Given below are two statements, one is labelled asAssertion (A) :and the other as Reason (R).Assertion (A):In the Himalayan mountains different types of vegetation are found.Reason (R):In Himalayas, there are variations in climate with change in altitude.

1. A

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

   Both true, R not explaining A. Altitude-climate change is why Himalayan vegetation belts stack.

2. B

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

   (A) false. The Himalaya do show many vegetation types.

3. C

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

   (R) false. Climate does change with height.

4. D

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

   Both true and R explains A. Tropical to alpine belts follow the temperature-rainfall change with altitude.

Summary. Official key is (d). Different Himalayan vegetation because climate changes with altitude. Also note: Tropical → alpine — Shiwalik sal up to alpine meadow; North vs south face — Rain-shadow on the Tibetan side; Tree line — Falls as you go west and higher; Western Ghats — Latitude/rainfall, not this altitude stack.