Zoology - Microbes in Human Welfare Question with Solution | TestHub

The leaves ofAzolla (fern) have as many as 80,000 blue-green algae belonging toAnabaena azollae, which have the capacity to fix atmospheric nitrogen and make it available toAzolla.Azolla pinnatais an excellent biofertilizer for rice. Farmers may have reported 50% increase in yield of rice by using this biofertilizer.