Which of the aquatic fern is used to increase the yield in paddy crop?

Azolla

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Salvinia

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Marsilea

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Isoetes

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Solution

The correct option is A Azolla
Azolla or water fern is a species of aquatic ferns of the family Salviniaceae and resembles mosses. It is involved in symbiotic nitrogen fixation. The nitrogen fixing capability of Azolla has made it an ecologically important bio fertiliser in the paddy fields to increase the yield.
So, the correct answer is option A.

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