Question

Match the columns and choose the correct answers

	I		II
a	Free living aerobic nitrogen fixers	1	Anabaena and Nostoc
b	Anaerobic nitrogen fixers	2	Pseudomonas denitrificans and Thiobacillus denitrificans
c	Nitrogen fixing cyanobacteria	3	Nitrosomonas and Nitrococcus
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 - 1, b - 2, c - 3, d - 4, e - 5
• D. a - 2, b - 3, c - 4, d - 1, e - 5

Answer 1

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

Rhodospirillum is a free-living nitrogen-fixing anaerobic bacteria.
Anabaena & Nostoc are symbiotic nitrogen-fixing cyanobacteria.
Azotobacter and Beijerinikia are free-living nitrogen-fixing aerobic bacteria.
Pseudomonas denitrificans and Thiobacillus denitrificans are denitrifying bacteria.
Nitrosomonas and Nitrosococcus are nitrifying bacteria.