Alpine vegetation in the western Himalayas is found only up to a height of 3000 metre while in the e...........

Indian Geography (Easy) Physiography of India

Alpine vegetation in the western Himalayas is found only up to a height of 3000 metre while in the eastern Himalayas it is found up to a height of 4000 metre. The reason for this variation in the same mountain range is that :

eastern Himalayas are higher than western Himalayas

eastern Himalayas are nearer to the equator and sea coast than western Himalayas

eastern Himalayas get more monsoon rainfall than the western Himalayas

eastern Himalayan rocks are more fertile than the western Himalayan rocks.

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Explanation:

eastern Himalayas get more monsoon rainfall than the western Himalayas

Eastern Himalayas:-
This part of the Himalayas lies between the Tista river in the west and the Brahmaputra river in the east and stretches for a distance of about 720 km.
Also known as the Assam Himalayas, the Eastern Himalayas occupy mainly the areas of Arunachal Pradesh and Bhutan.
The Assam Himalayas show a marked dominance of fluvial erosion due to heavy rainfall.