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Question

Denitrification is carried out by

A
Nitrosomonas
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B
Nitrosococcus
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C
Nitrobacter
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D
Pseudomonas
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Solution

The correct option is D Pseudomonas
Denitrification i.e. conversion of fixed nitrates back into the atmospheric nitrogen is carried out by denitrifying bacteria e.g., Pseudomonas
While Nitrosomonas and Nitrococcus convert ammonia into nitrites and Nitrobacter converts nitrites to nitrates.
Thus, the correct answer is D.

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