Which of the following is common to Azospirillum, Azotobacter, Anabaena, Nostoc and Oscillatoria?

Prokaryotes

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Nitrogen-fixers

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Eukaryotes

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(a) and (b)

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Solution

The correct option is D (a) and (b)
Azospirillum, Azotobacter, Anabaena, Nostoc and Oscillatoria are all nitrogen fixing bio fertilizers. They are all prokaryotes.
Azospirillum and Azotobacter are free living bacteria whereas Anabaena, Nostoc and Oscillatoria are cyanobacteria.

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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

N_{2}

Select the matched ones:

(1)Nitrosomonas - Nitrite to nitrate

(2)Thiobacillus - Denitrification

(3)Nostoc– Free - living nitrogen-fixer

(4)Azotobacter - Anaerobic nitrogen-fixer

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