Select the matched ones:

(1)Nitrosomonas - Nitrite to nitrate

(2)Thiobacillus - Denitrification

(3)Nostoc– Free - living nitrogen-fixer

(4)Azotobacter - Anaerobic nitrogen-fixer

a and b only

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c and d only

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b and c only

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b and d only

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Solution

The correct option is C
b and c only

Nitrosomonas - Ammonium to nitrate
Thiobacillus - Denitrification
Nostoc - Free-living nitrogen-fixer
Azotobacter - Aerobic nitrogen-fixer

Suggest Corrections

(a)	Nitrobacter	(i)	Free living aerobic nitrogen fixer
(b)	Clostridium	(ii)	Converts ammonia into nitrite
(c)	Nitrosococcus	(iii)	Changes nitrite to nitrate
(d)	Azotobacter	(iv)	Free living anaerobic nitrogen fixer