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The aquatic fern which is an excellent b...

The aquatic fern which is an excellent biofertilizer is

A

Azolla

B

Salvinia

C

Marsilia

D

Pteridium

Text Solution

Verified by Experts

The correct Answer is:
A
Azolla is a floating pteridophyte which contains as endosymbiont the nitrogen fixing cyanobacterium anabaena. Azolla is either incorporated into the soil before rice transplanting or grown as a dual crop along with rice.
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