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Q.
Which is the most efficient free nitrogen fixer cyanobacterium in field of rice?
BVP MedicalBVP Medical 2013
Solution:
Anabaena, Nostoc, Aulosira and Tolypothrix are free living nitrogen fixing cyanobacteria. Out of them Aulosira is the most efficient cyanobacterium which fix atmospheric nitrogen efficiently in rice field. Recent discoveies have proved it.