DRAINAGE SYSTEM | Class 11 Geography Notes
By ConceptScroll Team · Published on 17 July 2026 · 3 min read
DRAINAGE SYSTEM – this guide gives you a concise, exam-ready overview of DRAINAGE SYSTEM from Class 11 Geography, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
Introduction
Drainage system refers to the network of rivers, streams, and other water bodies that drain an area of its surface water. It is a fundamental component of the physical geography of a region as it shapes the landscape through erosion and deposition processes. Drainage systems collect and channelize surface water from precipitation, melting snow, or springs, directing it towards larger water bodies such as seas or oceans. The nature and pattern of drainage systems are influenced by factors such as topography, geology, climate, and vegetation. Understanding drainage is crucial for managing water resources, agriculture, flood control, and urban planning. In India, the drainage system plays a vital role in supporting the diverse ecosystems and human settlements across the country.
🔗 Connection: This introduction sets the foundation for understanding the classification of India's drainage system into Himalayan and Peninsular rivers.
Frequently asked questions
1. Multiple choice questions. (i) Which one of the following earthquake waves is more destructive? (a) P-waves (c) Surface waves (b) S-waves (d) None of the above (ii) Which one of the following is a direct source of information about the interior of the earth? (a) Earthquake waves (c) Gravitational force (b) Volcanoes (d) Earth magnetism (iii) Which type of volcanic eruptions have caused Deccan Trap formations? (a) Shield (c) Composite (b) Flood (d) Caldera (iv) Which one of the following describes the lithosphere: (a) upper and lower mantle (c) crust and core (b) crust and upper mantle (d) mantle and core
1.(i) (c) Surface waves are more destructive because they travel along the Earth's surface causing the most damage during earthquakes.
(ii) (a) Earthquake waves are a direct source of information about the Earth's interior as their propagation reveals internal structure.
(iii) (b) Flood volcanic eruptions have caused the Deccan Trap formations, characterized by extensive lava flows.
(iv) (b) Lithosphere comprises the crust and upper mantle, forming the rigid outer layer of the Earth.
2. Answer the following questions in about 30 words. (i) What are body waves? (ii) Name the direct sources of information about the interior of the earth. (iii) Why do earthquake waves develop shadow zone? (iv) Briefly explain the indirect sources of information of the interior of the earth other than those of seismic activity.
(i) Body waves are seismic waves that travel through the Earth's interior. They include P-waves (primary) and S-waves (secondary).
(ii) Direct sources of information about the Earth's interior include earthquake (seismic) waves.
(iii) Earthquake waves develop shadow zones because S-waves cannot travel through the liquid outer core and P-waves are refracted, creating areas where no waves are detected.
(iv) Indirect sources include studies of meteorites, Earth's magnetic field, gravitational st
3. Answer the following questions in about 150 words. (i) What are the effects of propagation of earthquake waves on the rock mass through which they travel? (ii) What do you understand by intrusive forms? Briefly describe various intrusive forms.
(i) The propagation of earthquake waves causes vibrations in the rock mass through which they travel. These vibrations can lead to fracturing, displacement, and deformation of rocks. The intensity of damage depends on the wave type, rock properties, and distance from the epicenter. Surface waves cause the most destruction near the surface, while body waves affect deeper layers.
(ii) Intrusive forms are igneous rock bodies formed when magma cools and solidifies beneath the Earth's surface. Vario
Which of the following is the main source of magma that finds its way to the surface during volcanic eruptions?
Asthenosphere
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