Drainage System — Flashcards
Gujarat Board · Class 9 · Social Science
20 flashcards for Drainage System (Gujarat Board Class 9 Social Science) to test yourself on key terms and facts. Sample: "What is a drainage system?"
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What is a drainage system?
Answer
A drainage system is the systematic pattern of rivers where a main river and its tributaries flow from different directions and merge together. The water eventually empties into a water reservoir, sea…
Define river basin and water divide.
Answer
River Basin: The area drained by a river and its tributaries when flowing through a region. Water Divide: A mountain or upland that separates the flow of water from one drainage system to another.
What are the two main divisions of India's drainage system?
Answer
India's drainage system is divided into: (1) Himalayan Rivers - perennial rivers originating from the Himalayas (2) Peninsular Rivers - seasonal rivers originating from peninsular plateaus and Western…
Why are Himalayan rivers perennial while Peninsular rivers are seasonal?
Answer
Himalayan rivers are perennial because they receive water from both monsoon rains and melting snow/glaciers throughout the year. Peninsular rivers are seasonal as they depend only on monsoon rains and…
What are the three stages of a river system?
Answer
1. Upper Course: Mountainous region with intense erosion and fast flow 2. Middle Course: Slower flow with meanders formation 3. Lower Course: Formation of distributaries and delta near the mouth…
Describe the Dendritic drainage pattern with an example.
Answer
Dendritic Pattern: When the arrangement of a main river and its tributaries resembles the branches of a tree. Example: River Ganga and its tributaries form a dendritic pattern.
What is a Trellis drainage pattern?
Answer
Trellis Pattern: When streams from mountainous regions meet each other due to slopes and form a net-like shape. Example: Many streams from the Himalayan region show this pattern.
Name the major rivers of the Indus (Sindhu) River System.
Answer
Main river: Sindhu (Indus). Major tributaries: Satluj, Beas, Ravi, Chenab, and Jhelum. These five rivers meet near Mithankot in Pakistan before flowing into the Arabian Sea.
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