Non-symbiotic nitrogen-fixation takes place by

Anabaena, Nostoc, Rhizobium

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Nostoc, Azotobacter, Clostridium

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Azotobacter, Nitrosomonas, Rhizobium

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Anabaena, Nitrosomonas, Pseudomonas

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Solution

The correct option is B Nostoc, Azotobacter, Clostridium
Nostoc is a free-living cyanobacterium. Azotobacter is obligate aerobic bacteria. Clostridium is anaerobic bacteria. All of them are free-living and fix nitrogen in the soil. They do not reside in the roots of the plant. They remain in the soil and convert the atmospheric nitrogen into the soluble form. Thus, the correct answer is option B.

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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

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