Assertion: The northern plains are generally described as rocky lands with no variations in their relief.

Reason: These vast plains also have diverse relief features.

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Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true and but (R) is the correct explanation of (A).

(A) is correct but (R) is wrong.

(A) is wrong but (R) is correct.

answer is D.

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Detailed Solution

The three major river systems in India, the Indus, the Ganga, and the Brahmaputra, along with their tributaries, have formed the Northern Plains. These rivers have fertile deposits that form alluvial soil in the northern plains. This plan is spread over a vast area of seven lakh sq. km. It is densely populated due to the plain area used for cultivation and farming. It is 240 to 320km broad and has an adequate water supply and favourable climate, making it a highly productive part of India. The riverine islands are also part of this plain due to the low velocity in the lower course of rivers. These plains are described as flatland with no variations in their reliefs. Hence, the assertion is wrong, but the reason is correct.

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