A) Nitrosomonas
B) Nitrobacter
C) Nitrosococcus
D) Rhizobium
Correct Answer: D
Solution :
Rhizobium bacteria has potential for nitrogen fixation. Rhizobium is a non-spore forming, non-motile and saprophytic Bacillus bacterium which is capable of growing in soil on decaying organic matter as well as in root nodules of legumes. Rhizobium provides usable form of nitrogen (fixed nitrogen) to legumes for their proper growth and development.
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