Download NCERT Solutions for Class 9 Social Science Chapter 03 Drainage
Access comprehensive textbook solutions for Chapter 03 Drainage using the official curriculum guides for Class 9 Social Science. Designed to align with the 2026-27 NCERT standards, these detailed answers help students reinforce core academic concepts.
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NCERT Solutions for Class 9 Social Science for Chapter 3 Geography Drainage
1. Choose the right answer from the four alternatives given below.
(i) Which one of the following describes the drainage patterns resembling the branches of a tree?
(a) Radial
(b) Dendritic
(c) Centrifugal
(d) Trellis
Answer: (b) Dendritic
(ii) In which of the following states is the Wular lake located?
(a) Rajasthan
(b) Uttar Pradesh
(c) Punjab
(d) Jammu and Kashmir
Answer: (d) Jammu and Kashmir
(iii) The river Narmada has its source at
(a) Satpura
(b) Brahmagiri
(c) Amarkantak
(d) Slopes of the Western Ghats
Answer: (c) Amarkantak
(iv) Which one of the following lakes is a salt-water lake?
(a) Sambhar
(b) Dal
(c) Wular
(d) Gobind Sagar
Answer: (a) Sambhar
(v) Which one of the following is the longest river of the Peninsular India?
(a) Narmada
(b) Krishna
(c) Godavari
(d) Mahanadi
Answer: (c) Godavari
(vi) Which one amongst the following rivers flows through a rift valley?
(a) Mahanadi
(b) Tungabhadra
(c) Krishna
(d) Tapi
Answer: (d) Tapi
2. Answer the following questions briefly.
(i) What is meant by a water divide? Give an example.
Answer: Any elevated area, such as a mountain or an upland, separates two drainage basins. Such an upland is known as a water divide. Western Ghats is best example of water divide.
(ii) Which is the largest river basin in India?
Answer: The Ganga river basin is the largest river basin in India.
(iii) Where do the rivers Indus and Ganga have their origin?
Answer: The Indus river has its origin in Tibet near the Mansarovar Lake while the Ganga River has its origin in Gangotri Glacier in Uttarakhand.
(iv) Name the two headstreams of the Ganga. Where do they meet to form the Ganga?
Answer: Alaknanda and Bhagirathi are the two headstreams of the river Ganga. They both meet to form the Ganga at Devprayag.
(v) Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?
Answer: The Brahmaputra river in Tibet receives very heavy rains, and it carries lot of water and silt. little volume of water in so it carries little silt there. However, once it enters India, Brahmaputra is fed by heavy rains, and it carries lot of water and silt.
(vi) Which two Peninsular Rivers flow through trough?
Answer: The two rivers that flow through troughs are Narmada and Tapi. These are the west flowing rivers, which form estuaries while entering the Arabian Sea.
(vii) State some economic benefits of rivers and lakes.
Answer: Some economic benefits of rivers and lakes are:
a. Lakes and rivers are used to produce hydroelectricity.
b. They are useful for navigation.
c. They are beneficial for fisheries. d. They are useful for irrigation.
e. Many ancient human settlements are established near the lakes and rivers. For example: Bhopal in India is a lake city while Indo-Gangetic Plains are known for their ancient civilisation.
f. They are also tourist destinations.
3. Below are given names of a few lakes of India. Group them under two categories
– natural and created by human beings.
(a) Wular (b) Dal (c) Nainital (d) Bhimtal (e) Gobind Sagar (f) Loktak (g) Barapani (h) Chilika (i) Sambhar (j) Rana Pratap Sagar (k) Nizam Sagar (l) Pulicat (m) Nagarjuna Sagar (n) Hirakund
Answer:
|
Natural Lakes |
Human Lakes |
|
Wular |
Gobind Sagar |
|
Dal |
Rana Pratap Sagar |
|
Nainital |
Nizam Sagar |
|
Bhimtal |
Nagarjuna Sagar |
|
Loktak |
Hirakund |
|
Barapani |
|
|
Chilika |
|
|
Sambhar |
|
|
Pulicat |
|
4. Discuss the significant difference between the Himalayan and the Peninsular Rivers.
Answer:
|
Himalayan Rivers |
Peninsular Rivers |
|
They are snowfed. |
They are rainfed. |
|
They rise from the Himalayas. |
They originate in the Western Ghats. |
|
They are long distant rivers. |
They are short distant rivers. |
|
They are perennial rivers. |
They are seasonal rivers. |
|
They have large basins. |
They have small basins. |
|
For example: Ganga, Yamuna, Indus, Brahamputra, etc. |
For example: Krishna, Kaveri, Godavari, Mahanadi, etc. |
5. Compare the east flowing and the west flowing rivers of the Peninsular plateau.
Answer:
|
The East Flowing Peninsular Rivers |
The West Flowing Peninsular Rivers |
|
They drain into the Bay of Bengal. |
They drain into Arabian Sea |
|
They cover longer distance. |
They cover shorter distance. |
|
They form deltas. |
They form estuaries. |
|
For example: Kaveri, Godavari, etc. |
For example: Narmada and Tapi. |
6. Why are rivers important for the country’s economy?
Answer: The rivers are important in country's economy because of the following reasons:
Most of the ancient the human civilizations originated, flourished and developed in the river valleys.
They carry water containing sediments and minerals, which are very useful for agriculture.
They provide water for various human activities like, domestic, agricultural, and industrial purposes.
Rivers provide cheap and efficient inland transport for trade and commerce.
They are in generating hydroelectricity.
They also provide water to reservoirs, which are used for fishing and recreational activities.
Map Skills
(i) On an outline map of India mark and label the following rivers: Ganga, Satluj, Damodar, Krishna, Narmada, Tapi, Mahanadi, and Brahmaputra.
(ii) On an outline map of India mark and label the following lakes: Chilika, Sambhar, Wular, Pulicat, Kolleru.
Project/Activity
Across
1. Nagarjuna Sagar is a river valley project. Name the river?
2. The longest river of India.
3. The river which originates from a place known as Beas Kund.
4. The river which rises in the Betul district of MP and flows westwards.
5. The river which was known as the “Sorrow” if West Bengal.
6. The river on which the reservoir for Indira Gandhi canal has been built.
7. The river whose source lies near Rohtang Pass.
8. The longest river of Peninsular India.
Down
9. A tributary of Indus originating from Himachal Pradesh.
10. The river flowing through fault, drains into the Arabian Sea.
11. A river of South India, which receives rain water both in summer and winter.
12. A river which flows through Ladakh, Gilgit and Pakistan.
13. A important river of the Indian desert.
14. The river which joins Chenab in Pakistan.
15. A river which rises at Yamunotri glacier.
Answer
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Social Science Class 9 Curriculum Solutions: Chapter 03 Drainage
Chapter Exercise Answers for Class 9 Social Science
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Detailed Answer Guides for Chapter 03 Drainage
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