Question

The aquatic fern which is an excellent biofertilizer is

• A. Salvinia
• B. Azolla
• C. Pteridium
• D. Marsilea

Answer 1

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.