A) Nitrosomonas
B) Rhizobium
C) Assotobacter
D) Pseudomonas
Correct Answer: C
Solution :
The genus Azotobacter comprises large, free living, Gram negative, obiigately aerobic, rod shaped bacteria which are capable for fixation of nitrogen non-symbiotically. Rhizobium is a symbiotic nitrogen fixing bacteria, Nitrosomonas is a nitrifying bacteria, while Pseudomonas sp. is denitrifying bacteria.
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