Azolla is used as a biofertilizer because it

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(C) The leaves of Azolla (a water fern) contain cavities that harbor the nitrogen-fixing cyanobacterium $Anabaena \ azollae$.This symbiotic associatio

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Has association of nitrogen-fixing cyanobacteria

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(C) The leaves of Azolla (a water fern) contain cavities that harbor the nitrogen-fixing cyanobacterium $Anabaena \ azollae$.This symbiotic association allows the fern to fix atmospheric nitrogen,which is then made available to the plant and the soil.$Azolla \ pinnata$ is widely used as an excellent biofertilizer,particularly in rice cultivation.Farmers have reported up to a $50 \%$ increase in rice yield by using this biofertilizer.

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