Choose the odd one out among the following with respect to nitrogen fixation.

Bacillus anabaena

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Rhizobium

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Azotobacter

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Pseudomonas

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Solution

The correct option is D
Pseudomonas

Pseudomonas is a denitrifying bacterium.

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Similar questions

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

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