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The aquatic fern, which is an excellent biofertiliser is

1. Azolla
2. Salvinia
3. Marsilia
4. Pteridium

Correct answer: Azolla

Solution

Azolla is an aquatic fern known for its symbiotic association with nitrogen-fixing Anabaena, which makes it an excellent biofertiliser. The other options are ferns, but they are not widely used for this purpose.

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