Which of the following is an aquatic and free | vedclass

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(D) $Azolla$ and $Salvinia$ are true aquatic ferns.$Azolla$ is used as a biofertilizer because it contains the nitrogen-fixing cyanobacterium $Anabaen

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Both $(A)$ and $(B)$

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(D) $Azolla$ and $Salvinia$ are true aquatic ferns.$Azolla$ is used as a biofertilizer because it contains the nitrogen-fixing cyanobacterium $Anabaena$ in its leaves.$Salvinia$ is an aquatic weed and is commonly known as the 'Sorrow of Kashmir'.

Which of the following is an aquatic and free-floating fern?

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