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NCERT Solutions for Class 11 Geography India Physical Environment Chapter 3 Drainage System 2026-27

NCERT Solutions for Class 11 Geography Chapter 3 Drainage System FREE PDF Download

NCERT Solutions for Class 11 Geography Chapter 3 Drainage System help students understand how rivers and drainage networks shape India’s physical environment. This chapter explains important concepts such as drainage patterns, Himalayan rivers, Peninsular rivers, river basins, and the role of rivers in agriculture, settlement, and landform development.

Vedantu’s Class 11 Geography Chapter 3 NCERT Solutions provide clear, question-wise answers making it easier for students to revise textbook concepts, and prepare better for CBSE exams.

Students can download the NCERT Solutions for Class 11 Geography FREE PDF and use it anytime for answer writing practice, and better understanding of the chapters.

NCERT Solutions Class 11 Geography Chapter 3 FREE PDF

1. Choose the right answer from the four alternatives given below.

(i) Which one of the following rivers was known as the ‘Sorrow of Bengal’?

(a) The Gandak

(b) The Son

(d) The Damodar

Answer: (d) The Damodar

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

(a) The Indus

(b) The Brahmaputra

(d) The Krishna

Answer: (c) The Ganga

(iii) Which one of the following rivers is not included in ‘Panchnad’?

(a) The Ravi

(b) The Chenab

(d) The Jhelum

Answer: (c) The Indus

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

(a) The Son

(b) The Narmada

(d) The Luni

Answer: (b) The Narmada

(v) Which one of the following is the place of confluence of the Alaknanda and the

Bhagirathi?

(a) Vishnu Prayag

(b) Rudra Prayag

(d) Deva Prayag

Answer: (d) Deva Prayag

2. State the differences between the following.

(i) River Basin and Watershed

Answer:

Basis	River Basin	Watershed
Meaning	The area drained by a large river and its tributaries is called a river basin.	The area drained by small streams, rivulets, or rills is called a watershed.
Size	River basins cover a larger area.	Watersheds cover a smaller area.
Example	The Ganga Basin is an example of a river basin.	Small drainage areas within a river basin are examples of watersheds.

(ii) Dendritic and Trellis drainage pattern

Basis	Dendritic Drainage Pattern	Trellis Drainage Pattern
Meaning	A drainage pattern that looks like the branches of a tree is called dendritic drainage.	A drainage pattern in which main rivers flow parallel and smaller tributaries join them at right angles is called trellis drainage.
Formation	It develops in areas where the land has a uniform slope and similar rock structure.	It develops in areas with folded mountains or hard and soft rocks arranged parallel to each other.
Example	The drainage pattern of the Northern Plains is an example of dendritic drainage.	It is commonly found in the Himalayan region and Eastern ranges like Purvanchal.

(iii) Radial and Centripetal drainage pattern

Basis	Radial Drainage Pattern	Centripetal Drainage Pattern
Meaning	When rivers originate from a central highland and flow in different directions, it is called a radial drainage pattern.	When rivers flow from different directions into a lake or depression, it is called a centripetal drainage pattern.
Direction of Flow	Rivers flow outward from a hill or plateau.	Rivers flow inward towards a central low-lying area.
Example	Rivers originating from the Amarkantak range show radial drainage.	Rivers flowing into Sambhar Lake in Rajasthan show centripetal drainage.

(iv) Delta and Estuary

Basis	Delta	Estuary
Meaning	A delta is a triangular depositional landform formed at the mouth of a river.	An estuary is a wide, funnel-shaped mouth of a river where freshwater mixes with seawater.
Formation	It is formed when rivers deposit large amounts of alluvium near the sea.	It is formed where strong tides and currents remove sediments, preventing deposition.
Coast Type	Deltas usually form along low-tide coastal areas.	Estuaries form in areas with strong tidal action.
Use	Deltas are fertile and suitable for agriculture.	Estuaries are useful for fishing and inland navigation.
Examples	Rivers like the Krishna, Kaveri, Mahanadi, and Godavari form deltas.	Rivers like the Narmada and Tapi form estuaries.

3. Answer the following questions in about 30 words.

(i) What are the socio-economic advantages of interlinking of rivers in India?

Answer: Interlinking of rivers can help India manage the unequal distribution of water. Some regions face floods during the rainy season, while others suffer from drought and water shortage. By connecting rivers through canals, excess water from flood-prone areas can be transferred to dry regions. This can reduce flood damage, improve irrigation, and provide drinking water in water-scarce areas. It can also increase agricultural productivity, support farmers, and reduce economic losses caused by floods and droughts. In the long run, river inter-linking may help in better water management, rural development, and overall economic growth.

(ii) Write three characteristics of the Peninsular river.

