A) Nitrococcus, Nitrobacter, Nitrosomonas
B) Rhizobiurn, Aulosira, Bacillus, Polymyxa
C) Clostridium, Rhizobiurn, Nostoc
D) Anabaena, Nostoc, Azotobacter, Clostridium
Correct Answer: B
Solution :
Polymyxa is a member of protist (Protozoa) also called giant Amoeba which has no role in nitrogen fixation.
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