NCERT Solutions for Class 9 Geography Chapter 3 – Drainage (Social Science), contains solutions to various questions in Exercise for Chapter 3. At the end of the Solutions, all the keywords which are important to understand Drainage Class 9 Geography, have been explained in a simple and easy to understand manner. NCERT Solutions for Class 9 Social Science help to check the concept you have learnt from detailed classroom sessions and application of your knowledge.
| Category | NCERT Solutions for Class 9 |
| Subject | Geography (Social Science) |
| Chapter | Chapter 3 – Drainage |
Download NCERT Solutions for Class 9 Geography Chapter 3 – Drainage
NCERT Solutions for Class 9 Geography Chapter 3 – Drainage – NCERT Exercises
Ques.1: Choose the right answer from the four alternatives given below.
i. In which of the following states is the Wular lake located?
(a) Rajasthan
(b) Uttar Pradesh
(c) Punjab
(d) Jammu and Kashmir
Answer
Answer: (d) Jammu and Kashmir
ii. The river Narmada has its source at
(a) Satpura
(b) Brahmagiri
(c) Amarkantak
(d) Slopes of the Western Ghats
Answer
Answer: (b) Amarkantak
(iii) Which one of the following lakes is a saltwater lake?
(a) Sambhar
(b) Dal
(c) Wular
(d) Gobind Sagar
Answer
Answer: (a) Sambhar
(iv) Which one of the following is the longest river in Peninsular India?
(a) Narmada
(b) Krishna
(c) Godavari
(d) Mahanadi
Answer
Answer: (c) Godavari
(v) Which one amongst the following rivers flows through a rift valley?
(a) Mahanadi
(b) Tungabhadra
(c) Krishna
(d) Tapi
Answer
Answer: (d) Tapi
Ques.2: Answer the following questions briefly.
(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 flow through troughs?
(vii) State some economic benefits of rivers and lakes.
Ans.2:
(i) An elevated area that separates two drainage basins is known as a water divide. For example, Ambala forms a water divide between the Indus and Ganga river systems.
(ii) The largest river basin in India is the Ganga River basin.
(iii) The Indus river originates near the Mansarovar Lake in Tibet. The river Ganga has its origin in the Gangotri glacier in Uttarakhand.
(iv) Alaknanda and Bhagirathi are the two headstreams of the river Ganga. They join at Devprayag to form Ganga.
(v) The Brahmaputra has less silt despite a longer course in Tibet as the river in Tibet carries less volume of water, thereby also carrying silt in low amount. Moreover, as the region is cold and dry, it is not fed by rain.
(vi) The two Peninsular rivers flowing through trough are Narmada and Tapi.
(viii) The rivers and lakes are of great economic importance. They provide us with water which is the basic requirement for life. They provide us with ways of navigation and travel which is beneficial for economic purposes. Hydropower plants could be set up easily on the rivers to generate electricity. Water for irrigation can be taken from both rivers and lakes. Lakes also help in maintaining the flow of the rivers and support many aquatic ecosystems.
Ques.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
Ans.3:
| Natural lakes | Manmade lakes |
| Wular | Gobind Sagar |
| Dal | Rana Pratap Sagar |
| Nainital | Nizam Sagar |
| Bhimtal | Hirakund |
| Loktak | Nagarjuna Sagar |
| Barapani | |
| Chilika | |
| Sambhar | |
| Pulicat |
Ques.4: Discuss the significant difference between the Himalayan and the Peninsular rivers.
Ans.4:
| Himalayan Rivers | Peninsular Rivers |
| These rivers originate in the Himalayan mountains. | These rivers originate in the Western Ghats. |
| Depending on the source of their origin, these rivers are perennial as these are fed by the Himalayan glaciers. | These rivers are non-perennial, which means that they dry out in summers as they are rain-fed. |
| These rivers have long courses and drain into the seas, forming deltas. | These rivers have shorter courses and are shallower. |
| These rivers cause erosion in the upper course. They form ox-bow lakes and meanders in the middle course and deposit silt and sediments in the last course, forming deltas. | These rivers generally do not have much longer lengths. Though they form deltas, they are smaller in size as compared to the Himalayan rivers. |
Ques.5: Compare the east-flowing and the west-flowing rivers of the Peninsular plateau.
Ans.5:
| East-flowing Rivers | West-flowing Rivers |
| These rivers flow from west to east. | These rivers flow from east to west. |
| Major east-flowing rivers are Mahanadi, Godavari, Krishna, and Kaveri. | Major west-flowing rivers are Narmada and Tapi. |
| These rivers drain in the Bay of Bengal. | These rivers drain in the Arabian Sea. |
| These rivers have more tributaries compared to west-flowing rivers. | These rivers have lesser tributaries as compared to the east-flowing rivers. |
| These rivers form deltas at their mouths as they carry huge amounts of silt and sediments. | These rivers form estuaries at their mouths. |
Ques.6: Why are rivers important for the country’s economy?
Ans.6: Rivers are important for a country’s economy for the following reasons:
a) Rivers provide us with freshwater which is the basic requirement for life.
b) They provide us with ways of navigation and travel which is beneficial for economic purposes.
c) Hydropower plants could be set up on the rivers to generate electricity.
d) Water from rivers can be used for irrigation.
e) Water from rivers can also be used as a coolant in industries.
f) Rivers also serve as a good source for recreation, example fishing.
Important Terms Relevant for NCERT Solutions for Class 9 Geography Chapter 3 – Drainage
Drainage: The river system of an area.
Drainage basin: The area drained by a river.
Water divide: An elevated area that separates two drainage basins
Perennial rivers: Rivers that flow throughout the year.
Non-perennial rivers: The seasonal rivers that flow only during monsoons.
River system: A river with its tributaries.
NCERT Solutions for Class 9 Geography (Social Science)