Which of the following fern is a biofertilizer ........

Agriculture and Rural Development (Phase-I/II) sustainable Agriculture

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Which of the following fern is a biofertilizer?

Salvinia

Azolla

Pteridium

Marsilea

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Explanation:

Azolla (mosquito fern, duckweed fern, fairy moss, water fern) is a genus of seven species of aquatic ferns in the family Salviniaceae. They are extremely reduced in form and specialized, looking nothing like other typical ferns but more resembling duckweed or some mosses.