A) Azolla
B) Salvinia
C) Pteris
D) Both (a) and (b)
Correct Answer: D
Solution :
Azolla and Salvinia are true aquatic ferns. Azolla is used as biofertilizer because of having nitrogen fixing cyanobacterium, Anabaena in leaves. Salvinia is an aquatic weed and called sorrow of Kashmir.
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