Azolla is used as a biofertilizer because it
A. multiplies very fast to produce massive bio
B. has association of nitrogen-fixing Rhizobium
C. has association of nitrogen-fixing cyanobacteria
D. has association of Mycorrhiza
Answer:C
Azolla is used as a biofertilizer because it
A. multiplies very fast to produce massive bio B. has association of nitrogen-fixing Rhizobium C. has association of nitrogen-fixing cyanobacteria D. has association of Mycorrhiza