Drainage – Class 9 IX – Geography Social Science – Textbook NCERT Solutions

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TEXTBOOK   QUESTIONS   SOLVED

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

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Ans. :  B

(ii) In which of the following states is the Wular lake located?
(a) Rajasthan
(b) Uttar Pradesh
(c) Punjab
(d) Jammu and Kashmir

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Ans. :  D

(iii) The river Narmada has its source at
(a) Satpura
(b) Brahmagiri
(c) Amarkantak
(d) Slopes of the Western Ghats

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Ans. :  C

(iv) Which one of the following lakes is a salt water lake?
(a) Sambhar
(b) Dal
(c) Wular
(d) Gobind Sagar

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Ans. :  A

(v) Which one of the following is the longest river of the Peninsular India?
(a) Narmada
(b) Krishna
(c) Godavari
(d) Mahanadi

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Ans. :  C

(vi) Which one amongst the following rivers Mows through a rift valley?
(a) Mahanadi
(b) Tungabhadra
(c) Krishna
(d) Tapi

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Ans. :  A

Q2. Answer the following questions briefly:
(i) What is meant by a water divide? Give an example.

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Ans. : (i) An elevated area, such as a mountain or an upland, that separates two drainage basins is known as water divide. Example — The water divide between the Indus and the Ganga. river system. Ambala is situated on this water divide.

(ii) Which is the largest river basin in India?

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Ans. : (ii) Ganga river basin is the largest one in India. The length of this river basin is over 2500 km.

(iii) Where do the rivers Indus and Ganga have their origin?

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Ans. : (i) The river Indus has its origin in Tibet, near Lake Mansarovar. The river Ganga originates at the Gangotri glacier on the southern slopes of the Himalayas.

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

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Ans. : (iv) The two head.strearns of the Ganga – Bhagirathi and Alaknanda. They meet to form the Ganga at Devapravag in Uttarakhand.

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

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Ans. : (i) The Brahmaputra in its Tibetan part carries a smaller volume of water and less silt as it is a cold and a dry area.
Narmada and Tapi are the two peninsular rivers that flow through trough.

(vi) Which two Peninsular rivers flow through trough?

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Ans. :
Economic benefits of rivers:
• They provide water which is a basic natural resource essential for various human activities.
• They are used for irrigation, navigation and hydro power generation.
• They moderate the climate of the surroundings and maintain the aquatic ecosystem.
Economic benefits of lakes:
• They help to regulate the flow of a river.
• During heavy rainfall, they prevent flooding and during the dry season, they help to maintain an even flow of water.
• They also moderate the climate of the surroundings and maintain the aquatic ecosystem.
• They help develop tourism.

Q3 .  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 Sugar                     (f) Loktak
(g) Barapani                             (h) Chilika
(i) Sambhar                              (j) Rana Pratap Sagar
(k) Nizam Sugar                      (l) Pulicat
(m) Nagarjuna Sugar             (n) Hirakund

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Ans.

Natural LakesLakes created by human beings
(a) Wular
(b) Dal
(c) Nainital
(d) Bhimtal
(1) Loktak
(g) Barapani
(h) Chilika
(i) Sambhar
(I) Pulicat
(e) Gobind Sagar
(j) Rana Pratap Sugar
(k) Nizam Sugar
(m) Nagarjuna Sagar
(n) Hirakund


Q4 . Discuss the significant differences between the Himalayan and the Peninsular rivers.

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Ans.

The Himalayan riversThe Peninsular rivers
(i) They are mostly perennial. They depend not only on rainfall but
also on melting of snow.
(ii) They perform intensive erosional activity in the upper courses.
(iii) The Himalayan rivers have long courses from their source of mouth.
(iv) These rivers bring new alluvium and enrich the plains. Therefore, they
are good for agriculture.
(v) Ganga, Indus and Brahmaputra are the major Himalayan rivers.
(i) They are mostly seasonal in nature. They
depend on rain-fall only.
(ii) They hardly perform erosional activity even
in their upper courses.
(iii) The peninsular rivers have shorter and
shallower courses.
(iv) These rivers do not spread silt. Moreover,
no major plains are found in the peninsular plateau. Fertile lands can be found only in small deltas.
(v) Mahanadi, Godavari, Krishna, Kaveri, Narmada and Tapi are the major Peninsular rivers.

 


Q5. Compare the east flowing and the west flowing rivers of the peninsular plateau.

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Ans.

The east flowing riversThe west flowing rivers
(i) The Mahanadi, the Godavari, the Krishna
and the Kaveri are the major east flowing rivers of peninsular plateau.
(ii) These rivers drain into the Bay of Bengal.
(i) These rivers form deltas on the east coast.
(iv) These rivers have a developed and large tributary system.
(i) The Narmada and the Tapi are the major west flowing rivers of the peninsular plateau.
(ii) These rivers drain into the Arabian Sea.
(iii) These rivers do not form any delta. They form estuaries.
(iv) These rivers are devoid of any developed
tributary system.

 


Q6. Why are rivers important for the country’s economy?

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Ans.
Rivers are important for the country’s economy in the following ways:
(i) Rivers provide water which is a basic natural resource and is essential for various human activities.
(ii) The river banks have attracted settlers from ancient times. These settlements have now become big cities.
(iii) River water is used in irrigation, navigation and hydro-power generation.
(iv) Agriculture, which is the backbone of the country, is possible only because of the rivers.
(v) Rivers moderate the climate of the surroundings and maintain the aquatic ecosystem.
(vi) They prevent flood during heavy downpour.

MAP SKILLS
(i) On an outline map of India, mark and label the following rivers: Ganga, Satluj, Yamuna, Krishna, Narmada, Tapi, Mahanadi, and Brahmaputra.

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Ans. 


(ii) On an outline map of India, mark and label the following lakes: Chililca, Sambhar, Wular, Pulikat and Kolleru.

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Ans.


PROJECT/ ACTIVITY

Solve this crossword puzzle with the help of given clues.
Across
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” of 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.
Down
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. An 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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Ans.

AcrossDown
1. Krishna9. Chenab
2. Ganga10. Narmada
3. Beas11.  Kaveri
4. Tapi12. Indus
5. Damodar13.  Luni
6. Satluj14. Jhelum
7. Ravi15. Yamuna
8. Godavari


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