NCERT Solutions for Class 9 Social Science Geography Chapter 3 Drainage provide comprehensive answers to the questions posed in the chapter. These solutions aim to enhance students’ understanding of drainage systems, rivers, and related concepts. The solutions are presented in a clear and concise manner, helping students grasp the key concepts effectively and prepare for exams with confidence.
NCERT Solutions for Class 9 Social Science Geography Contemporary India Chapter 3 Drainage Questions and Answers
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 (c) Centrifugal
(b) Dendritic (d) Trellis
Ans : Dendritic
(ii) In which of the following states is the Wular Lake located?
(a) Rajasthan (c) Punjab
(b) Uttar Pradesh (d) Jammu and Kashmir
Ans : Jammu and Kashmir
(iii) The river Narmada has its source at
(a) Satpura (c) Amarkantak
(b) Brahmagiri (d) Slopes of the Western Ghats
Ans : Amarkantak
(iv) Which one of the following lakes is a saltwater lake?
(a) Sambhar Lake (c) the Wular Lake
(b) Dal Lake (d) Gobind Sagar Lake
Ans : Sambhar Lake
(v) Which one of the following is the longest river of Peninsular India?
(a) Narmada (c) Godavari
(b) Krishna (d) Mahanadi
Ans : Godavari
(vi) Which one amongst the following rivers flows through a rift valley?
(a) Mahanadi (c) Krishna
(b) Tungabhadra (d) Tapi
Ans : Tapi
Q2. Answer the following questions briefly.
(i) What is meant by a water divide? Give an example.
Ans : Water divide indicates that a mountain or an upland, separates two drainage basins systems in any elevated area. Such an upland is known as the water divide.
For example, Ambala is located on the water divide between the Ganga and Indus river system
(ii) Which is the largest river basin in India?
Ans : The largest river basin in India is the Ganga river basin is over 2500 km in length.
(iii) Where do the rivers Indus and Ganga have their origin?
Ans : The Indus River originates from the north of the mountain ranges in Tibet near Lake Mansarovar and enters India in the Ladakh district of Jammu and Kashmir. The Ganges River originates from the Gangotri Glacier in Uttarakhand.
(iv) Name the two headstreams of the Ganga. Where do they meet to form the Ganga?
Ans : The two headstreams of the Ganga are ‘Bhagirathi’ fed by the Gangotri glacier and Alaknanda. Both form the Ganga river at Devprayag.
(v) Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?
Ans : In Tibet, The Brahmaputra river is known as the Tsang Po, the river collects a smaller volume of water and less silt as it is cold and On the other side In India, it passes through the region of high rainfall. So here the river collects a large volume of water and a considerable amount of silt.
(vi) Which two Peninsular rivers flow through troughs?
Ans : The Narmada Basin and The Tapi Basin are the two Peninsular rivers that flow through troughs.
(vii) State some economic benefits of rivers and lakes.
Ans : Some economic benefits of rivers and lakes are:-
(a) During heavy rains, the lake prevents flooding and during the dry season, the lake helps to maintain an even flow of water.
(b) Lakes can also be used for developing hydel power and maintaining the aquatic ecosystem.
(c) Lake can also help in the development of tourism and provide recreation.
(d) Rivers are useful for irrigation, navigation and hydro-power generation.
(e) Rivers are very important or useful for agriculture and particularly In India, where agriculture is the major source of livelihood for the majority of the population.
Q3. Below are given names of a few lakes of India grouping them under two categories – natural and created by human beings.
(a) Wular (b) Dal
(c) Nainital (d) Bhimtal
(e) Govind Sagar (f) Loktak
(g) Barapani (h) Chilika
(i) Sambhar (j) Rana Pratap Sagar
(k) Nizam Sagar (l) Pulicat
(m) Nagarjuna Sagar (n) Hirakund
|Natural Lakes||Lakes created by human beings|
|i) Wular ii) Daliii) Nainital iv) Bhimtalv) Loktak vi) Barapanivii) Chilikaviii) Sambharix) Pulicat||i) Govind Sagarii) Rana Pratap Sagariii) Nizam Sagariv) Nagarjuna Sagar v) Hirakund|
Q4. Discuss the significant difference between the Himalayan and the peninsular rivers.
Ans : The difference between the Himalayan and the peninsular rivers are :-
|The Himalayan rivers||The Peninsular rivers|
|i) Himalayan rivers are perennial : it means that they have water throughout the year.||i) Peninsular rivers are seasonal: it means that they have water only for a few months in a year.|
|ii) These rivers receive water from rain as well as from snowfall from the lofty mountains.||ii) These rivers receive water from rainy seasons but remain dry mostly.|
|iii) Two major Himalayan rivers are the Indus and the Brahmaputra.||iii) The major peninsular rivers are the Mahanadi, the Godavari, the Krishna and the Kaveri.|
Q5. Compare the east-flowing and the west-flowing rivers of the peninsular plateau.
|West flowing rivers||East flowing rivers|
|i) There are only two long west-flowing rivers are the Narmada and the Tapi.||i) The major river is the Mahanadi the Godavari the Krishna and the Kaveri|
|ii) They drain(flow) into the Bay of Bengal.||ii) They drain(flow) into the Arabian sea|
|iii) These rivers make deltas at their mouths.||iii) These rivers make estuaries.|
|iv) They have lesser tributaries.||iv) They have many tributaries.|
Q6. Why are rivers important for the country’s economy?
Ans : Rivers have been of fundamental importance throughout human history. Water from the rivers is a basic natural resource, essential for various human activities. Therefore, riverbanks have attracted settlers from ancient times. These settlements have now become big cities.
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.