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Ncert Solutions Class 9 Social Science Geography Chapter 3 Drainage

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Mathematics – Iii

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Chapter 3 – Drainage

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) Punjab (c) Uttar Pradesh (d) Jammu and Kashmir

Answer:

Jammu and Kashmir.

(ii) The river Narmada has its source at

(a) Satpura (b) Amarkantak (c) Brahmagiri (d) Slopes of the Western Ghat.

Answer:

Amarkantak

(iii) Which one of the following lakes is a saltwater lake?

(a) Sambhar (b) Wular (c) Dal (d) Gobind Sagar

Answer:

Sambhar

(iv) Which one of the following is the longest river in Peninsular India?

(a) Narmada (b) Godavari (c) Krishna (d) Mahanadi

Answer:

Godavari

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

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

Answer:

Tapi

Answer the following questions briefly.

(i) What is meant by a water divide? Give an example.

Answer:

Any elevated area, such as a mountain or an upland, separates two drainage basins. Such an upland is

known as a water divide. For example, 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:

Indus river origin - Near Manasarovar Lake, Tibet

Ganga River origin - Gangotri glacier in Uttaranchal

(iv) Name the two headstreams of the Ganga. Where do they meet to form the Ganga?

Answer:

The two headstreams of Ganga are Alaknanda and Bhagirathi. They both meet to form Ganga at Devprayag.

(v) Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?

Answer:

In Tibet, the river carries a smaller volume of water and less silt as it is a cold and a dry area. In India, it passes through a region of high rainfall. Here the river carries a large volume of water and a considerable amount of silt.

(vi) Which two Peninsular rivers flow through trough?

Answer:

Narmada and Tapi are the two Peninsular rivers that flow through the trough.

(vii) State some economic benefits of rivers and lakes.

Answer:

Dependent on rainfall. During dry seasons, the rivers get dried up.
Compare the east-flowing and the west-flowing rivers of the Peninsular plateau.

Answer:

West flowing rivers:

There are only 2 long West flowing rivers - Narmada and Tapi.
They flow into the Arabian Sea
They have a lesser number of tributaries
Form estuaries
Carry lesser sediments.

East flowing rivers:

Many major rivers Mahanadi, Cauvery, Godavari, Krishna
They flow into the Bay of Bengal
Have many tributaries
Forms Deltas
Carry larger sediments than West flowing rivers.
Why are rivers important for the country’s economy?

Answer:

Rivers have been of fundamental importance throughout human history. Water from 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. Make a list of cities in your state which are 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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