Nitrogen fixing microbe associated with Azolla in rice fields is

Frankia

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Tolypothrix

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Spirulina

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Anabaena

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Solution

The correct option is D Anabaena
Anabaena is heterocyst-forming, photoautotrophic cyanobacteria that perform oxygenic photosynthesis. Anabaena grows in long filaments of vegetative cells. It is also used for nitrogen fixation.
So, the correct option is 'Anabaena'.

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