Which of the following aquatic ferns is used | vedclass

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(B) $Azolla$ $pinnata$ is an aquatic fern that maintains a symbiotic relationship with the nitrogen-fixing cyanobacterium $Anabaena$ $azollae$. This c

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Azolla pinnata

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(B) $Azolla$ $pinnata$ is an aquatic fern that maintains a symbiotic relationship with the nitrogen-fixing cyanobacterium $Anabaena$ $azollae$. This cyanobacterium resides in the leaf cavities of the fern and fixes atmospheric nitrogen,which makes $Azolla$ an excellent biofertilizer,particularly in rice cultivation. It enriches the soil with nitrogen and improves crop yield.

Which of the following aquatic ferns is used as an excellent biofertilizer?

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