Answer: Peninsular rivers originate from the Peninsular Plateau and the Central Highlands. Most of these rivers are seasonal because they depend mainly on monsoon rainfall. They are generally shorter than Himalayan rivers and have fixed courses with well-developed valleys. Their catchment areas are also smaller. These rivers are older in age and have almost reached their base level. They show drainage patterns such as trellis, radial, and rectangular due to the structure and slope of the land. Examples include the Godavari, Krishna, Kaveri, Narmada, and Tapi

4. Answer the following questions in not more than 125 words.

(i) What are the important characteristic features of North Indian rivers? How are these different from Peninsular rivers?

Answer: North Indian rivers mainly originate from the Himalayan glaciers. They are perennial because they receive water from both glaciers and rainfall. These rivers have long courses, large drainage basins, deep valleys in the mountains, and meandering courses in the plains. They are young and active rivers.

Peninsular rivers originate from the Peninsular Plateau and the Central Highlands. Most of them are seasonal as they depend mainly on monsoon rainfall. They are shorter, have smaller basins, fixed courses, and well-adjusted valleys. Unlike the young Himalayan rivers, Peninsular rivers are older and have almost reached their base level.

(ii) Suppose you are travelling from Haridwar to Siliguri along the foothills of the Himalayas. Name the important rivers you will come across. Describe the characteristics of any one of them.

Answer: While travelling from Haridwar to Siliguri along the Himalayan foothills, we come across important rivers such as the Ganga, Ramganga, Sharda, Saryu, Gandak, Bagmati, Kosi, and other tributaries.

The Ganga is one of the most important rivers of India. It originates from the Gangotri glacier near Gaumukh in Uttarakhand as the Bhagirathi. At Devprayag, it joins the Alaknanda and is called the Ganga. It enters the plains at Haridwar and flows through Uttar Pradesh, Bihar, and West Bengal before reaching the Bay of Bengal. The Ganga basin is one of the largest and most fertile river basins in India.

Prepare Better with Vedantu’s Class 11 Geography Chapter 3 NCERT Solutions

Vedantu’s NCERT Solutions for Class 11 Geography India Physical Environment Chapter 3 Drainage System help students revise river systems, drainage patterns, basins, deltas, estuaries, and Peninsular rivers in a simple way. Students can use the FREE PDF to practise clear, accurate, and well-structured answers.

Class 11 Geography Chapter 3, Drainage System, is important for understanding India’s rivers and their roles in landforms, agriculture, and settlements. Vedantu’s solutions explain each NCERT question in easy language so students can learn faster and write better answers in exams.

Related Study Materials for Class 11 Geography Chapter 3 Drainage System

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2	Class 11 Geography Chapter 3 Revision Notes

Explore More NCERT Solutions for Class 11 Geography Chapters

S.No	NCERT Class 11 India Physical Environment Solutions
1	Chapter 1 India: Location Solutions
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3	Chapter 4 Climate Solutions
4	Chapter 5 Natural Vegetation Solutions
5	Chapter 6 Natural Hazards and Disasters Solutions

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5	Class 11 Geography NCERT Books

FAQs on NCERT Solutions for Class 11 Geography India Physical Environment Chapter 3 Drainage System 2026-27

1. What is Class 11 Geography Chapter 3 Drainage System about?

Class 11 Geography Chapter 3 Drainage System explains India’s river systems, drainage patterns, river basins, watersheds, deltas, estuaries, and the differences between Himalayan and Peninsular rivers.

2. Which river is known as the Sorrow of Bengal from Class 11 Geography Chapter 3?

The Damodar River is known as the Sorrow of Bengal because it caused frequent floods in the past.

3. Which river has the largest river basin in India?

The Ganga has the largest river basin in India.

4. What is the difference between a river basin and a watershed from NCERT Solutions Class 11 Geography?

A river basin is the area drained by a large river and its tributaries. A watershed is a smaller drainage area drained by small streams or rivulets.

5. What are the main drainage patterns in India?

The main drainage patterns in India include dendritic, trellis, radial, centripetal, rectangular, and parallel drainage patterns.

6. Why are Peninsular rivers mostly seasonal?

Peninsular rivers are mostly seasonal because they depend mainly on monsoon rainfall and do not receive regular glacier-fed water like Himalayan rivers.

7. What is the difference between a delta and an estuary?

A delta is formed by river deposits at the river mouth. An estuary is a funnel-shaped river mouth where freshwater mixes with seawater due to strong tides.

8. Where can I download NCERT Solutions for Class 11 Geography Chapter 3 Drainage System PDF?

Students can download the FREE PDF of NCERT Solutions for Class 11 Geography Chapter 3 Drainage System from Vedantu for exam preparation.