Match Column - I with Column - II. List-I List-II (a) Nitrococcus (i) Denitrification (b) Rhizobium (ii) Conversion of ammonia to nitrite (c) Thiobacillus (iii) Conversion of nitrite to nitrate (d) Nitrobacter (iv) Conversion of atmospheric nitrogen to ammonia Choose the correct answer from options given below.

Question

Match Column - I with Column - II. List-I List-II (a) Nitrococcus (i) Denitrification (b) Rhizobium (ii) Conversion of ammonia to nitrite (c) Thiobacillus (iii) Conversion of nitrite to nitrate (d) Nitrobacter (iv) Conversion of atmospheric nitrogen to ammonia Choose the correct answer from options given below., ( a ) - ( ii ) ; ( b ) - ( iv ) ; ( c ) - ( i ) ; ( d ) - ( iii ), ( a ) - ( i ) ; ( b ) - ( ii ) ; ( c ) - ( iii ) ; ( d ) - ( iv ), ( a ) - ( iii ) ; ( b ) - ( i ) ; ( c ) - ( iv ) ; ( d ) - ( ii ), ( a ) - ( iv ) ; ( b ) - ( iii ) ; ( c ) - ( ii ) ; ( d ) - ( i )

MARKS App · Accepted Answer

(a) - (ii). In the process of nitrogen fixation, first ammonia is converted into nitrite. This is accomplished by the bacteria Nitrosomonas and Nitrococcus . (b) - (iy). One of the most important symbiotic bacterium, Rhizobium , remains associated with the roots of leguminous plants. They help in the conversion of atmospheric nitrogen into ammonia. (c) - (i). Denitrification is carried out by the genera Pseudomonas and Thiobacillus . Nitrate present in the soil is also reduced to nitrogen by the process of denitrification. (d) - (iii). The nitrification process also involves the conversion of nitrite to nitrate. The nitrite is further oxidised to nitrate with the help of the bacterium Nitcobacter .

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