Q6 of 51 Page 1

Name a free-living and a symbiotic bacterium that serve as bio-fertilizer. Why are they so called?

Azospirillium, Azotobacter and Rhizobium are the most commonly used symbiotic bacteria that serve as bio-fertilizers. They are known as bio-fertilizers because they aid in enriching the soil nutrients. They help in fixing atmospheric nitrogen.


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