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
Correct Answer: C
Solution :
The leaves of Azolla (fern) have as many as 80,000 blue-green algae belonging to Anabaena azollae which have the capacity to fix atmosphere nitrogen and make it available to Azolla. Azolla pinnata is an excellent biofertilizer for rice. Farmers may have reported 50% increase in yield of rice by using this biofertilizer.
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