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Answer the following questions briefly.
Question (i)
What is meant by a water divide? Give an example.
Answer:
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Answer to be written in exam
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Any elevated area, such as a mountain or upland that separates two drainage basins i s known as a
Water Divide.
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For example:
- Ambala is located on the water divide between the Indus and the Ganga river systems.
- The Western Ghats act as the water divide of the Peninsular rivers .
Question (ii)
Which is the largest river basin in India?
Answer:
Answer to be written in exam
The Ganga basin is the largest drainage basin in India.
Question (iii)
Where do the rivers Indus and Ganga have their origin?
Answer:
Points to Remember
- Indus - originates in Tibet, near Lake Mansarovar.
- Ganga - fed by the Gangotri Glacier
Answer to be written in exam
The Indus River originates in Tibet , near Lake Mansarovar and it passes through Baltistan and Gilgit before emerging from the mountains at Attock.
The Ganga's headwaters, known as the ' Bhagirathi, ' are fed by the Gangotri Glacier and join the Alaknanda at Devaprayag in Uttarakhand and it emerges from the mountains onto the plains at Haridwar.
Question (iv)
Name the two headstreams of the Ganga. Where do they meet to form the Ganga?
Answer:
Answer to be written in exam
- The two headstreams of the Ganga river are Bhagirathi and Alaknanda.
- They meet at Devaprayag in Uttarakhand to form the Ganga
Question (v)
Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?
Answer:
Answer to be written in the exam
- The climatic condition of Tibet is cold and dry , so here the Brahmaputra river carries a smaller volume of water and less silt.
- On the other hand, In India, the Brahmaputra river passes through a region that receives higher rainfall . So, here the river carries a large volume of water and a considerable amount of silt.
Question (vi)
Which two Peninsular rivers flow through a trough?
Answer:
Answer to be written in the exam
Narmada and Tapi are the peninsular rivers that flow through troughs.
Question (vii)
State some economic benefits of rivers and lakes.
Answer:
Points to Remember
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Economic Benefit of River
- Beneficial for the agricultural purposes
- Used to generate hydro electricity.
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Economic Benefit of Lake
- Used to generate hydroelectric power.
- Promote tourism , and provide recreational opportunities.
- Used for producing salt.
Answer to be written in exam
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Economic Benefit of River
- Rivers are beneficial for the agricultural purposes especially for irrigation
- It also used to generate hydro electricity.
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Economic Benefit of Lake
- It is also be used to generate hydroelectric power.
- It promote tourism , and provide recreational opportunities.
- Some lakes such as Sambhar lakes’ water is used for producing salt.
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