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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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A free living bacterium is Azotobacter and symbiotic bacterium is Rhizobuim. They are called biofertilisers because these organisms increase the nutrient quantity of soil.
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XII BOARD PREVIOUS YEAR PAPER ENGLISH-XII BOARDS-SECTION-B
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