NCERT Solutions for Class 9 Social Science History Chapter 4
Social Science Class 9 History
Climate 4
Important NCERT Questions Based on new NCERT Books for Session 2022-2023
Questions No: 3
Why does the rainfall decrease from the east to the west in Northern India?
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The Bay of Bengal branch of the monsoon winds moves towards northeast and return westwards covering the northern plains. While they move towards west, their moisture contains tends to reduce with subsequent rains. Hence the rainfall decreases from east to west in northern India.
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The decrease in rainfall from east to west in Northern India is due to several reasons. The Himalayas obstruct moisture-laden winds from the Bay of Bengal, causing heavy rainfall on the eastern slopes but blocking moisture on the western side, creating a rain shadow effect. Additionally, regions in the east are closer to the Bay of Bengal and Indian Ocean, receiving more moisture-laden winds. Conversely, areas in the west, farther from these water bodies, experience reduced rainfall, contributing to the east-west rainfall gradient in Northern India.