An excellent biofertilizer in aquatic fern is [[1]]

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answer is AZOLLA.

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Detailed Solution

Concept: Azolla is an excellent bio-fertilizer. It is an aquatic fern in the family Salviniaceae. They are extremely reduced in form.
They form a symbiotic relationship with the cyanobacterium Anabaena azollae, which fixes the atmospheric nitrogen, giving the plant access to the essential nutrient.
Hence, the correct Option is Azolla.

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