Azotobacter and Bacillus polymyxa are

Decomposers

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Non-symbiotic nitrogen fixers

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Symbiotic nitrogen fixers

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Pathogenic bacteria

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Solution

The correct option is B Non-symbiotic nitrogen fixers
Azotobacter and Bacillus polymyxa are non-symbiotic nitrogen fixers.
Rhizobium is an example for symbiotic nitrogen fixer.
Staphylococcus aureus, Sreptococcus pyogenes are pathogenic bacteria.
Fungi are classical examples of decomposers.
So, the correct answer is 'Non-symbiotic nitrogen fixers'

Suggest Corrections

	List I		List II
A	$A z o s p i r i l l u m$ and $A z o t o b a c t e r$	1	Free living nitrogen fixing bacteria
B	$G l o m u s$	2	Biological control tools
C	$A n a b a e n a$ and $N o s t o c$	3	Forms mycorrhiza
D	$N u c l e o p o l y h e d r o$ $v i r u s$	4	Symbiotic cyanobacteria