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Which of the following genera the nitrifying bacteria doesn’t belong to?

(a) Nitrosomonas

(b) Nitrosococcus

(c) Nitrosospira

(d) Pseudomonas

I had been asked this question in an international level competition.

This interesting question is from Biological Treatment of Waste Water in portion Biological Treatment of Waste Water of Environmental Biotechnology

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Correct choice is (d) Pseudomonas

The explanation is: Nitrosomonas,  Nitrosococcus, Nitrosospira and Nitrosovibrio are various genera of nitrifying bacteria to which they belong, whereas pseudomonas is a different genus which is not involved in nitrification processes.

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