Given below are two statements, one is labelled asAssertion (A) :and the other as Reason (R).Assertion (A):The Himalayas form source of several large perennial rivers.Reason (R):The higher ranges of Himalayas are sriow covered throughout the year.

1. A

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

   Both true, R not explaining A. Snow on higher ranges is exactly why many Himalayan rivers are perennial.

2. B

   (A) is false, but (R) is true

   (A) false. They are sources of large perennial rivers.

3. C

   (A) is true, but (R) is false

   (R) false. Higher Himalaya does hold snow/ice year-round in large parts.

4. D

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

   Both true and R explains A. Snow and glaciers on the higher ranges feed perennial flow.

Summary. Official key is (d). Himalayan perennial rivers because higher ranges stay snow-covered. Also note: Ganga–Yamuna–Indus — Snow/glacier heads; Barak / some eastern — More rain-fed; Siachen / Gangotri — Ice stores; sriow — Booklet spelling of snow.