. Azolla is used as a biofertilizer because it

A: Multiplies very fast to produce massive biomass

B: Has association of nitrogen - fixing Rhizobium

C: Has association of nitrogen - fixing cyanobacteria

D: Has association of mycorrhiza

Best Answer

Explanation

Azolla is used as a biofertilizer because it has an association with nitrogen-fixing cyanobacteria.
Cyanobacteria possess a symbiotic relationship with the roots, hence these roots in comparison to legumes can fix more than 3 times atmospheric nitrogen.

Final Answer

Hence option C: Has association of nitrogen - fixing cyanobacteria is the correct option.

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