AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(A) Both A and R are true, and R is the correct explanation of A.
The textbook states: "Today, in western Rajasthan, the practice of rooftop rainwater harvesting is on the decline as plenty of water is available due to the perennial Indira Gandhi Canal." Thus both statements are true and R correctly explains A.
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The exact textbook line directly links the decline in rooftop rainwater harvesting (Assertion) to the availability of water through the Indira Gandhi Canal (Reason), making R the correct explanation of A. Students should remember this specific example as it is frequently tested. Option (A) is the only correct choice.