A free-living anaerobic nitrogen-fixer is:

Azotobacter

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Beijerinckia

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Rhodospirillum

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Rhizobium

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Solution

The correct options are
A
Azotobacter

C
Rhodospirillum

Two kinds of nitrogen-fixing bacteria are recognized. The first kind, the free-living(nonsymbiotic) bacteria, includes the cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium

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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

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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