343786
Which one of the following is active nitrogen fixer of rice fields?
1 Anabaena
2 Nostoc
3 Oscillatoria
4 All of them
Explanation:
In India, Aulosira fertilissima is regarded as the most active cyanobacteria for fixing nitrogen in rice or paddy fields. Anabaena: It can be both free-living & symbiotic also. Nostoc: It can be both free-living & symbiotic also.
