Name a free-living and a symbiotic bacterium that serve as bio-fertiliser. Why are they so called? [2]

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Solution

Free living Bacteria — Azotobacter clostridium [0.5]
Symbiotic Bacteria — Rhizobium [0.5]

They are called biofertilisers because these are the micro-organisms that enrich the nutrient quality of the soil. They help in fixing atmospheric nitrogen. [1]

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