A) nitrifying bacteria
B) methanobacteria
C) diazotrophic bacteria
D) denitrifying bacteria
Correct Answer: D
Solution :
Certain anaerobic bacteria, which include some species of Pseudomonas, Moraxella, Spirillum, Thiobacillus and Bacillus are able to reduce nitrates to nitrites, nitrites to nitrous oxide gas \[({{N}_{2}}O)\] and subsequently to molecules nitrogen. This conversion of nitrates to \[{{N}_{2}}O\] or \[{{N}_{2}}\] is called denitrification. Soil fertility is greatly reduced because of the depletion of nitrogen available to plants.
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