Chhattisgarh State Board Class 9 Social Science Chapter 4 The Rivers of India and their Drainage System Exercise Multiple Choice, Fill in the Blanks, Questions and Answers here.
Chhattisgarh State Class 9 Social Science Chapter 4 The Rivers of India and their Drainage System Solution
- Activity: Look at Map 4.1, which shows India’s drainage system. Identify the drainage basin of the four rivers given in the table below.
Ans: – Narmada: Drainage Basin – Arabian Sea
– Tapti: Drainage Basin – Arabian Sea
– Mahanadi: Drainage Basin – Bay of Bengal
– Godavari: Drainage Basin – Bay of Bengal
- Look at the physical map of Chhattisgarh and answer the following: 1. The place of origin of the Mahanadi 2. The northern and southern tributaries of the Mahanadi 3. Prominent places in Chhattisgarh located on the Mahanadi
Ans: 1.) The place of origin of the Mahanadi in Chhattisgarh is the Sihawa village in Dhamtari district.
2.) The northern tributaries of the Mahanadi include the Seonath, Jonk, Hasdeo, Mand, and Ib rivers. The southern tributaries include the Ong, Tel, Tandula, and Shivnath rivers.
3.) Prominent places in Chhattisgarh located on the Mahanadi include Raipur, Dhamtari, Sihawa, and Devri.
EXERCISE
1.) Which drainage pattern is depicted in the diagram alongside?
- a) dendritic c) trellis b) rectangular d) centripetal
Ans: a) dendritic
2.) The Brahmaputra basin spreads across 1) India and China, 2) India and Pakistan and 3) Bangladesh
- a) Only 1 is correctb) 1 and 3 are correct d) Only 2 is correct c) 1 and 2 are correct
Ans: c) 1 and 2 are correct
3.) Which river forms the Sundarban delta?
- a) Godavari c) Kaveri b) 1 and 3 are correct d) Only 2 is correct b) Ganga d) Indus
Ans: b) Ganga
4.) Hirakund is India’s longest dam. On which river is it located? a) Ganga b) Godavari c) Narmada d) Mahanadi
Ans: d) Mahanadi
5.) Explain what is meant by drainage and drainage system.
Ans: Drainage is the flow of water into a river from the surrounding area. It depends on the gradient (slope) of the land and the surface features (topography) of that area.The entire area from which the water drains into a river is called the river basin. The main river and its tributaries together form a system which is called the drainage system.The small streams, tributaries and the main river form a pattern in the drainage basin. The pattern depends on the topography of the river basin so it is specific for each river
6.) Describe the features of the upper course of a river.
Ans: : When the river emerges from its source in the mountains, it flows very swiftly. This fast-flowing stream cuts a narrow channel in the mountain. The erosion is less along the river banks and more in the river bed. As a result, the river forms a ‘v’-shaped valley. The valley is steep and narrow. The river carriest along pebbles, stones and large pieces of rock in its swift curren.
7.) What are the differences between the Ganga and the Godavari basins?
Ans: The Ganga Basin: The Ganga and its tributaries form a vast plain in the northern part of India. This Gangetic plain is very fertile. The rivers in the basin flood every year and deposit a layer of alluvial soil that is rich in humus. The land is intensively cultivated. Several multi-purpose dams have been constructed on these rivers. They provide irrigation and electricity and support the development of industries like fishery, tourism etc. The flat topography of the Gangetic plain facilitates the expansion of different modes of transport and the growth of industries. It is the most densely populated region of India.
Whereas,
The Godavari Basin: This basin is created by the Godavari and its tributaries Banganga, Manjira, Penganga etc. The basin is narrow is some parts and wide in others. The Godavari passes through Kandara near the Eastern Ghats at Pollavaram in Andhra Pradesh. After this, the river widens. It deposits the silt in the lower regions when it floods. Cotton and other commercial crops are grown extensively in the region’s black cotton soil.
8.) What problems would you face if you live in the Sundarbans? How would you resolve these problems?
Ans: Living in the Sundarbans would probably provide several difficulties. Onerous cyclones that occur every year, restricted access to drinkable water, the risk of running into tigers when fishing, and the difficulties of maintaining agriculture owing to brackish groundwater are just a few of the issues. In addition, the expansion of the human population into forest regions is resulting in environmental damage and the loss of animal habitat. The loss of Sundari trees is creating a decrease in the amount of vegetation, and the absence of elephant grass is bringing tigers closer to populated areas. The likelihood of confrontations between humans and tigers has increased as a result of overzealous local hunting.
Inhabitants of the Sundarbans should take action to solve these issues by strengthening and cyclone-resistant building construction, enhancing water management practises to provide a more dependable water supply, and supporting sustainable practises that lessen conflicts between humans and animals. The protection of tigers’ and other animals’ natural habitats, the planting of indigenous plants, and spreading knowledge of ethical hunting techniques might all be the focus of conservation initiatives. Additionally, community-based projects, government actions, and international collaboration might be very helpful in easing the difficulties the Sundarbans residents are facing.
9.) Explain what is meant by groundwater: is the water table falling? If yes, then why?
Ans: Water that is found in the pores and cracks of rocks and soil under the surface of the Earth is referred to as groundwater.
Over the last few decades, groundwater has become the chief source for irrigation. It is difficult to curb excessive use of water, because people do not treat it as a common resource. Ground water is treated as private poperty and exploited ruthlessly. But the truth is that water doesn’t collect under the surface of any individual’s field. It flows below the surface. So if one person uses water excessively, other people are deprived and don’t get enough water. This leads to a situation where people have to bore deeper and deeper to get water for irrigation. This over-exploitation of water is causing tubewells to dry up and is lowering the water table (level of ground water).
10.) How did the Hivre Bazar people resolve their water-scarcity problems?
Ans: Check dams were built to store water for agriculture. Percolation tanks and loose boulder structures were also constructed. Trees were planted on both sides of the village roads and tree plantation was also done in the forests. A total ban on tree felling and open grazing was declared. Also banned was the use of bore wells and cultivation of banana and sugarcane. The bans were strictly enforced by common consent.
As a result of these efforts, the Hivre Bazar people resolved their water-scarcity problems.