NCERT Solutions for Class 9 Social science Chapter 3 Drainage are provided here with simple step-by-step explanations. These solutions for Physical Features of India are extremely popular among Class 9 students for Social science Drainage Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the NCERT Book of Class 9 Social science Chapter 3 are provided here for you for free. All NCERT Solutions for class Class 9 Social science are prepared by experts and are 100% accurate.
Question 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
Ans.
(d) Jammu and Kashmir state.
(ii) The river Narmada has its source at
(a) Satpura
(b) Brahmagiri
(c) Amarkantak
(d) Slopes of Western Ghats
Ans.
(c) Amarkantak
(iii) Which one of the following lakes is a salt water lake?
(a) Sambhar
(b) Dal
(c) Wular
(d) Gobind Sagar
Ans.
(a) Sambhar
(iv) Which one of the following is the longest river of the Peninsular India?
(a) Narmada
(b) Krishna
(c) Godavari
(d) Mahanadi
Ans.
(c) Godavari
(v) Which one amongst the following rivers flows through a rift valley?
(a) Mahanadi
(b) Thngabhadra
(c) Krishna
(d) Tapi
Ans.
(d) Tapi
Question 2.
Answer the following questions briefly.
(i) What is meant by a water divide? Give an example.
Ans. Water divide is an elevated area, such as a mountain or an upland, that separates two drainage basins. For example, the water divide between the Indus and the Ganga river system is Ambala.
(ii) Which is the largest river basin in India?
Ans. Ganga river basin is the largest one in India.
(iii) Where do the rivers Indus and Ganga have their origin?
Ans. 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?
Ans. 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?
Ans. The Brahmaputra in its Tibetan part carries a smaller volume of water and less silt as it is a cold and dry area.
(vi) Which two peninsular rivers flow through trough?
Ans. Narmada and Tapi are the two Peninsular rivers that flow through the trough.
(vii) State some economic benefits of rivers and lakes. Ans. 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. 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.
- 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: Himalayan Rivers: 1. These are perennial rivers 2. Receive water from Rains and Snowfall Peninsular Rivers: 1. These are seasonal rivers 2. 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.
Answer: West flowing rivers: 1. There are only 2 long West flowing rivers – Narmada and Tapi. 2. They flow into the Arabian Sea 3. They have a lesser number of tributaries 4. Form estuaries 5. Carry lesser sediments.
East flowing rivers: 1. Many major rivers Mahanadi, Cauvery, Godavari, Krishna 2. They flow into the Bay of Bengal 3. Have many tributaries 4. Forms Deltas 5. Carry larger sediments than West flowing rivers.
Question 6.
Why are rivers important for the country’s economy?
Answer:
Rivers are important for a country’s economy in the following ways:
- The rivers provide water as the basic resource that is used for various activities.
- The river banks have attracted settlers from ancient times. These settlements have now become major cities.
- Rivers provide water for irrigation, navigation, and for the generation of hydroelectric power.
- The rivers have also promoted agriculture, the most important economic activity of a country.
- The rivers tend to have a moderating influence on the climate of the surroundings. They also help to maintain the aquatic ecosystem.
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