A) Multiplies very fast to produce massive biomass
B) Has association of nitrogen-fixing Rhizobium
C) Has association of nitrogenfixing cyanobacteria
D) Has association of mycorrhiza
Correct Answer: C
Solution :
Azolla is used as a biofertilizer because it has association of cyanobacterial members in their internal tissue. Cyanobacaterial members can fix atmospheric nitrogen.
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