A nitrogen fixing microbe associated with Azolla in rice fields is

Frankia

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Nostoc

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Rhizobium

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Anabaena

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Solution

The correct option is D Anabaena
Azolla is an aquatic pteridophyte commonly found in rice fields. Azolla harbors blue-green alga Anabaena, which fixes atmospheric nitrogen and suppress the weeds when the fields are flooded during the spring.
So, the correct answer is option D.

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