A non-photosynthetic aerobic nitrogen fixing soil bacterium is

Rhizobium

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Clostridium

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Azotobacter

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Klebsiella

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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. Azotobacter are free-living non-photosynthetic aerobic nitrogen fixing soil bacteria. It is used as a biofertilizer for cultivating many crops. Rhizobium is symbiotic nitrogen-fixing bacteria.
Thus, the correct answer is 'Azotobacter.'

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