Under the anaerobic conditions denitrifying bacteria, such as Pseudomonas could convert

Nitrates to nitrites

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Nitrates to molecular nitrogen

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Nitrites to nitrates

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Nitrates to ammonia

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Solution

The correct option is C Nitrates to molecular nitrogen
Pseudomonas are denitrifying bacteria and under anaerobic conditions convert nitrogen compounds present in soil like nitrates and ammonia into free gaseous nitrogen, thus recycling nitrogen back to atmosphere and completing the nitrogen cycle.

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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

Rhizobium lives as an aerobic microbe under free living conditions but gets adapted to anaerobic conditions during nitrogen fixation.

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