Extra Questions for Class 9th: Ch 3 Drainage Social Studies (S.St) Important Questions Answer Included

Very Short Answer Questions (VSAQs): 

1. Which word denotes a river system of an area?



2. Which river is known as the ‘Dakshin Ganga’?


The Godavari

3. Which is the second longest river of Peninsular India?



4. Which place is located on the water divide between the Indus and the Ganga river system ?



5. Which type of drainage pattern is made by Narmada River?


Trellis drainage pattern

6. Zaskar and Nubra are important tributaries of which river?


Indus river.

7. At which place do the Satluj, Beas, Ravi, Chenab and the Jhelum rivers goin together with Indus ?



8. Yamuna, Ghaghara and Kizi are important tributaries of which river?



9. According to Indus Water Treaty (1960), India can use how much percentage of total water carried by Indus?


20% of total water carried by Indus.

10. In which of the following states is Sambhar Lake situated?



Short Answer Questions (SAQs):

1. Explain the term ’water divide’ with example. What is its significance? 


Any elevated area such as a mountain or an upland that separates two drainage basins is known as water divide. The Western Ghats is a water divide of peninsular rivers. 
It helps us identify two different drainage patterns.

2. What are perennial and non-perennial rivers? Give reasons why the Himalayan region consists of perennial rivers.


The rivers that flow throughout the year are termed as perennial rivers. They have more or less even flow throughout the year. Example: the Ganga.
The rivers that do not flow throughout the year are termed as non-perennial rivers. They are seasonal rivers that flow mainly during the rainy season and dwindle during the dry period. Example: the Subarnarekha.
The rivers of the Himalayan region are perennial in nature. They have their sources in the snow fields and glaciers of the Himalayas which supply water to these rivers throughout the year.

3. What is a river pattern? Name any four patterns formed by the river. 


The stream within a drainage basin form certain patterns depending on the slope of land, underlying rock structure as well as the climatic conditions of the area. Four patterns formed by rivers are: 
(i) Dendritic pattern 
(ii) Trellis pattern 
(iii) Radial pattern 
(iv) Rectangular pattern.

4. Name the three Himalayan river system. Give two tributaries of each.


Three Himalayan river systems are: 
(i) The Indus river system 
(ii) The Ganga river system
(iii) The Brahamaputra river system.

(i) Indus river system – Satluj, Beas, Ravi 
(ii) Ganga river system – Yamuna, Ghaghara, Gandak 
(iii) Brahmaputra river system – Dibang, Lohit, Kenula.

5. Define a river system and describe two characteristics of river Indus. 


A river along with its tributaries is called a river system. 
(i) River Indus rises in Tibet near Mansarovar Lake. 
(ii) Its total length is 2,900 km and is one of the longest rivers of the world. 
(iii) Majority of it flows through Pakistan and assists in agricultural activities.

6. Describe any three features of the Himalayan Rivers.


(i) These are perennial.
(ii) Have long courses from their source to the sea.
(iii) These rivers perform intensive erosion activity in their upper course and carry huge load of silt and sand.

7. Describe any three important features of the Ganga river system.


(i) Headwaters of the Ganga (called Bhagirathi) is born from Gangotri Glacier and is joined by Alakananda at Devprayag.
(ii) The Ganga is joined by a large number of tributaries from east and west.
(iii) It drains into the Bay of Bengal after joining the Brahmaputra and through its distributaries.

8. How do the Himalayan rivers perform erosional activities and form depositional features?


(i) In the upper course, rivers flow with great speed from higher to lower levels. They cause erosion.
(ii) In the middle and the lower course, they carry lots of sediment like silt and sand. So, the speed slows down.
(iii) Besides, absence of slope in the lower course causes deposition and formation of various features.

9. What is a lake? How are lakes formed? 


A lake is an area of water surrounded by land on all sides.
(i) There are lakes which are formed as a result of action of glaciers and ice sheets, while the
others have been formed by wind, river action, and human activities.
(ii) Some lakes are formed as a result of the tectonic activity. For example, Wular Lake in
Jammu and Kashmir.
(iii) The damming of rivers for the generation of hydel power has also led to the formation of

10. Differentiate between the Ganga and the Godavari river system.


Ganga River System:
• It is a Himalayan river.
• The ganga emerges from the mountains onto the plains from Haridwar.
• The length of Ganga is over 2500 km.
Godavari river system:
• It is a peninsular river.
• It rises from the slopes of the Western Ghats in Nasik district of Maharashtra.
• The length of Godavari is 1500 km.

Long Answer Questions (LAQs):

1. Define water divide. What are the different patterns of flow made by a river?


An elevated area such as a mountain or an upland that separates two drainage basins is called water divide. The four drainage patterns are as follows:
(i) Dendritic: The dendritic pattern develops where the river channels follow the slope of the terrain. The stream with its tributaries resembles the branches of a tree, thus the name dendritic.
(ii) Trellis: A river joined by its tributaries, at approximately right angles, develops a trellis pattern. A trellis drainage pattern develops where hard and soft rocks exist parallel to each other.
(iii) Rectangular: A rectangular drainage pattern develops on a strongly-jointed rocky terrain.
(iv) Radial: The radial pattern develops when streams flow in different directions from a central peak or dome-like structure.

2. What are the differences between the Himalayan rivers and the Peninsular rivers?


The Himalayan Rivers:
• The Himalayan rivers are perennial in nature as they are fed by the melting snow and glaciers of the lofty ranges supplemented by monsoon rains.
• The Himalayan rivers have long course from their sources in the mountains to the sea.
• The Himalayan rivers rise in the Himadri, Himachal or Shivalik section of the Himalayas and form the Northern Plains with their deposition of alluvium.
• The Himalayan rivers flow through geologically unstable areas.
• They perform intensive erosional activity in upper course. In middle and lower course they form meanders, oxbow lakes, extensive floodplains and well-developed deltas.

The Peninsular Rivers:
• The Peninsular rivers are non-perennial in nature as they are fed by monsoon rains and have heavy flow during rainy season followed by reduced flow during dry season.
•The Peninsular rivers have shorter and shallower courses.
• Most of the rivers of Peninsular India originate in the Western Ghats and flow towards the Bay of Bengal. 
• Peninsular rivers originate at much lower altitudes and flow through geologically stable areas.
• The Narmada and Tapi are fault-guided rivers. The east-flowing rivers from large deltas. Meanders are not notable in these rivers.

NCERT Solutions of Chapter 3 Drainage

Notes of Chapter 3 Drainage

MCQ Test of Chapter 3 Drainage

Previous Post Next Post