Which of the following bacterium causes denitrification?

Azotobacter

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Nitrobacter

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Nitrosomonas

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Pseudomonas

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Solution

The correct option is D Pseudomonas
Some of the nitrates present in the soil is reduced to gaseous nitrogen by the action of microorganisms. This process is called denitrification.
Denitrification is caused by bacteria Pseudomonas denitrificans and Thiobacillus denitrificans.
$2 N O_{3}^{-} \to 2 N O_{2}^{-} \to 2 N O \to N_{2} O \to N_{2}$
The released N_2 escapes into the atmosphere.

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