Q1
Why are Himalayan rivers called perennial?
AThey flow year-round, fed by snowmelt and rain
BThey dry up completely each year
CThey only flow during monsoons
DThey never flow at all
CBSEClass 9 (CBSE)Social ScienceCh 8 · Topic 1
The Himalayan River Systems
The Himalayan river systems, including the Indus, Ganga, and Brahmaputra, are fed by both melting snow and monsoon rains, making them perenn
Core concept
These rivers originate from glaciers high in the Himalayas, meaning they receive water from melting snow even during the dry season, ensuring a steady year-round flow.
How it works
The Ganga river system includes major tributaries like the Yamuna, Gomti, and Ghaghara, together forming one of the most fertile and densely populated river basins in the world.
Why it matters
The Brahmaputra, originating in Tibet, flows through a difficult, mountainous terrain before entering India, known for significant flooding during the monsoon season.
Key detail
These river systems support massive populations through agriculture, drinking water, transportation, and hydroelectric power generation, making them vital to India's economy and daily life.
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Quick notes
• Himalayan rivers are perennial, fed by snowmelt and monsoons.
• They originate from glaciers high in the Himalayas.
• The Ganga has tributaries like the Yamuna, Gomti and Ghaghara.
• The Ganga basin is densely populated and fertile.
• The Brahmaputra originates in Tibet.
• The Brahmaputra often floods during the monsoon.
• These rivers support agriculture and drinking water.
• They also support hydroelectric power generation.