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

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

One of the free-living anaerobic nitrogen-fixer is

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