NCERT Solutions Class 9th Social Science (Geography) Chapter – 3 Drainage Question & Answer

May 28, 2022

NCERT Solutions Class 9th Social Science (Geography) Chapter – 3 Drainage

Textbook	NCERT
Class	9^th
Subject	Social Science (Geography)
Chapter	3^rd
Chapter Name	Drainage
Category	Class 9th Social Science (Geography)
Medium	English
Source	Last Doubt

NCERT Solutions Class 9th Social Science (Geography) Chapter – 3 Drainage

Chapter – 3

Drainage

Question Answer

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
(b) Dendritic
(c) Centrifugal
(d) Trellis

Answer – (b) Dendritic pattern.

(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 state.

(iii) The river Narmada has its source at

(a) Satpura
(b) Brahmagiri
(c) Amarkantak
(d) Slopes of 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 lake

(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 river

(vi) Which one amongst the following rivers flows through a rift valley?

(a) Mahanadi
(b) Thngabhadra
(c) Krishna
(d) Tapi

Answer – (d) Tapi river

Question 2. Answer the following questions briefly.

(i) What is meant by the water divide? Give an example.
Answer – Any elevated area, such as a mountain or upland, separates two drainage basins. Such upland is known as the water divide. 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 – The Ganga basin is the largest basin in India.

(iii) Where do the rivers Indus and Ganga have their origin?
Answer – The headwaters of the Ganga called the ‘Bhagirathi’ is fed by the Gangotri Glacier and joined by the Alaknanda at Devaprayag in Uttaranchal. At Haridwar, the Ganga emerges from the mountains on to the plains. The Indus flows through Baltistan and Gilgit and emerges from the mountains at Attock.

(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 Ganga. They meet at Devaprayag.

(v) Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?
Answer – The Brahmaputra river, which is known as Tsangpo in Tibet, receives a very little volume of water in Tibet so it has less silt there. On the other hand, this very river when enters India it passes through such a region which receives heavy rainfall. As such in India, it carries a large volume of water and a larger amount of silt.

(vi) Which two Peninsular rivers flow through trough?
Answer – Narmada and Tapi are the two Peninsular rivers, which flow through the trough.

(vii) State some economic benefits of rivers and lakes.
Answer – Economic benefits of rivers :

• Rivers provide water which is a basic natural resource for various human activities.

• They are used for irrigation, navigation and generation of hydroelectric power.

• They have a moderating influence on the climate of the surroundings and maintain the aquatic ecosystem.

Economic benefits of lakes:

• They help to regulate the flow of a river.

• They prevent flooding at times of heavy rainfall and during the dry season, they help to maintain an even flow of water.

• They also have a moderating influence on the surrounding climatic conditions and maintain the aquatic ecosystem.

• They enhance the natural beauty and recreational activities by encouraging tourism.

• Lakes are also used for the generation of hydroelectricity.

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:
(a) Wular
(b) Dal
(c) Nainital
(d) Bhimtal
(f) Loktak
(g) Barapani
(h) Chilika
(i) Sambhar
(l) Pulicat

Lakes Created human beings:
(e) Gobind Sagar
(j) Rana Pratap Sagar
(k) Nizam Sagar
(m) Nagarjuna Sagar
(n) Hirakund

Question 4. Discuss the significant difference between the Himalayan and the Peninsular rivers.
Answer –

The Himalayan Rivers	The Peninsular Rivers
(i)They are perennial rivers. They get water from both the melted snow and of heavy rainfall.	(a)They are seasonal in nature. They depend on rainfall only.
(ii)They perform an immense erosional activity in the upper course.	(b)They do not perform any erosional activity in the upper course.
(c)They have long courses from their source to the mouth.	(c)They have shorter and shallower course.
(d)They carry large amount of silt and sand, which is renewed every year by annual floods. Therefore they are good for agriculture.	(d)These river do not carry much silt, there are no major plains. Fertile lands are only found in the small delta areas.
(e)The Ganga, the Indus, the Brahmaputra are major Himalayan rivers.	(e)The Mahanadi, the Godavari, the Krishna, the Kaveri, the Narmada and the Tapi are major Peninsular rivers.

Question 5. Compare the east-flowing and the west-flowing rivers of the Peninsular plateau.

Answer –

The East Flowing Rivers	The West Flowing Rivers
(i)The Mahanadi, the Godavari, the Krishna, and the Kaveri are the east-flowing rivers of Peninsular India.	(i)The Narmada and the Tapi are the major west-flowing rivers of Peninsular India.
(ii)These rivers drain into the Bay of Bengal.	(ii)These rivers drain into the Arabian Sea.
(iii)These rivers form deltas on the east coast.	(iii)These rivers form estuaries on the west coast.
(iv)These rivers have a developed and large tributary system.	(iv)These rivers are devoid of any developed tributary system.

Question 6. Why are rivers important for the country’s economy?
Answer – Rivers have been of fundamental importance throughout human history. Water from the rivers is a basic natural resource, essential for various human activities. Therefore, the riverbanks have attracted settlers from ancient times.

These settlements have now become big cities. Make a list of cities in your state, which is located on the bank of a river. Using rivers for irrigation, navigation, hydropower generation is of special significance – particularly to a country like India, where agriculture is the major source of livelihood of the majority of its population.

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