Which of the following is a free living aerobic nitrogen fixing bacterium present in the soil?

Nitrosomonas

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Rhizobium

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Azotobacter

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Pseudomonas

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Solution

The correct option is C Azotobacter
Azotobacter and Beijerinckia are aerobic free living saprophytic nitrogen fixing bacteria, while Clostridium is anaerobic free living saprotrophic nitrogen fixing bacterium.

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