Azolla is used as biofertilizer because it

Form massive biomass

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Has association of nitrogen fixing Rhizobium

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Possesses association with nitrogen fixing cyanobacteria

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Has association with mycorrhiza

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Solution

The correct option is C Possesses association with nitrogen fixing cyanobacteria
Biofertilisers are the organisms that enrich soil nutrient quality. Azolla is used as a biofertilizer because it possesses a symbiotic association with Nitrogen fixing cyanobacteria.

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