Home Biology Microbes in Human Welfare Statement Based Questions I. All cyanobacteria are N 2 -fixers II. The…
Biology Microbes in Human Welfare Statement Based Questions Single Correct MCQ
Published on: August 13, 2026

I. All cyanobacteria are N 2 -fixers

II. The main sources of biofertilizers are bacteria, fungi and cyanobacteria'

III. Azospirilium and Azotobacter are symbiotic N 2 -fixers.

IV. Microbes like bacteria and many fungi can be grown on nutritive media to form colonies but they cannot be

seen with the naked eyes.

A
All are correct
B
All are wrong
C
Only I, III and IV are wrong
D
Only II is wrong

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