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Q7
(IAS/1995)
Geography › Indian Physical Geography › Natural vegetation zones
Answer Verified
The Alpine vegetation in the western Himalayas is found only up to a height of 3000 metres, while in the eastern Himalayas it is found up to a height of 4000 metres,. The reason for this variation in the same mountain range is that
Result
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Correct:
C
Explanation
The variation in the altitude of alpine vegetation between the Eastern and Western Himalayas is primarily due to the difference in monsoon rainfall.
- Eastern Himalayas: This region receives heavy precipitation (over 200 cm annually) from the Bay of Bengal branch of the South-West monsoon. The abundant moisture and high humidity support robust plant growth, allowing alpine vegetation to extend up to 4000 metres.
- Western Himalayas: This region is much drier, receiving significantly less monsoon rainfall (less than 100 cm annually). The relative aridity restricts the upward limit of vegetation, confining alpine flora to a maximum height of around 3000 metres.
Therefore, the higher rainfall in the east directly provides the necessary moisture for vegetation to thrive at much higher elevations.
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