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(D) $Azolla$ is a small aquatic fern that has a symbiotic relationship with the nitrogen-fixing cyanobacterium $Anabaena$ $azollae$. This cyanobacteri

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$Azolla$

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(D) $Azolla$ is a small aquatic fern that has a symbiotic relationship with the nitrogen-fixing cyanobacterium $Anabaena$ $azollae$. This cyanobacterium lives in the cavities of the $Azolla$ leaves. Because of this association,$Azolla$ is widely used as a biofertilizer in paddy fields. It fixes atmospheric nitrogen,which enhances the growth of rice plants and significantly increases the crop yield.

The aquatic fern which supports the growth of blue-green algae,$Anabaena$,and increases the yield of paddy crops is .......

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