Rhizobium bacteria in the root nodules of leguminous plants help in fixing:

Hydrogen

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Nitrogen

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Oxygen

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Sulphur

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Solution

The correct option is B
Nitrogen

Rhizobium bacteria in the root nodules of leguminous plants help in fixing nitrogen. Nitrogen has to be 'fixed' because plants cannot take up nitrogen directly from the atmosphere.

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how does rhizobium bacteria know that they are residing in the root nodules of leguminous plants

Rhizobium produces nodules in leguminous plants.

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