Question
Why is Rhizobium categorised as a ‘symbiotic bacterium’? How does it act as a biofertiliser?
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Answer
Rhizobium is present in the root nodules of leguminous plants. Theirs is a symbiotic relationship in which the bacterium obtains food and shelter from the plant and the plant gets fixed nitrogen in return. These bacteria fix atmospheric nitrogen into organic forms, which is used by the plant as nutrient.
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