NCERT Solutions For Class 9 Geography Chapter 3 Drainage

NCERT Solutions For Class 9 Geography Chapter 3 Drainage:- In Class 9 Geography, Chapter 3, "Drainage," focuses on how rivers and other water bodies shape our landscape and support ecosystems. The chapter covers the concept of drainage systems and explains how rivers, lakes, and their tributaries form complex networks that impact the geography and climate of different regions.

 Students will learn about various drainage patterns, such as dendritic, radial, and trellis, and understand the natural processes that create and sustain these patterns. The NCERT Solutions for this chapter offer clear answers and explanations, helping students grasp the key concepts and improve their understanding of how drainage systems work. Check out the drainage class 9 notes below.

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Class 9 Geography Chapter 3 Questions and Answers

1. Choose the right answer from the four alternatives given below.

(i) In which of the following states is the Wular lake located?

(a) Rajasthan (b) Punjab (c) Uttar Pradesh (d) Jammu and Kashmir

Answer: Jammu and Kashmir

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(ii) The river Narmada has its source at

(a) Satpura (b) Amarkantak (c) Brahmagiri (d) Slopes of the Western Ghat

Answer: Amarkantak

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(iii) Which one of the following lakes is a saltwater lake?

(a) Sambhar (b) Wular (c) Dal (d) Gobind Sagar

Answer: Sambhar

(iv) Which one of the following is the longest river in Peninsular India?

(a) Narmada (b) Godavari (c) Krishna (d) Mahanadi

Answer: Godavari

(v) Which one amongst the following rivers flows through a rift valley?

(a) Mahanadi (b) Krishna (c) Tungabhadra (d) Tapi

Answer: Tapi

2. Answer the following questions briefly.

(i) What is meant by a water divide? Give an example.

Answer: An elevated region, such as a mountain or upland, that separates two drainage basins is known as a water divide. This upland acts as a boundary that directs water flow into different river systems. An example of a water divide is the one between the Indus and Ganga River systems.

(ii) Which is the largest river basin in India?

Answer: The Ganga River Basin is the largest river basin in India.

(iii) Where do the rivers Indus and Ganga have their origin?

Answer: Indus River origin – Near Manasarovar Lake, Tibet

Ganga River origin – Gangotri glacier in Uttaranchal

(iv) Name the two headstreams of the Ganga. Where do they meet to form the Ganga?

Answer: The two headstreams of the Ganga are Alaknanda and Bhagirathi. 

(v) Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?

Answer: In Tibet, the river has a lower volume of water and less silt due to the cold and dry climate. However, when the river flows into India, it passes through areas with high rainfall, resulting in a significantly larger volume of water and a greater amount of silt.

(vi) Which two Peninsular rivers flow through a trough?

Answer: Narmada and Tapi are the two Peninsular rivers that flow through a trough.

(vii) State some economic benefits of rivers and lakes.

Answer: Rivers have always been crucial throughout human history, serving as a vital natural resource for countless activities. Their water is essential for many aspects of daily life, which is why riverbanks have been favored locations for settlements since ancient times. In countries like India, where agriculture is the primary livelihood for most people, rivers are particularly important for irrigation, transportation, and hydropower generation.

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3. Below are given names of a few lakes of India. Group them under two categories – natural and created by human beings. (a) Wular (b) Dal (c) Nainital (d) Bhimtal (e) Gobind Sagar (f) Loktak (g) Barapani (h) Chilika (i) Sambhar (j) Rana Pratap Sagar (k) Nizam Sagar (l) Pulicat (m) Nagarjuna Sagar (n) Hirakund

Answer: Natural Lakes

• Wular

• Dal

• Nainital

• Bhimtal

• Loktal

• Chilika

• Pulicat

• Sambhar

• Barapani

Human-made Lakes

• Gobind Sagar

• Rana Pratap Sagar

• Nizam Sagar

• Nagarjuan Sagar

• Hirakud

4. Discuss the significant difference between the Himalayan and the Peninsular rivers.

Answer: Himalayan Rivers

• These are perennial rivers.

• Receive water from Rain and Snowfall.

Peninsular Rivers

• These are seasonal rivers.

• Dependent on rainfall. During dry seasons, the rivers get dried up.

5. Compare the east-flowing and the west-flowing rivers of the Peninsular plateau.

Answer: West flowing rivers

• There are only 2 long West flowing rivers – Narmada and Tapi.

• They flow into the Arabian Sea.

• They have a lesser number of tributaries.

• Form estuaries.

• Carry lesser sediments.

East flowing rivers:

• Many major rivers, Mahanadi, Cauvery, Godavari, Krishna, etc.

• They flow into the Bay of Bengal.

• Have many tributaries.

• Forms Deltas.

• Carry larger sediments than West flowing rivers.

6. Why are rivers important for the country’s economy?

Answer: Rivers have played a crucial role throughout human history, providing a vital natural resource for numerous activities. The water from rivers has always been essential for daily life, leading early settlers to establish communities along their banks. Over time, these early settlements have grown into large cities. Rivers are particularly important for irrigation, transportation, and generating hydropower, especially in a country like India, where agriculture is the primary livelihood for most of the population.

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Drainage Class 9 Summary 

Chapter 3 of Class 9 Geography, titled "Drainage," examines how water bodies like rivers and lakes shape the Earth's surface and support ecosystems. The chapter introduces the concept of drainage systems, which are networks of rivers, streams, and their tributaries that drain a particular area.

1. Drainage Basins: These are areas where all the water drains into a single river system. Each basin has a main river and its tributaries.

2. Types of Drainage Patterns: Different patterns include:

• Dendritic: Resembles a tree's branches, common in regions with uniform rock types.

• Radial: Water flows outward from a central point, typical of volcanic regions.

• Trellis: Features a network of parallel streams, found in areas with alternating hard and soft rock layers.

• Major River Systems in India: The chapter covers important rivers like the Ganges, Yamuna, and Brahmaputra, and their significance to the regions they flow through.

3. Waterfalls and River Erosion: The chapter discusses how rivers erode land over time, creating features like waterfalls and valleys.

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Class 9 Geography Chapter 3 FAQs

Q1. What is a drainage basin?

Ans. A drainage basin is an area where all the water from rain or melting snow flows into a single river or stream. It includes the main river and all its tributaries.

Q2. What are the main types of drainage patterns?

Ans. The main types of drainage patterns are dendritic (tree-like), radial (flowing outward from a central point), and trellis (parallel streams meeting at right angles).

Q3. How does a dendritic drainage pattern form?

Ans. A dendritic pattern forms in regions with uniform rock types where the river system develops in a branching, tree-like manner.

Q4. What is the significance of the Ganges River in India?

Ans. The Ganges River is crucial for its religious importance, as well as for its role in agriculture and providing water resources to millions of people.

Q5. What are the major river systems in India?

Ans. Major river systems in India include the Ganges, Yamuna, Brahmaputra, Indus, and Godavari rivers.