Published by:
CGP EDU Academic Team
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.
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