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 atmospheric nitrogen and make it available to Azolla. Azolla pinnata is an excellent bio-fertilizer for rice. Farmers may have reported 50% increase in yield of rice by using this bio-fertilizer.
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