NCERT class 9 geography chapter 3 Drainage

                                   NCERT  class 9 ; Geography

                               chapter :3 Drainage

     Textbook questions  

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

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

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

(a) Sambhar  (b) Wular  (c) Dal (d) Gobind sagar  ans - a

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

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

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

(a) Damodar           ( b)Krishna
(b) Tungabhadra   (d) Tapi Ans –(d)
Q2.Answer the following questions briefly. (i) What is meant by a water divide? Give an example. (ii) Which is the largest river basin in India? (iii) Where do the rivers Indus and Ganga have their origin? (iv) Name the two headstreams of the Ganga. Where do they meet to form the Ganga? (v) Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course? (vi) Which two Peninsular rivers flow through trough? (vii) State some economic benefits of rivers and lakes. (i) Any elevated area, such as a mountain or an upland, which separates two drainage basins is known as water divide; for example, the water divide between the Indus and the Ganga river systems. Ambala is located on this water divide. The Western Ghats form the main water divide in Peninsular India. (ii) The Ganga, which is over 2,500 km long, forms the largest river basin in India. (iii) The river Indus rises in Tibet, near Lake Mansarowar.The Ganga originates at the Gangotri Glacier on the southern slopes of the Himalayas. (iv) The two headstreams of the Ganga are Bhagirathi and Alaknanda. They meet to form the Ganga at Devaprayag in Uttarakhand. (v) Since Tibet has a cold and dry climate, the Brahmaputra carries a smaller volume of water and less silt in this region. (vi) Narmada and Tapi are the two peninsular rivers flowing through trough. (vii) Economic benefits of rivers and lakes: (a) Source of fresh water (b) Irrigation (c) Navigation (d) Hydro-power generation (e) Development of tourism Q 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) Hirakud Answer Natural lakes Artificial or man-made lakes Wular Gobind Sagar Dal Rana Pratap Sagar Nainital Nizam Sagar Bhimtal Nagarjuna Sagar Loktak Hirakud Barapani - Chilika - Sambhar - Pulicat -   Q4. Discuss the significant difference between the Himalayan and the Peninsular rivers.

Q5. Compare the east-flowing and the west-flowing rivers of the Peninsular Plateau.

East-flowing rivers of the Peninsular Plateau	West-flowing rivers of the Peninsular Plateau
Major rivers flowing eastwards: Mahanadi, Godavari, Krishna, Kaveri	Only two long rivers flow westwards: Narmada, Tapi
Flow into the Bay of Bengal	Flow into 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

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

Answer:Rivers have been of fundamental importance throughout human history. Rivers, lakes, ice caps, ground water are the fresh water reserves of the Earth. Water is a basic natural resource, essential for various human activities. 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. Regions having rivers are usually of great scenic and recreational value, and hence, serve as good tourist spots.

Map work;

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

Beside major river The Damoder, the Brahmani, the Baitarni and the Subarnrekha are flow toward east .

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

Extra work 

Rivers	Source
Bhagirathi (Ganga)	Gangotri glacier
Yamuna	Yamnotri glacier on the Bandarpunch Peak
Chambal	Janapao Hills in the Vindhya Range
Banas	Aravali Range
Betwa	Bhopal district
Ken	Barner Range
Son	Amarkantak Plateau
Damodar (‘Sorrow of Bengal’)	Chotanagpur plateau
Ramganga River	Garhwal district of Uttarakhand
Ghaghra River	Gurla Mandhata peak, south of Manasarovar in Tibet (river of the trans-Himalayan origin)
The Kali River (border between Nepal and Uttarakhand)	Glaciers of trans-Himalayas
Gandak River	Tibet-Nepal border
Burhi Gandak	Sumesar hills near the India-Nepal border
Kosi (‘Sorrow of Bihar’)	Tumar, Arun and Sun Kosi unite at Triveni north of the Mahabharata Range to form the Kosi.