A nitrogen-fixing microbe associated with Azolla in rice fields is (a) Spirulina
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ANABAENA
Anabaena also referred to as Anabaena azollae.
Azolla is a free floating, fresh water fern (pteridophyte). Anabaena is a free living blue-green algae or cyanobacterium.
Sometimes, Anabaena is found in a symbiotic relationship with Azolla. Anabaena has nitrogenase enzyme present in it which helps in the process of Nitrogen Fixation.
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