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

Azotobacter

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Nitrosomonas

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Rhizobium

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Pseudomonas

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Solution

The correct option is A Azotobacter
Free-living nitrogen-fixing microbes are :
• Azotobacter
• Beijernickia

So the correct option is "Azotobacter".

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