Azolla is useful as green manure for

Wheat

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Rice

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Maize

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Coconut

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Solution

The correct option is B Rice
Azolla belongs to the family of Salviniaceae. It is an aquatic fern which remains in symbiotic association with the Anabena and helps in fixation of nitrogen. It provides the cyanobacteria with a safe environment in exchange for nitrogen. It is used as a green manure during cultivation of rice to increase the efficiency of rice.
So, the correct answer is option B.

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