Which of the following is a non-symbiotic nitrogen fixing bacteria?

Rhizobium

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Azospirilium

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Azotobacter

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Nitrosomonas

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Solution

The correct option is C Azotobacter

Azotobacter is a bacteria which converts nitrogen gas into form by the process of nitrogen fixation. They do not reside inside the root nodules of the plant rather they exist freely in the soil. It is a diazotroph.So, the correct answer is option C.

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