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Name a free-living and symbiotic bacteri...

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

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Free living bacterium as biofertilizer = Azotobacter. Symbiotic bacterium as biofertilizer = Rhizobium. These are called biofertilizers because these improve the structure and fertility of soil by fixing atmospheric nitrogen into nitrites and nitrates (ie., Nitrogen fixation).
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