How many of the following organisms cannot fix the atmospheric nitrogen in a free living condition?
Frankia, Anabaena, Rhodospirillum, Beijernickia, Rhizobium, Azotobacter, Nostoc

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Solution

The correct option is A 2
Rhizobium, associated with leguminous plants and Frankia, associated with certain non-leguminous plants are symbiotic nitrogen fixing microbes. While Anabaena, Rhodospirillum, Beijernickia, Azotobacter, Nostoc are all free living nitrogen fixing microbes.

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Similar questions

N_{2}

	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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