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

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Cyanobacteria in Azolla pinnata (fern)

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(C) $Azolla$ is a small aquatic fern that has a symbiotic relationship with the nitrogen-fixing cyanobacterium $Anabaena$ $azollae$. This cyanobacterium lives in the leaf cavities of $Azolla$. When $Azolla$ is grown in rice fields,it acts as a biofertilizer by fixing atmospheric nitrogen,which significantly increases the availability of nitrogen to the rice plants. Studies have shown that the use of $Azolla$ as a biofertilizer can increase rice production by up to $50\%$.

Modern farmers have been able to increase rice production by about $50\%$ by using which of the following?

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