Which of the following is not a nitrogen fixing cyanobacteria?

Anabaena

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Azotobacter

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Nostoc

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Oscillatoria

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Solution

The correct option is B Azotobacter
Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environment many of which can fix atmospheric nitrogen. Anabaena, Nostoc and Oscillatoria are nitrogen fixing cyanobacteria (Blue Green algae) while Azobacter and Azospirillum are nitrogen fixing free living bacteria.

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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

	List I		List II
A	$A z o s p i r i l l u m$ and $A z o t o b a c t e r$	1	Free living nitrogen fixing bacteria
B	$G l o m u s$	2	Biological control tools
C	$A n a b a e n a$ and $N o s t o c$	3	Forms mycorrhiza
D	$N u c l e o p o l y h e d r o$ $v i r u s$	4	Symbiotic cyanobacteria

	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

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