Azotobacter and Beijerinckia are the examples of

symbiotic nitrogen-fixers

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non-symbiotic nitrogen-fixers

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ammonifying bacteria

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disease causing bacteria

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Solution

The correct option is B non-symbiotic nitrogen-fixers
Azotobacter and Beijerinckia are examples of free-living nitrogen-fixing aerobic microbes. Since they are free-living, they are non-symbiotic in nature.
Rhizobium is an example of symbiotic nitrogen fixer.
Proteus and Pseudomonas are examples of ammonifying bacteria.
Mycobacterium is an example of a disease causing bacteria.

Suggest Corrections

	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