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NCERT Solutions for Class 9 Geography Chapter 3 - Drainage

Q1. Choose the right answer from the four alternatives given below.

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

Wular LakeWular Lake(a) Rajasthan
(b) Uttar Pradesh
(c) Punjab
(d) Jammu and Kashmir
Ans:
(d) Jammu and Kashmir state.

Wular lake is the largest freshwater lake in India and is situated in the Bandipora district of Jammu and Kashmir. The lake is surrounded by beautiful mountains and serves as an important habitat for various species of migratory birds.

(ii) The river Narmada has its source at
(a) Satpura
(b) Brahmagiri
(c) Amarkantak
(d) Slopes of the Western Ghats
Ans:
(c) Amarkantak

Amarkantak is a pilgrimage site and a hill station located at the meeting point of the Vindhya and Satpura mountain ranges. Narmada is one of the longest rivers in India, spanning a length of approximately 1,312 kilometers. It is often referred to as the "lifeline of Madhya Pradesh" and is considered sacred by Hindus.

(iii) Which one of the following lakes is a salt water lake?
(a) Sambhar
(b) Dal 
(c) Wular  
(d) Gobind Sagar
Ans:
(a) Sambhar

Sambhar Lake, located in the state of Rajasthan, India, is a saltwater lake. It is the largest inland saltwater lake in India and serves as a major source of salt production in the country. 

(iv) Which one of the following is the longest river of the Peninsular India?
(a) Narmada
(b) Krishna
(c) Godavari
(d) Mahanadi
Ans:
(c) Godavari

The Godavari River originates in the Western Ghats of Maharashtra and flows through the states of Maharashtra, Telangana, Andhra Pradesh, and eventually empties into the Bay of Bengal. The river stretches for about 1,465 kilometers (910 miles) in length, making it the longest river in Peninsular India. 

(v) Which one amongst the following rivers flows through a rift valley?
(a) Mahanadi
(b) Tungabhadra
(c) Krishna
(d) Tapi
Ans:
(d) Tapi

A rift valley is a long, narrow valley that is formed by the sinking and separation of the Earth's crust. The Tapi River originates in the Betul district of Madhya Pradesh and flows through Maharashtra and Gujarat before draining into the Arabian Sea.


Q2. Answer the following questions briefly.

(i) What is meant by a water divide? Give an example.
Ans: A water divide is an elevated area, such as a mountain or an upland, that separates two drainage basins. For example, the water divide between the Indus and the Ganga river system is Ambala.


(ii) Which is the largest river basin in India?
Ans: The Ganga River basin is the largest one in India. The length of this basin is over 2,500 km.


(iii) Where do the rivers Indus and Ganga have their origin?
Ans: 
The Indus originates in Tibet, near Mansarovar Lake. The Ganga River originates at the Gangotri Glacier, Uttarakhand on the southern slopes of the Himalayas.

(iv) Name the two headstreams of the Ganga. Where do they meet to form the Ganga?
Ans: The two headstreams of the Ganga are the Bhagirathi and the Alaknanda. They meet to form the Ganga at Devaprayag in Uttarakhand.


(v) Why does the Brahmaputra in its Tibetan part have less silt, despite a longer course?
Ans: The Brahmaputra in its Tibetan part, carries a smaller volume of water and less silt as it is a cold and dry area. However, as it enters Arunachal Pradesh in India, it receives plenty of rainfall resulting into more water and silt. 


(vi) Which two Peninsular rivers flow through trough?
Ans: The Narmada and the Tapi are the two peninsular rivers that flow through the trough.


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

  • Economic benefits of rivers: Rivers supply water, a basic resource needed for many human activities. People use them for farming, transport, and producing electricity. Rivers also help control the local climate and support life in water.
  • Economic benefits of lakes: Lakes help control the flow of rivers. They prevent floods during heavy rain and keep water flowing steadily during dry seasons. Lakes also help balance the local climate and support aquatic life. Additionally, they add to the natural beauty, promote tourism, and are used to generate hydroelectricity.


Q3. 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
Ans: Natural Lakes
(a) Wular
(b) Dal
(c) Nainital
(d) Bhimtal
(f) Loktak
(g) Barapani
(h) Chilika
(i) Sambhar
(l) Pulicat
Lakes created by human beings
(e) Gobind Sagar
(j) Rana Pratap Sagar
(k) Nizam Sagar
(m) Nagarjuna Sagar
(n) Hirakund

Q4. Discuss the significant difference between the Himalayan and the Peninsular rivers.
Ans: NCERT Solutions for Class 9 Geography Chapter 3 - Drainage

Q5. Compare the east-flowing and the west-flowing rivers of the Peninsular Plateau.
Ans:NCERT Solutions for Class 9 Geography Chapter 3 - Drainage

 

Q6. Why are rivers important for the country’s economy?
Ans: The rivers are important for the country’s economy due to the following reasons:

  • It is an important source of natural freshwater, which is required for the survival of most animals, including humans.
  • River water is used for various purposes like domestic, industrial, and agricultural purposes.
  • The presence of rivers boosts trade and commerce by helping in the easy transport of goods. They are also a potential source of energy.
  • River water is also used to run hydroelectric dams.
  • It is also used for navigation and transport, thus important for commercial activities.
  • It also provides fishing and great scenic and recreational value. Thus, serve as good tourist spots.

Map skills

Q. (i) On the outline map of India mark and label the following rivers: Ganga, Satluj, Damodar, Krishna, Narmada, Tapi, Mahanadi, and the Brahmaputra.
(ii) On an outline map of India mark and label the following lakes: Chilika, Sambhar, Wular, Pulicat, Kolleru 

Ans: 

NCERT Solutions for Class 9 Geography Chapter 3 - Drainage

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FAQs on NCERT Solutions for Class 9 Geography Chapter 3 - Drainage

1. What is the importance of drainage in geography?
Ans.Drainage is important in geography as it refers to the system by which water flows through land and is essential for understanding the water cycle, landforms, and vegetation. It helps in managing water resources, preventing flooding, and supporting agriculture by ensuring proper soil moisture levels.
2. What are the main types of drainage patterns?
Ans.The main types of drainage patterns include dendritic, radial, rectangular, and trellis. Dendritic patterns resemble tree branches and form in regions with uniform rock types. Radial patterns occur around a central peak, rectangular patterns form in areas with faulted or fractured rocks, and trellis patterns develop in areas with alternating resistant and less resistant rocks.
3. How does urbanization affect drainage systems?
Ans.Urbanization significantly affects drainage systems by increasing impervious surfaces like roads and buildings, which leads to greater runoff and reduced infiltration. This can cause urban flooding, overwhelm drainage systems, and lead to water pollution due to increased surface runoff carrying pollutants into water bodies.
4. What role do rivers play in drainage systems?
Ans.Rivers play a crucial role in drainage systems as they act as the main channels for transporting water from higher elevations to lower areas. They collect water from tributaries and surface runoff, shaping the landscape through erosion and sediment deposition, and supporting ecosystems along their banks.
5. What is the significance of watershed management in drainage?
Ans.Watershed management is significant in drainage as it involves the sustainable management of water resources within a watershed to protect water quality and quantity. Effective watershed management helps prevent soil erosion, reduces flooding risks, improves water availability for agriculture, and maintains biodiversity.
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