2. 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.
Answers
I) Give an example. The high mountain or plateaus region where the water of the river flows in two opposite direction. Any elevated area, such as mountain or an upland, separated two drainage basin such an elevation is known as a water divide—for example, Indus and the Ganga river.
2)The major river basin is the Ganga-Brahmaputra-Meghna , which is the largest with catchment area of about 11.0 lakh km2 (more than 43% of the catchment area of all the major rivers in the country). The other major river basins with catchment area more than 1.0 lakh km2 are Indus, Mahanadi, Godavari and Krishna.
3)River Indus originates near lake Mansarowar in Tibet and Ganga originates from Gangotri glacier.
4)They both meet to form the Ganga at Devprayag.
5)Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course? Answer: In Tibet, the river carries a smaller volume of water and less silt, as it is a cold and dry area. ... Hence, the river carries a large volume of water and a considerable amount of silt.
6)River Narmada and Tapi are the two Peninsular rivers which flow through trough
7)Rivers and lakes are of a great value to human beings. They help to develop hydel power, provide water for irrigation, drinking, industries and they help to develop fisheries. They will enhance natural beauty and help in the development of tourism and provide recreation.
Answer:
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