Q. Yield of rice is enhanced by :
- Azolla
- Anabaena
- Nostoc
- Clostridium
Solution :
Correct option : A The Azolla enters into symbiotic association with a nitrogen fixing bacteria known as Anabaena. It is used as a biofertilizer to enhance crop yield in a rice-wheat cropping system. It is a small aquatic fern, that can be used as a green manure for irrigated rice before the transplanting of rice and under the rice crop.
So, the correct answer is ‘Azolla’
