Assertion (A): With a rich soil cover combined with an adequate water supply and favourable climate it is agriculturally a productive part of India.

Reason (R): The Northern Plain being 2400 km long and 240 to 320 km broad, is a densely populated physiographic division.

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

Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).

Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true.

answer is C.

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Detailed Solution

Alluvial soil dominates the Northern Plain. The Northern plain developed over millions of years by the deposition of alluvium in a huge basin in the foothills of the Himalayas. It is an agriculturally productive portion of India due to its thick soil cover, ample water supply, and a favourable temperature. So, Assertion (A) is true.
The northern plain was created by the convergence of three major river systems, notably the Indus, Ganga, and the Brahmaputra, and their tributaries. The Northern plains, which are approximately 2400 km long and 240 to 320 km wide, are a highly inhabited physiographic division. Reason (R) is true, and Reason (R) is not the correct explanation of Assertion (A).

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