Question

Match Column I with Column II

	Column I		Column II
(a)	Nitrococcus	(i)	Denitrification
(b)	Rhizobium	(ii)	Conversion of ammonia to nitrite
(c)	Thiobacillus	(iii)	Conversion of nitrite of nitrite
(d)	Nitrobacter	(iv)	Conversion of atmospheric nitrogen to ammonia

Choose the correct answer from the option given below

• A. (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
  
• B. (a) - (ii), (b) - (iv), (c) - (i), (d) - (iii)
• C. (a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)
• D. (a) - (iii), (b) - (i), (c) - (iv), (d) - (ii)

Answer 1

The correct option is B (a) - (ii), (b) - (iv), (c) - (i), (d) - (iii)

Nitrococcus is a bacterium that oxidises ammonia to nitrite.
The nitrite is further oxidised to nitrate by the bacterium Nitrobacter. The process is known as nitrification and the bacteria involved are known as nitrifying bacteria.

Rhizobium is a symbiotic nitrogen fixing bacterium that converts atmospheric nitrogen into ammonia in the roots of leguminous plants.

Thiobacillus is a denitrifying bacterium that reduces nitrate in the soil to nitrogen by a process called denitrification.