Question

Match the following columns -

Column I		Column II
A	Nitrobacter	1	Free - living aerobic nitrogen fixer
B	Clostridium	2	Converts ammonia into nitrite
C	Nitrosococcus	3	Changes nitrite to nitrate
D	Azotobacter	4	Free - living anaerobic nitrogen fixer

• A. (A)-(2), (B)-(4), (C)-(3), (D)-(1)
• B. (A)-(3), (B)-(4), (C)-(2), (D)-(1)
• C. (A)-(4), (B)-(2), (C)-(1), (D)-(3)
• D. (A)-(1), (B)-(2), (C)-(3), (D)-(4)

Answer 1

Answer: (B)

Correct answer is (b) (A)-(3), (B)-(4), (C)-(2), (D)-(1)