Aquatic fern which is an excellent biofertilizer is

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

Biofertilizers are organisms that enrich the nutrient quality of the soil. The main source of biofertilizers are bacteria, fungus, and cyanobacteria. Symbiotic cyanobacteria Anabaena azollae fixes nitrogen in the leaves of Azolla ( aquatic fern ). Azolla pinnata ( a pteridophyte ) is used as an excellent biofertilizer in the rice field.
So, the correct answer is 'Azolla'

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