NCERT Solutions For Class 9 Geography Chapter 3 Drainage
Chapter 3 Drainage Class 9
Question 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 (c) Centrifugal
(b) Dendritic (d) Trellis
(ii) In which of the following states is the Wular lake located?
(a) Rajasthan (c) Punjab
(b) Uttar Pradesh (d) Jammu and Kashmir
(iii) The river Narmada has its source at
(a) Satpura (c) Amarkantak
(b) Brahmagiri (d) Slopes of the Western Ghats
(iv) Which one of the following lakes is a salt water lake?
(a) Sambhar (c) Wular
(b) Dal (d) Gobind Sagar
(v) Which one of the following is the longest river of the Peninsular India?
(a) Narmada (c) Godavari
(b) Krishna (d) Mahanadi
(vi) Which one amongst the following rivers flows through a rift valley?
(a) Mahanadi (c) Krishna
(b) Tungabhadra (d) Tapi
- (b) Dendritic
- (d) Jammu and Kashmir
- (c) Amarkantak
- (a) Sambhar
- (c) Godavari
- (d) Tapi
Question 2. Answer the following questions briefly.
(i) What is meant by a water divide? Give an example.
Answer:- an elevated area, such as a mountain or an upland, separates two drainage basins. Such an upland is known as a water divide. For example: Ambala is located on the water divide between the Indus and the Ganga river systems.
(ii) Which is the largest river basin in India?
Answer:- Ganga river basin is the largest river basin in India.
(iii) Where do the rivers Indus and Ganga have their origin?
Answer:- Origin of Indus river is – Near Manasarovar Lake, Tibet.
Origin of Ganga River is – Gangotri glacier in Uttaranchal
(iv) Name the two headstreams of the Ganga. Where do they meet to form the Ganga?
Answer:- Alakananda and Bhagirathi are the two headstreams of the river Ganga. They meet at Devaprayag in Uttarakhand.
(v) Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?
Answer:- Despite a longer course, the Brahmaputra in its Tibetan part have less silt, because it receives a very little volume of water in Tibet.
(vi) Which two Peninsular rivers flow through trough?
Answer:- Narmada and Tapi are the two Peninsular rivers flow through trough.
(vii) State some economic benefits of rivers and lakes.
Answer:- Rivers help to provide water for drinking, irrigation, industrial purpose etc. They help to develop fisheries. They enhance natural beauty and help in the development of tourism and provide recreation.
Question 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:- Wular, Dal, Nainital, Bhimtal, Loktal, Chilika, Pulicat, Sambhar, Barapani.
Man-made lakes:- Gobind Sagar, Rana Pratap Sagar, Nizam Sagar, Nagarjuan Sagar, Hirakud.
Question 4. Discuss the significant difference between the Himalayan and the Peninsular rivers.
These are perennial rivers.
These are seasonal rivers
Receive water from Rains and Snowfall.
Dependent on rainfall. During dry seasons, the rivers get dried up.
Question 5. Compare the east flowing and the west flowing rivers of the Peninsular plateau.
West flowing rivers:
East flowing rivers:
There are only 2 long West flowing rivers – Narmada and Tapi.
Many major rivers Mahanadi, Cauvery, Godavari, Krishna
They flow into the Arabian Sea
They flow into the Bay of Bengal
They have a lesser number of tributaries
Have many tributaries
Carry lesser sediments
Carry larger sediments than West flowing rivers
Question 6. Why are rivers important for the country’s economy?
Answer:- Rivers provide very cheap and efficient inland transport for many trades and commerce. They also help cities and towns to carry their wastes. Their water is mainly used for irrigation and for developing hydroelectricity.