NCERT Solutions for Class 9 Social Science (Geography) Chapter 3 Drainage
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Page 1
NCERT
SOLUTIONS
CLASS - 9th
aglase .co
SOLUTIONS
CLASS - 9th
aglase .co
Page 2
Book - Contemporary India-I Ncert Solutions | Chapter-3 Geography
Class : 9th
Subject : Geography
Chapter : 3
Chapter Name : Drainage
Q1 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
(ii) In which of the following states is the Wular lake located?
(a) Rajasthan
(b) Uttar Pradesh
(c) Punjab
(d) Jammu and Kashmir
(iii) The river Narmada has its source at
(a) Satpura
(b) Brahmagiri
(c) Amarkantak
(d) Slopes of the Western Ghats
(iv) Which one of the following lakes is a salt water lake?
(a) Sambhar
(b) Dal
(c) Wular
(d) Gobind Sagar
(v) Which one of the following is the longest river of the Peninsular India?
(a) Narmada
(b) Krishna
(c) Godavari
(d) Mahanadi
(vi) Which one amongst the following rivers �ows through a rift valley?
(a) Mahanadi
(b) Tungabhadra
Page 1 of 5 Aglasem Schools
Class : 9th
Subject : Geography
Chapter : 3
Chapter Name : Drainage
Q1 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
(ii) In which of the following states is the Wular lake located?
(a) Rajasthan
(b) Uttar Pradesh
(c) Punjab
(d) Jammu and Kashmir
(iii) The river Narmada has its source at
(a) Satpura
(b) Brahmagiri
(c) Amarkantak
(d) Slopes of the Western Ghats
(iv) Which one of the following lakes is a salt water lake?
(a) Sambhar
(b) Dal
(c) Wular
(d) Gobind Sagar
(v) Which one of the following is the longest river of the Peninsular India?
(a) Narmada
(b) Krishna
(c) Godavari
(d) Mahanadi
(vi) Which one amongst the following rivers �ows through a rift valley?
(a) Mahanadi
(b) Tungabhadra
Page 1 of 5 Aglasem Schools
Page 3
Book - Contemporary India-I Ncert Solutions | Chapter-3 Geography
(c) Krishna
(d) Tapi
Answer. (i) (b) Dendritic
(ii) (d) Jammu and Kashmir
(iii) (c) Amarkantak
(iv) (a) Sambhar
(v) (c) Godavari
(vi) (d) Tapi
Page : 23 , Block Name : Exercise
Q2 Answer the following questions brie�y.
(i) What is meant by a water divide? Give an example.
(ii) Which is the largest river basin in India?
(iii) Where do the rivers Indus and Ganga have their origin?
(iv) Name the two headstreams of the Ganga. Where do they meet to form the Ganga?
(v) Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?
(vi) Which two Peninsular rivers �ow through trough?
(vii) State some economic bene�ts of rivers and lakes.
Answer. (i) Any elevated area such as a mountain or an upland that separate two drainage
basins is called a water divide. An example are the Western Ghats.
(ii) The Ganga Basin is the largest river basin in India.
(iii) The river Indus rises in Tibet. near lake Mansarovar. and the Ganga originates at the
Gangotri Glacier. Both of them have their origin in the Himalayas.
(iv) The two head streams of the Ganga are the Bhagirathi and Alaknanda. They meet at
Devprayag in Uttarakhand to form the Ganga.
(v) In TIbet. the river Indus known as Tsang Po carries a smaller volume of water and less
silt as it is a cold and dry area.
In India. the river carries a large volume of water and considerable amount of silt because it
passes through a region of high rainfall.
(vi) Narmada and Tapi are two peninsular rivers, which �ow through a trough.
(vii) Lakes
Lakes are of a great value to human beings.
Lakes help to regulate the �ow of rivers.
Lakes help to prevent �ooding during rainy season.
During the dry season, lakes help to maintain an even �ow of water.
Lakes can also be used for developing hydel power.
They moderate the climate of the surroundings and maintain the aquatic ecosystem.
They enhance natural beauty and help to develop tourism and provide recreation.
e.g., Dal Lake and Naini Lake at Nainital.
Page 2 of 5 Aglasem Schools
(c) Krishna
(d) Tapi
Answer. (i) (b) Dendritic
(ii) (d) Jammu and Kashmir
(iii) (c) Amarkantak
(iv) (a) Sambhar
(v) (c) Godavari
(vi) (d) Tapi
Page : 23 , Block Name : Exercise
Q2 Answer the following questions brie�y.
