A) Marsilea
B) Azolla
C) Pteridium
D) Salvinia
Correct Answer: B
Solution :
Nitrogen fixing cyanobacteria form symbiotic association with several plants as Cycas, Azolla. Azolla is an aquatic fern. It contain Anabaena in its leaf, which fixes atmospheric nitrogen. Therefore, Azolla is being used as biofertilizer in paddy field. Salvinia and Marsilia are also aquatic fem, but are not used so.
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