Azotobacter and Beijerinckia are examples of

Symbiotic nitrogen fixers

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Disease causing bacteria

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Ammonifying bacteria

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Non-symbiotic nitrogen fixers

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Solution

The correct option is D
Non-symbiotic nitrogen fixers

Azotobacter and Beijerinckia are free-living species (non-symbiotic) of bacteria which can fix nitrogen in the rhizosphere of several plants.

Suggest Corrections

	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