CBSE Class 11 Geography Chapter 3: Drainage System NCERT Solutions

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NCERT Solutions PDF Class 11 PDF

This chapter provides a detailed exploration of India's drainage systems, crucial for understanding the physical geography of the country. The NCERT Solutions for Class 11 Geography, Chapter 3, 'Drainage System,' cover key concepts such as river basins, watersheds, and various drainage patterns like dendritic and trellis. It also delves into the characteristics of major Indian rivers, including their origins, courses, and significance. The solutions offer clear explanations and answers to questions related to these topics, helping students grasp the complexities of river systems. These solutions are designed to aid students in their exam preparation by providing accurate and easy-to-understand information on the drainage geography of India, reinforcing learning through practice questions and explanations.

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BoardCBSE
ClassClass 11
SubjectGeography
Session2026
LanguageEnglish
TypeNCERT Solutions
Chapter3. Drainage System

Chapter summary

Chapter 3 of the NCERT Class 11 Geography syllabus focuses on India's Drainage System. The provided solutions explain fundamental concepts like river basins and watersheds, differentiating between them. They also detail drainage patterns, specifically the dendritic and trellis types, with examples. Key questions about major Indian rivers, including those known for specific characteristics like being the 'Sorrow of Bengal' or flowing through rift valleys, are addressed. This chapter's solutions are essential for understanding the hydrological features of India and their geographical significance.

Learning outcomes

  • Understand the concept of a river basin and watershed.
  • Differentiate between dendritic and trellis drainage patterns.
  • Identify major Indian rivers and their characteristics.
  • Explain the significance of rivers flowing through rift valleys.
  • Recognize rivers associated with specific geographical phenomena like the 'Sorrow of Bengal'.

Topics covered

Paper topics

  • River Basin
  • Watershed
  • Drainage Patterns
  • Dendritic Drainage
  • Trellis Drainage
  • Indian Rivers
  • Ganga River
  • Narmada River
  • Sorrow of Bengal
  • Panchnad
  • Confluence of Rivers
  • Alaknanda and Bhagirathi

Important topics

  • River Basin vs. Watershed
  • Dendritic and Trellis Drainage Patterns
  • Major Indian Rivers and their unique features
  • Confluence points of major rivers

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Questions and Solutions

Question 1

Choose the right answer from the four alternatives given below.

Which one of the following rivers was known as the 'Sorrow of Bengal'?

  1. The Gandak
  2. The Son
  3. The Kosi
  4. The Damodar
Solution: The correct answer is (d) The Damodar. The Damodar River is historically referred to as the 'Sorrow of Bengal' due to its frequent and devastating floods that caused significant damage and disruption in the region.

Question 2

Choose the right answer from the four alternatives given below.

Which one of the following rivers has the largest river basin in India?

  1. The Indus
  2. The Brahmaputra
  3. The Ganga
  4. The Krishna
Solution: The correct answer is (c) The Ganga. The Ganga River system commands the largest river basin in India, covering a vast geographical area and supporting a significant population.

Question 3

Choose the right answer from the four alternatives given below.

Which one of the following rivers is not included in 'Panchnad'?

  1. The Ravi
  2. The Chenab
  3. The Indus
  4. The Jhelum
Solution: The correct answer is (c) The Indus. The term 'Panchnad' specifically refers to the confluence of the five major tributaries of the Indus River: the Jhelum, the Chenab, the Ravi, the Beas, and the Sutlej. The Indus River itself is the main river into which these tributaries flow.

Question 4

Choose the right answer from the four alternatives given below.

Which one of the following rivers flows in a rift valley?

  1. The Son
  2. The Narmada
  3. The Yamuna
  4. The Luni
Solution: The correct answer is (b) The Narmada. The Narmada River is a prominent example of a river that flows through a rift valley, a geological feature formed by tectonic forces where the land between two parallel faults subsides.

Question 5

Choose the right answer from the four alternatives given below.

Which one of the following is the place of confluence of the Alaknanda and the Bhagirathi?

