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Why is Rhizobium categorised as a symbio...

Why is Rhizobium categorised as a symbiotic bacterium?

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Rhizobium lives in the root nodules of leguminous plants and fixes the atmospheric nitrogen by converting them into nitrogenous compounds. These can be utilised by the plants as nutrients. Since, bacteria make the nitrogen available to plants in utilisable form, therefore, it is known as a biofertiliser.
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