Explanation:

• The southern slopes of the Himalayas carry a thicker vegetation cover because of relatively higher precipitation than the drier north-facing slopes.
• The growth of vegetation depends upon the amount of sunlight and rainfall received.
• The southern slopes of the Himalayas receive more rain due to the south west monsoon winds which produce an orographic rainfall along the southern slopes.
• The northern slopes do not receive any such rainfall being on the leeward side. So, the southern slopes are covered with thick vegetation as compared to the northern slopes.
• he southern slopes in Himalayan region are covered with thick vegetation as compared to northern slopes of the same hills on account of more exposure to sunlight, more precipitation, and less exposure to colder wind