Which one of the following is denitrifying bacteria?

Nitrosomonas

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Pseudomonas

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Azotobacter

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Nostoc

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Solution

The correct option is B Pseudomonas
Denitrifying bacteria are those microorganisms which convert nitrates present in the soil to free atmospheric nitrogen. They decrease the soil fertility and reduce agricultural productivity. For example, Thiobacillus denitrificans, Micrococcus denitrificans, Serratia, Pseudomonas, etc.
Thus, the correct answer is option B.

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Comment on the following :

(a) Denitrifying bacteria are a blessing as well as a curse to farmers.

(b) Yeast is used in bakeries and breweries.

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