Here we provide NCERT Solutions for Class 9 Social Science Chapter 3 – Drainage for English medium students, Which will very helpful for every student in their exams. Students can download the latest NCERT Solutions for Class 9 Social Science Chapter 3 pdf. Now you will get step by step solution to each question. (v) The Brahmaputra river, which is known as Tsangpo in Tibet, carries a smaller volume of water and less silt as it is a cold and dry area. But once it enters India, Brahmaputra is fed by heavy rains, and it carries lot of water and silt.
(vi) The two rivers that flow through troughs are Narmada and Tapi. They form estuaries while
entering the sea.
(vii) River is very beneficial for agricultural purpose and generating hydro-electricity. It provides fisheries, inland channels for transport. Lakes like the Sambhar Lake provide edible salt. They also help develop tourism and provide recreation.
3. Below are given names of a few lakes of India. Group those 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) Hirakud
Natural Lakes: Wular, Dal, Nainital, Bhimtal, Chilika, Pulicat, Sambhar, Barapani, Loktak
Created by human beings: Gobind Sagar, Hirakud, Rana Pratap Sagar, Nagarjuna Sagar, Nizam Sagar
4. Discuss the significant difference between the Himalayan and the Peninsular rivers.
|Himalayan Rivers||Peninsular Rivers|
|Originate from Himalayas||Originate in the Western Ghats|
|These are perennial rivers.||These are seasonal rivers.|
|They receive water from rain as well as from melted snow from the lofty mountains.||These rivers are dependent upon rainfall. During the dry season, even the large rivers have reduced flow of water|
5. Compare the east-flowing and the west-flowing rivers of the Peninsular Plateau.
|East Flowing Rivers||West Flowing Rivers|
|Major rivers flowing eastwards: Mahanadi, Godavari, Krishna, Kaveri||Only two long rivers flow westwards: Narmada, Tapi|
|These rivers drain in the Bay of Bengal.||These rivers drain in the Arabian sea.|
|Carry greater amount of sediments, so form deltas at their mouths||Carry lesser amount of sediments, so form estuaries at their mouths|
|Greater number of tributaries||Lesser number of tributaries|
|These river flow not through very deep canals.||These rivers flow in troughs.|
6. Why are rivers important for the country’s economy?
The rivers important for the country’s economy because:
→ It is source of natural fresh water which is required for the survival of most of the animals including human.
→ The water from the rivers is used for various domestic, industrial and agricultural purposes.
→ The presence of rivers boosts trade and commerce by helping in the easy transport of goods. They are also a potential source of energy.
→ The water from rivers is used for running hydro-electric dams.
→ It is also used for navigation and transport thus, important for commercial activities.
→ It also provides fishing and great scenic and recreational value. Thus,serve as good tourist spots.
(i) On an outline map of India mark and label the following rivers: Ganga, Satluj, Damodar, Krishna, Narmada, Tapi, Mahanadi, and Brahmaputra.
(ii) On an outline map of India mark and label the following lakes: Chilika, Sambhar, Wular, Pulicat, Kolleru.
Page No: 25
1. Nagarjuna Sagar is a river valley project. Name the river?
2. The longest river of India.
3. The river which originates from a place known as Beas Kund.
4. The river which rises in the Betul district of MP and flows westwards.
5. The river which was known as the “Sorrow” if West Bengal.
6. The river on which the reservoir for Indira Gandhi canal has been built.
7. The river whose source lies near Rohtang Pass.
8. The longest river of Peninsular India.
9. A tributary of Indus originating from Himachal Pradesh.
10. The river flowing through fault, drains into the Arabian Sea.
11. A river of South India, which receives rain water both in summer and winter.
12. A river which flows through Ladakh, Gilgit and Pakistan.
13. A important river of the Indian desert.
14. The river which joins Chenab in Pakistan.
15. A river which rises at Yamunotri glacier.
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