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NCERT Class 9 Geography | Ch 3: Drainage – Complete Solutions

Chapter 3: Drainage

Complete NCERT Solutions (Exercise) | CBSE Class 9 Social Science Geography
NCERT Exercise: Choose the Right Answer
1(i)1 markNCERT Page 23
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.
1(ii)1 markNCERT Page 24
The river Narmada has its source at:
(a) Satpura
(b) Brahmagiri
(c) Amarkantak
(d) Slopes of the Western Ghats
Answer: (c) Amarkantak.
1(iii)1 markNCERT Page 24
Which one of the following lakes is a salt water lake?
(a) Sambhar
(b) Dal
(c) Wular
(d) Gobind Sagar
Answer: (a) Sambhar.
1(iv)1 markNCERT Page 24
Which one of the following is the longest river of the Peninsular India?
(a) Narmada
(b) Krishna
(c) Godavari
(d) Mahanadi
Answer: (c) Godavari.
1(v)1 markNCERT Page 24
Which one amongst the following rivers flows through a rift valley?
(a) Mahanadi
(b) Tungabhadra
(c) Krishna
(d) Tapi
Answer: (d) Tapi.
Brief Answer Questions
2(i)2 marksNCERT Page 24
What is meant by a water divide? Give an example.
Answer: A water divide is an elevated area, such as a mountain or upland, that separates two drainage basins. It decides the direction in which streams and rivers flow. Example: Ambala is located on the water divide between the Indus and the Ganga river systems.
2(ii)1 markNCERT Page 24
Which is the largest river basin in India?
Answer: The Ganga river basin is the largest river basin in India.
2(iii)2 marksNCERT Page 24
Where do the rivers Indus and Ganga have their origin?
Answer: The river Indus rises in Tibet near Lake Mansarowar. The headwaters of the Ganga, called the Bhagirathi, are fed by the Gangotri Glacier in Uttarakhand.
2(iv)2 marksNCERT Page 24
Name the two headstreams of the Ganga. Where do they meet to form the Ganga?
Answer: The two headstreams of the Ganga are the Bhagirathi and the Alaknanda. They meet at Devaprayag in Uttarakhand to form the Ganga.
2(v)2 marksNCERT Page 24
Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?
Answer: In Tibet, the Brahmaputra flows through a cold and dry region. Therefore, it carries a smaller volume of water and less silt despite having a longer course. When it enters India, it passes through areas of heavy rainfall and carries a large volume of water and a considerable amount of silt.
2(vi)1 markNCERT Page 24
Which two Peninsular rivers flow through trough?
Answer: The Narmada and the Tapi are the two Peninsular rivers that flow through trough or rift valleys.
2(vii)3 marksNCERT Page 24
State some economic benefits of rivers and lakes.
Answer: Rivers and lakes provide several economic benefits. Rivers supply water for irrigation, domestic use, industries and hydroelectric power generation. They also support navigation, fishing and settlement growth along riverbanks. Lakes help regulate river flow, prevent floods during heavy rains, maintain water supply during dry seasons, support tourism, provide recreation and help develop hydel power.
Classification Question
33 marksNCERT Page 24
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 Created by Human Beings
Wular Gobind Sagar
Dal Rana Pratap Sagar
Nainital Nizam Sagar
Bhimtal Nagarjuna Sagar
Loktak Hirakund
Barapani
Chilika
Sambhar
Pulicat
Long Answer Questions
45 marksNCERT Page 24
Discuss the significant difference between the Himalayan and the Peninsular rivers.
Answer:
Himalayan Rivers Peninsular Rivers
Most Himalayan rivers are perennial and have water throughout the year. Most Peninsular rivers are seasonal and depend mainly on rainfall.
They receive water from both rainfall and melting snow from the Himalayas. They receive water mainly from monsoon rainfall.
They have long courses from their source to the sea. They have shorter and shallower courses as compared to Himalayan rivers.
They perform intensive erosional activity in the upper courses and form meanders, oxbow lakes and deltas in the lower courses. They flow over hard rocky surfaces and usually have fewer depositional features.
Examples include the Indus, the Ganga and the Brahmaputra. Examples include the Narmada, Tapi, Godavari, Krishna, Mahanadi and Kaveri.
55 marksNCERT Page 24
Compare the east flowing and the west flowing rivers of the Peninsular plateau.
Answer:
East Flowing Rivers West Flowing Rivers
Most major Peninsular rivers flow eastwards. Only a few Peninsular rivers flow westwards.
They drain into the Bay of Bengal. They drain into the Arabian Sea.
They form deltas at their mouths. They form estuaries at their mouths.
Their drainage basins are comparatively larger. Their drainage basins are comparatively smaller.
Examples include the Mahanadi, Godavari, Krishna and Kaveri. Examples include the Narmada and Tapi.
They generally do not flow through rift valleys. The Narmada and Tapi flow through rift valleys.
65 marksNCERT Page 24
Why are rivers important for the country’s economy?
Answer: Rivers are important for the country’s economy because they provide water, which is a basic natural resource required for many human activities. Riverbanks have attracted settlements since ancient times, and many of these settlements have grown into large cities.

Rivers are especially important for agriculture because they provide water for irrigation. They are also used for navigation, hydroelectric power generation, fishing, domestic water supply and industrial use. In a country like India, where agriculture supports a large section of the population, rivers play a major role in economic development.
Map Skills
Map 1ActivityNCERT Page 24
On an outline map of India mark and label the following rivers:
Ganga, Satluj, Damodar, Krishna, Narmada, Tapi, Mahanadi, and Brahmaputra.
Answer: This is a map-based activity. Students should mark and label the given rivers on an outline map of India with the help of the textbook map or an atlas.
Map 2ActivityNCERT Page 24
On an outline map of India mark and label the following lakes:
Chilika, Sambhar, Wular, Pulicat, Kolleru.
Answer: This is a map-based activity. Students should mark and label the given lakes on an outline map of India with the help of the textbook map or an atlas.
Project / Activity
ActivityProjectNCERT Page 25
Solve this crossword puzzle with the help of given clues.

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” of 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 rainwater both in summer and winter.
12. A river which flows through Ladakh, Gilgit and Pakistan.
13. An important river of the Indian desert.
14. The river which joins Chenab in Pakistan.
15. A river which rises at Yamunotri glacier.
NCERT Activity: This is a crossword-based activity. The answers are:

Across:
1. Krishna
2. Ganga
3. Beas
4. Tapi
5. Damodar
6. Satluj
7. Ravi
8. Godavari

Down:
9. Chenab
10. Narmada
11. Kaveri
12. Indus
13. Luni
14. Jhelum
15. Yamuna

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