Question

Match the columns and choose the correct option.

	I		II
(a)	Free-living aerobic nitrogen fixers	1.	Anabaena and Nostoc
(b)	Anaerobic nitrogen fixers	2.	Pseudomonas and Thiobacillus
(c)	Nitrogen-fixing cyanobacteria	3.	Nitrosomonas and Nitrosococcus
(d)	Denitrifying bacteria	4.	Azotobacter and Beijerinckia
(e)	Nitrifying bacteria	5.	Rhodospirillum

• A. a - 4, b - 5, c - 1, d - 2, e - 3
• B. a - 5, b - 4, c - 1, d - 3, e - 2
• C. a - 4, b - 5, c - 2, d - 3, e - 1
• D. a - 4, b - 3, c - 1, d - 2, e - 5
• E. a - 4, b - 5, c - 3, d - 2, e - 1

Answer 1

The correct option is A a - 4, b - 5, c - 1, d - 2, e - 3

a) Free-living aerobic nitrogen fixers - Azotobacter and Beijernikia

b) Anaerobic nitrogen fixers - Rhodospirillum

c) Nitrogen-fixing cyanobacteria - Anabaena and Nostoc

d) Denitrifying bacteria - Pseudomonas and Thiobacillus

e) Nitrifying bacteria - Nitrosomonas and Nitosococcus

So the correct answer is 'a-4, b-5, c-1, d-2, e-3'