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Question

The aquatic fern which is an excellent biofertilizer is

A
Salvinia
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B
Azolla
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C
Pteridium
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D
Marsilea
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Solution

The correct option is B Azolla
Azolla pinnata is an aquatic plant, frond floating upon the surface of the water. It grows in quiet and slow-moving water bodies because swift currents and waves break up the plant. It is a good biofertilizer.
Pteridium aquilinum, also known as "eagle fern," is a species of fern occurring in temperate and subtropical regions in both hemispheres. It is not used as biofertilizer.
Marsilea is a genus of approximately 65 species of aquatic ferns of the family Marsileaceae. It is not used as biofertilizer.
Salvinia, a genus in the family Salviniaceae, is a floating fern named in honor of Anton Maria Salvini. It is not used as biofertilizer.
So, the correct answer is option B.

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