Assertion [A]: Root nodules provide shelter to certain bacteria.
Reason [R]: Bacteria present in root nodules helps in fixing nitrogen for the plant.

A is true and R is false.

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A is false and R is true.

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Both A and R are true and R is the correct explanation for A.

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Both A and R are true but R is not the correct explanation for A

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Solution

The correct option is C Both A and R are true and R is the correct explanation for A.
Root nodules are mostly present in the leguminous plants. E.g. Pulses, beans, soybeans, etc. These nodules provide shelter to certain bacteria. These bacteria can fix the atmospheric nitrogen for the plant since they cannot use it directly. This type of association where both plant and bacteria are mutually benefitted is called symbiosis.

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