Answer:
In mountainous areas, the decrease in temperature with increasing altitude leads to the corresponding change in natural vegetation.
(i) The foothills of the Himalayas-Shiwaliks have tropical moist deciduous flora. Sal and bamboo are important trees up to 1000 m in height. (ii) They are followed by the wet hill forests. They lie between about 1000 B to 2000 mts. Important trees are oak chestnut Ash birch etc. (iii) Between 1500 and 3300 m above sea level there occur the well-known coniferous forests. Pine deodar silver fir spruce etc. are some dominant trees. (iv) Above the coniferous forests lie the alpine forests at an altitude of about 3600 m. important trees are silver fir pine Birch etc.
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