AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(C) A is true, but R is false.
Assertion is correct — contour ploughing decelerates the flow of rainwater down the slope, preventing topsoil loss. The Reason is false as it states the opposite.
The textbook clearly states: "Ploughing along the contour lines can decelerate the flow of water down the slopes." So A is a valid soil conservation method, but R incorrectly claims it accelerates water flow — making R false. Always check whether the Reason contradicts the textbook explanation of the Assertion.