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

Pseudomonas

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Rhizobium

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Azotobacter

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Nitrosomonas

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Solution

The correct option is D Azotobacter
Azotobacter has a wide variety of metabolic abilities, including the unusual ability to fix atmospheric nitrogen as they produce nitrogenase enzyme and convert it to ammonia. They are free living in soil and do not associate as symbionts.

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