Which of the following aquatic fern is an excellent bio fertilizer?

Salvinia

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Azolla

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Marsilea

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Pteridium

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Solution

The correct option is B Azolla
Azolla pinnata is an aquatic fern, which contains a nitrogen-fixing cyanobacteria. It contains Anabaena azollae in its leaf cavities. It is an excellent biofertilizer for paddy fields because they can fix nitrogen in moist condition also.
Thus, the correct answer is option B.

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