  1. Vishnu Prayag
  2. Rudra Prayag
  3. Karan Prayag
  4. Deva Prayag
Solution: The correct answer is (d) Deva Prayag. Deva Prayag is the sacred location in Uttarakhand where the Alaknanda and Bhagirathi rivers merge. After their confluence, the combined river is known as the Ganga River.

Question 6

State the differences between the following:

(i) River Basin and Watershed

Solution:

The primary difference between a river basin and a watershed lies in their scale and the rivers they encompass:

  • River Basin: This term typically refers to the catchment area of a large river and its tributaries. It includes all the land from which water drains into that major river system. River basins are generally extensive in area.
  • Watershed: A watershed is a smaller unit, often referring to the catchment area of a smaller stream, rivulet, or rill. It is a land area that channels rainfall and snowmelt to creeks, rivers, and lakes. Watersheds are smaller in area compared to river basins.

In essence, a watershed can be considered a sub-unit within a larger river basin.

Question 7

State the differences between the following:

(ii) Dendritic and Trellis drainage pattern

Solution:

The differences between dendritic and trellis drainage patterns are based on their formation and appearance:

  • Dendritic Drainage Pattern: This pattern develops in areas where the river channel follows the slope of the terrain, with tributaries joining the main river at various angles, resembling the branches of a tree. It typically forms in areas with uniform rock structure and gentle slopes. The drainage pattern observed in the Great Plains of North India is a classic example of a dendritic pattern.
  • Trellis Drainage Pattern: This pattern is formed when a river and its tributaries are influenced by structural controls, such as folded mountains, where the tributaries flow parallel to each other and join the main river at roughly right angles. This creates a net-like or lattice structure. Examples of trellis drainage patterns can be found in the old folded mountains of regions like Singhbhum and in the upper reaches of the Himalayan rivers.

Common mistakes

  • Confusing river basins with watersheds.
  • Misidentifying drainage patterns.
  • Incorrectly recalling specific river characteristics or associations.

Revision tips

  • Draw diagrams to illustrate dendritic and trellis drainage patterns.
  • Create a table listing major Indian rivers and their key features.
  • Focus on understanding the geographical reasons behind river characteristics (e.g., rift valley flow).
  • Practice identifying rivers based on their descriptions or associated phenomena.

Practice MCQs

Q1. Which river is historically known as the 'Sorrow of Bengal' due to its devastating floods?

Q2. Which river system in India possesses the largest river basin?

Q3. The term 'Panchnad' refers to the confluence of five major rivers in the Indus basin. Which of the following rivers is NOT part of the Panchnad?

Q4. Which of the following rivers is notable for flowing through a rift valley?

Q5. The confluence point of the Alaknanda and Bhagirathi rivers, marking the origin of the Ganga River, is known as:

Frequently asked questions

What is the main difference between a river basin and a watershed?

A river basin refers to the catchment area of a large river, while a watershed is the catchment area for smaller streams and rills. River basins are generally larger in area than watersheds.

Can you explain the dendritic drainage pattern?

A dendritic drainage pattern resembles the branches of a tree, where tributaries join the main river at various angles, forming a network. The plains of North India exhibit this pattern.

Which river is known as the 'Sorrow of Bengal' and why?

The Damodar River is called the 'Sorrow of Bengal' because its frequent and severe floods caused immense destruction and hardship in the region.

What is 'Panchnad' in the context of Indian rivers?

'Panchnad' refers to the confluence of five major tributaries of the Indus River: the Jhelum, the Chenab, the Ravi, the Beas, and the Sutlej. The Indus River itself is not part of the Panchnad.

Where do the Alaknanda and Bhagirathi rivers meet?

The Alaknanda and Bhagirathi rivers meet at a place called Deva Prayag. From this confluence, the combined river is known as the Ganga.

Which Indian river flows through a rift valley?

The Narmada River is a significant example of a river that flows through a rift valley, a geological depression formed by tectonic activity.

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