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Question

Which of the following bacterium causes denitrification?

A
Azotobacter
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B
Nitrobacter
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C
Nitrosomonas
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D
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.
2NO32NO22NON2ON2
The released N_2 escapes into the atmosphere.

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