The microorganism responsible for conversion of nitrates to gaseous nitrogen is

Nitrosomonas

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Nitrocystis

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Bacillus ramosus

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Micrococcus

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Solution

The correct option is D Micrococcus
The conversion of nitrates to gaseous nitrogen is carried out by denitrifying bacteria. Nitrosomonas is a chemoautotrophic bacteria that converts ammonia into nitrite. Thiobacillus denitrificans, Micrococcus denitrificans, and some species of Serratia, Pseudomonas, and Achromobacter act as denitrifiers and help in the process of denitrification. So, the correct option is 'Micrococcus'.

Suggest Corrections

Microorganism	Role in nitrogen cycle
(i)	Conversion of nitrate to free nitrogen
Nitrosococcus	(ii)
Nitrocystis	(iii)
(iv)	Conversion of free nitrogen to nitrogen compounds