Question
Azolla is used as a biofertilizer because it
multiplies very fast to produce massive biomass
has association of nitrogen - fixing Rhizobium
has association of nitrogen - fixing cyanobacteria
has association of mycorrhiza
Solution
C.
has association of nitrogen - fixing cyanobacteria
Azolla is a pteridophyte and used as a biofertilizer because it has association with nitrogenfixing cyanobacteria Anabaena azollae.
