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 Mansarowar, and the Ganga originates at the Gangotri Glacier. Both of them have their origin in the Himalayas.
(iv) The two headstreams of the Ganga are the Bhagirathi and Alaknanda. They meet at Devaprayag 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
(a) Lakes are of a great value to human beings.
(b) Lakes help to regulate the flow of rivers.
(c) Lakes help to prevent flooding during rainy season.
(d) During the dry season, lakes help to maintain an even flow of water.
(e) Lakes can also be used for developing hydel power.
(f) They moderate the climate of the surroundings and maintain the aquatic eco-system.
(g) They enhance natural beauty and help to develop tourism and provide recreation. e.g., Dal Lake and Naini Lake at Nainital.
(h) Lakes provide oppurtunities for fishery development.
Rivers
(a) They help to develop hydel power.
(b) They provide water for irrigation, for drinking and other requirements.
(c) They help to develop fisheries.
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