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Q.

Azolla is used as bio fertilizer as it has association with nitrogen fixing bacteria is

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a

Large quantity of humus

b

Rhizobium

c

Cyanobacteria

d

Mycorrhiza

answer is B.

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Detailed Solution

Azolla is a pteridophyte, which is used as a biofertilizer because it has association with N2 fixing cyanobacteria.

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