A free living aerobic and non-photosynthetic nitrogen fixing bacterium is

Anabaena

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Clostridium

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Azotobacter

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Rhizobium

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Solution

The correct option is C Azotobacter
The atmospheric nitrogen is not available to plants. There are some nitrogen fixing bacteria which converts atmospheric nitrogen into ammonia which is readily available to plants. Anabaena is a free-living as well as symbiotic nitrogen fixing bacteria. Clostridium is a free-living, anaerobic nitrogen fixing bacteria. Azotobacter are free-living, aerobic, and non-photosynthetic nitrogen fixing bacteria. Rhizobium is non free living symbiotic nitrogen fixing bacteria.
Thus, the correct answer is 'Azotobacter.'

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