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(B) The aquatic fern $Azolla$ lives in a symbiotic relationship with the cyanobacterium $Anabaena$ $azollae$.This cyanobacterium resides in the leaf c

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Anabaena

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(B) The aquatic fern $Azolla$ lives in a symbiotic relationship with the cyanobacterium $Anabaena$ $azollae$.This cyanobacterium resides in the leaf cavities of $Azolla$.It fixes atmospheric nitrogen and provides it to the fern,while the fern provides shelter and nutrients to the cyanobacterium.This association is widely used as a biofertilizer in paddy fields to enhance nitrogen content in the soil.

Which nitrogen-fixing microorganism is associated with Azolla in paddy fields?

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