The aquatic fern which is an excellent biofertilizer is [CBSE PMT 1999 – McqOptions

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1.	The aquatic fern which is an excellent biofertilizer is [CBSE PMT 1999, 2001]
A.	Azolla
B.	Salvinia
C.	Marsilia
D.	Pteridium
Answer» B. Salvinia

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