(i) What is meant by a water divide? Give an example.
(ii) Which is the largest river basin in India?
(iii) Where do the rivers Indus and Ganga have their origin?
(iv) Name the two headstreams of the Ganga. Where do they meet to form the Ganga?
(v) Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?
(vi) Which two Peninsular rivers �ow through trough?
(vii) State some economic bene�ts of rivers and lakes.
Answer. (i) Any elevated area such as a mountain or an upland that separate two drainage
basins is called a water divide. An example are the Western Ghats.
(ii) The Ganga Basin is the largest river basin in India.
(iii) The river Indus rises in Tibet. near lake Mansarovar. and the Ganga originates at the
Gangotri Glacier. Both of them have their origin in the Himalayas.
(iv) The two head streams of the Ganga are the Bhagirathi and Alaknanda. They meet at
Devprayag in Uttarakhand to form the Ganga.
(v) In TIbet. the river Indus known as Tsang Po carries a smaller volume of water and less
silt as it is a cold and dry area.
In India. the river carries a large volume of water and considerable amount of silt because it
passes through a region of high rainfall.
(vi) Narmada and Tapi are two peninsular rivers, which �ow through a trough.
(vii) Lakes
Lakes are of a great value to human beings.
Lakes help to regulate the �ow of rivers.
Lakes help to prevent �ooding during rainy season.
During the dry season, lakes help to maintain an even �ow of water.
Lakes can also be used for developing hydel power.
They moderate the climate of the surroundings and maintain the aquatic ecosystem.
They enhance natural beauty and help to develop tourism and provide recreation.
e.g., Dal Lake and Naini Lake at Nainital.
Page 2 of 5 Aglasem Schools
Page 4
Book - Contemporary India-I Ncert Solutions | Chapter-3 Geography
Lakes provide opportunities for �shery development.
Rivers
They help to develop hydel power.
They provide water for irrigation, for drinking and other requirements.
They help to develop �sheries.
Q3 Below are given names of a few lakes of India. Group them under two categories –
natural and created by human beings
Answer.
Q4 Discuss the signi�cant difference between the Himalayan and the Peninsular rivers.
Answer. Difference between the Himalayas and Peninsular rivers are as follows
Page 3 of 5 Aglasem Schools
Lakes provide opportunities for �shery development.
Rivers
They help to develop hydel power.
They provide water for irrigation, for drinking and other requirements.
They help to develop �sheries.
Q3 Below are given names of a few lakes of India. Group them under two categories –
natural and created by human beings
Answer.
Q4 Discuss the signi�cant difference between the Himalayan and the Peninsular rivers.
Answer. Difference between the Himalayas and Peninsular rivers are as follows
Page 3 of 5 Aglasem Schools
Page 5
Book - Contemporary India-I Ncert Solutions | Chapter-3 Geography
Q5 Compare the east �owing and the west �owing rivers of the Peninsular plateau.
Answer. The difference between east �owing rivers and west �owing rivers are
Q6 Why are rivers important for the country’s economy?
Answer. Rives are important for the country’s economy because water from the rivers is a
basic natural resource essential for various human activities. These are
1. The rivers provide water for irrigation.
2. They provide fertility to the soil.
Page 4 of 5 Aglasem Schools
Q5 Compare the east �owing and the west �owing rivers of the Peninsular plateau.
Answer. The difference between east �owing rivers and west �owing rivers are
Q6 Why are rivers important for the country’s economy?
Answer. Rives are important for the country’s economy because water from the rivers is a
basic natural resource essential for various human activities. These are
1. The rivers provide water for irrigation.
2. They provide fertility to the soil.
Page 4 of 5 Aglasem Schools
Page 6
Book - Contemporary India-I Ncert Solutions | Chapter-3 Geography
3. They are useful for navigation
4. They help to generate hydro-electricity.
5. They help to develop tourism.
6. They provide water for various domestic uses.
7. They provide livelihood to �shermen.
8. They help to moderate the climate and environment of nearby areas.
Page 5 of 5 Aglasem Schools
3. They are useful for navigation
4. They help to generate hydro-electricity.
5. They help to develop tourism.
6. They provide water for various domestic uses.
7. They provide livelihood to �shermen.
8. They help to moderate the climate and environment of nearby areas.
Page 5 of 5 Aglasem Schools
Document Details
| Board / Org | NCERT |
| Exam | Class 9 |
| Type | Solution |
| Pages | 6 |
| Updated | 30 Apr 2026 |