerinikia is free-living nitrogen-fixing aerobic bacteria.
Rhizobium is symbiotic nitrogen-fixing aerobic bacteria but fixes nitrogen in anaerobic conditions.
Hence the correct answer is D.

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