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Class : 9th, Subject : Geography, Chapter : 3, Chapter Name : Drainage, , , , QI 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, , (ii) In which of the following states is the Wular lake located?, (a) Rajasthan, , (b) Uttar Pradesh, , (c) Punjab, , (d) Jammu and Kashmir, , (iii) The river Narmada has its source at, (a) Satpura, , (b) Brahmagiri, , (c) Amarkantak, , (d) Slopes of the Western Ghats, , (iv) Which one of the following lakes is a salt water lake?, (a) Sambhar, , (b) Dal, , (c) Wular, , (d) Gobind Sagar, , (v) Which one of the following is the longest river of the Peninsular India?, (a) Narmada, , (b) Krishna, , (c) Godavari, , (d) Mahanadi, , (vi) Which one amongst the following rivers flows through a rift valley?, (a) Mahanadi, (b) Tungabhadra
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(c) Krishna, (d) Tapi, , Answer. (i) (b) Dendritic, (ii) (d) Jammu and Kashmir, (iii) (c) Amarkantak, , (iv) (a) Sambhar, , (v) (c) Godavari, , (vi) (d) Tapi, , Page : 23 , Block Name : Exercise, , 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., , Answer. (i) Any elevated area such as a mountain or an upland that separate two drainage, basins is called a water divide. An example are the Western Ghats., , (ii) The Ganga Basin is the largest river basin in India., , (iii) The river Indus rises in Tibet. near lake Mansarovar. and the Ganga originates at the, Gangotri Glacier. Both of them have their origin in the Himalayas., , (iv) The two head streams of the Ganga are the Bhagirathi and Alaknanda. They meet at, Devprayag in Uttarakhand to form the Ganga., , (v) In Tibet. the river Indus known as Tsang Po carries a smaller volume of water and less, silt as it is a cold and dry area., , In India. the river carries a large volume of water and considerable amount of silt because it, passes through a region of high rainfall., , (vi) Narmada and Tapi are two peninsular rivers, which flow through a trough., , (vii) Lakes, , © Lakes are of a great value to human beings., , © Lakes help to regulate the flow of rivers., , © Lakes help to prevent flooding during rainy season., , © During the dry season, lakes help to maintain an even flow of water., , @ Lakes can also be used for developing hydel power., , © They moderate the climate of the surroundings and maintain the aquatic ecosystem., , © They enhance natural beauty and help to develop tourism and provide recreation., e.g., Dal Lake and Naini Lake at Nainital.
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© Lakes provide opportunities for fishery development., , Rivers, , © They help to develop hydel power., © They provide water for irrigation, for drinking and other requirements., © They help to develop fisheries., , Q3 Below are given names of a few lakes of India. Group them under two categories natural and created by human beings, , , , , , , , , , , , Q4 Discuss the significant difference between the Himalayan and the Peninsular rivers., , Answer. Difference between the Himalayas and Peninsular rivers are as follows
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Himaiayan Rivers, , flow the throughout the year., , and glaciers., , . Himalayan rivers are perenial and, , They receive water from rainfall, and meiting snow of the mountains, , The Himalayan rivers have long, , 7 eee nas saa, A large number of peninsuler rivers are seasona’, and flow during @ Cerain period in a year., , They receive water from raintall only., , The peninsular river have short and shallow, Courses., , 4. They carry a lot sit and sand. They carry very less or no silt and sand., , 5. These rivers originate from the | They mainly originate in the Wester Ghats., North of the Himalayan mountain, ranges. ,, , 6. Their drainage basins are large. | Their drainage basins are small, , 7. These rivers ignn big defas. Thgy form small deltas., , 8. They are useful for irrigation, | They are seasonal and flow over rocky areas, , cultivation and navigation., , , , | and ere not ust for cutiaation and navigation, , Q5 Compare the east flowing and the west flowing rivers of the Peninsular plateau., , Answer. The difference between east flowing rivers and west flowing rivers are, , , , Ghats and flow eastwards., , , , These rivers flow into the Bay of Bengal., These rivers form deltas at their mouths, , | West Flowing Rivers, , These rivers originate in central indie and, flow westwards., , These rivers flow into the Arabien Sea., These rivers form estuaries at their, mouths., , They carry @ lesser amount of water., Exampies are : Narmada and Tapi., , , , , , Q6 Why are rivers important for the country’s economy?, , Answer. Rives are important for the country’s economy because water from the rivers is a, basic natural resource essential for various human activities. These are, , 1. The rivers provide water for irrigation., , 2. They provide fertility to the soil.
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3. They are useful for navigation, , 4. They help to generate hydro-electricity., , 5. They help to develop tourism., , 6. They provide water for various domestic uses., , 7. They provide livelihood to fishermen., , 8. They help to moderate the climate and environment of nearby areas.
