Denitrification is carried by bacteria:

Nitrosomonas and Nitrococus

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Nitrobacter and Nitrococus

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Pseudomonas and Thiobacillus

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Beijernikia and Azotobacter

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Solution

The correct option is C Pseudomonas and Thiobacillus
Denitrification i.e., conversion of fixed nitrates back into the atmospheric nitrogen is carried out by denitrifying bacteria such as Pseudomonas and Thiobacillus. While Nitrosomonas and Nitrococcus convert ammonia into nitrites and Nitrobacter converts nitrites to nitrates.
Beijernikia and Azotobacter are free-living nitrogen-fixing microbes.

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Similar questions

	I		II
a	Free living aerobic nitrogen fixers	1	Anabaena and Nostoc
b	Anaerobic nitrogen fixers	2	Pseudomonas denitrificans and Thiobacillus denitrificans
c	Nitrogen fixing cyanobacteria	3	Nitrosomonas and Nitrococcus
d	Denitrifying bacteria	4	Azotobacter and Beijerinckia
e	Nitrifying bacteria	5	Rhodospirillum

	I		II
(a)	Free-living aerobic nitrogen fixers	1.	Anabaena and Nostoc
(b)	Anaerobic nitrogen fixers	2.	Pseudomonas and Thiobacillus
(c)	Nitrogen-fixing cyanobacteria	3.	Nitrosomonas and Nitrosococcus
(d)	Denitrifying bacteria	4.	Azotobacter and Beijerinckia
(e)	Nitrifying bacteria	5.	Rhodospirillum

	I		II
p	Thiobacillus denitrificans	i	Nitrogen fixation
q	Nitrosomonas	ii	Ammonification
r	Azotobacter	iii	Nitrification
s	Bacillus vulgaris	iv	Denitrification

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