Class 11 Geography: Drainage System — Chapter Question Set

(d) The Damodar — This is the textbook-supported choice for the question.

(c) The Ganga — This is the textbook-supported choice for the question.

(c) The Indus — This is the textbook-supported choice for the question.

(b) The Narmada — This is the textbook-supported choice for the question.

(d) Deva Prayag — This is the textbook-supported choice for the question.

d) drain the excess water — The textbook states: Y ou have observed water flowing through the rivers, nalas and even channels during rainy season which drain the excess water.

c) flooding would have occurred — The textbook states: Had these channels not be en there, large-scale flooding would have occurred.

b) ill-defined or choked — The textbook states: Wherever channels are ill-defined or choked, flooding is a common phenomenon.

a) known as ‘drainage’ and the network of such c — The textbook states: The flow of water through well-defined channels is known as ‘drainage’ and the network of such channels is called a ‘drainage system’.

d) the outcome of the geological time period — The textbook states: The drainage pattern of an area is the outcome of the geological time period, nature and structure of rocks, topography, slope, amount of water flowing and the periodicity of the flow.

c) your village or city? — The textbook states: Do you have a river near your village or city?

b) for boating or bathing? — The textbook states: Have you ever been there for boating or bathing?

a) season, and dry, otherwise)? — The textbook states: Is it perennial (always with water) or ephemeral (water during rainy season, and dry, otherwise)?

d) in the same direction? — The textbook states: Do you know that rivers flow in the same direction?

c) 2024 — The textbook states: You have studied about slopes in the other two textbo oks of geography (NC ERT, 2024) in this class .

b) direction to the other? — The textbook states: Can you, then, explain the reason for water flowing from one direction to the other?

a) Himalayas — The textbook states: Why do the rivers originating from the Himalayas in the northern India and the Western Ghat in the southern India flow towards the east and discharge their waters in the Bay of Bengal?

d) called its ‘catchment area’ — The textbook states: A river drains the water collected from a specific area, which is called its ‘catchment area’.

c) When — The textbook states: (ii) When the rivers originate from a hill and flow in all directions, the drainage pattern is known as ‘radial’.

b) Amarkantak — The textbook states: The rivers originating from the Amarkantak range present a good example of it.

a) When — The textbook states: (iii) When the primary tributaries of rivers flow parallel to each other and secondary tributaries join them at right angles, the pattern is known as ‘trellis’.

d) When — The textbook states: (iv) When the rivers discharge their waters from all directions in a lake or depression, the pattern is know as ‘centripetal’.

c) Practical Work — The textbook states: Find out some of the patterns in the topo she et given in C hapter 5 of Practical Work in Geography– Part I (NCERT).

b) known as the watershed — The textbook states: The boundary line separating one drainage basin from the other is known as the watershed.

a) called river basins while those of small rivu — The textbook states: The catchments of large rivers are called river basins while those of small rivulets and rills are often referred to as watersheds.

d) basin and a watershed — The textbook states: There is, however, a slight difference between a river basin and a watershed.

c) marked by unity — The textbook states: River basins and watersheds are marked by unity.

b) unit as a whole — The textbook states: What happens in one part of the basin or watershed directly affects the other parts and the unit as a whole.

a) why — The textbook states: That is why, they are accepted as the most appropriate micro, meso or macro planning regions.

d) divided on various bases — The textbook states: Indian drainage system may be divided on various bases.

c) Arabian Sea — The textbook states: On the basis of discharge of water (orientations to the sea), it may be grouped into: (i) the Arabian Sea drainage; and (ii) the Bay of Bengal drainage.

b) 77 per cent — The textbook states: Nearly 77 per cent of the drainage area consisting of the Ganga, the Brahmaputra, the Mahanadi, the Krishna, etc.

a) 23 per cent — The textbook states: is oriented towards the Bay of Bengal while 23 per cent comprising the Indus, the Narmada, the Tapi, the Mahi and the Periyar systems discharge their waters in the Arabian Sea.

d) 20,000 — The textbook states: On the basis of the size of the watershed, the drainage basins of India are grouped into three categories: (i) Major river basins with more than 20,000 sq.

c) Ganga — The textbook states: It includes 14 drainage basins such as the Ganga, the Brahmaputra, the Krishna, the Tapi, the Narmada, the Mahi, the Pennar, the Sabarmati, the Barak, etc.

b) 2,000 — The textbook states: (ii) Medium river basins with catchment area between 2,000-20,000 sq.

a) Kalindi — The textbook states: km incorporating 44 river basins such as the Kalindi, the Periyar, the Meghna, etc.

d) 2,000 — The textbook states: ( iii) M inor river basins with catchment area of less than 2,000 sq.

c) area of low rainfall — The textbook states: k m include fairly good number of rivers flowing in the area of low rainfall.

b) Peninsular — The textbook states: Large rivers flowing on the Peninsular plateau have their origin in the Western Ghats and discharge their waters in the Bay of Bengal.

a) Tapi — The textbook states: The Narmada and Tapi are two large rivers which are exceptions.

d) Arabian Sea — The textbook states: They along with many small rivers discharge their waters in the Arabian Sea.

c) Konkan — The textbook states: Name these rivers of the western coastal region from the Konkan to the Malabar coast.

b) Indian — The textbook states: On the basis of the mode of origin, nature and characteristics, the Indian drainage may also be classified into the Himalayan drainage and the Peninsular drainage.

a) Chambal — The textbook states: Although it has the problem of including the Chambal, the Betwa, the Son, etc.

d) Himalayas — The textbook states: which are much older in age and origin than other rivers that have their origin in the Himalayas, it is the most accepted basis of classification.

c) followed in this book — The textbook states: Hence, this scheme has been followed in this book.

b) Indian — The textbook states: DRAINAGE SYSTEMS OF INDIA Indian drainage system consists of a large number of small and big rivers.

a) the outcome of the evolutionary process of th — The textbook states: It is the outcome of the evolutionary process of the three major physiographic units and the nature and characteristics of precipitation.

d) Himalayan — The textbook states: THE HIMALAYAN DRAINAGE The Himalayan drainage system has evolved through a long geological history.

The boundary line separating one drainage basin from the other is known as the watershed. There is, however, a slight difference between a river basin and a watershed. What happens in one part of the basin or watershed directly affects the other parts and the unit as a whole.

The drainage pattern of an area is the outcome of the geological time period, nature and structure of rocks, topography, slope, amount of water flowing and the periodicity of the flow. (ii) When the rivers originate from a hill and flow in all directions, the drainage pattern is known as ‘radial’. (iii) When the primary tributaries of rivers flow parallel to each other and secondary tributaries join them at right angles, the pattern is known as ‘trellis’.

The drainage pattern of an area is the outcome of the geological time period, nature and structure of rocks, topography, slope, amount of water flowing and the periodicity of the flow. (ii) When the rivers originate from a hill and flow in all directions, the drainage pattern is known as ‘radial’. (iv) When the rivers discharge their waters from all directions in a lake or depression, the pattern is know as ‘centripetal’.

The river after Rajamundri splits into several branches forming a large delta. After flowing a distance of about 1,312 km, it meets the Arabian sea south of Bharuch, forming a broad 27 km long estuary.

Y ou have observed water flowing through the rivers, nalas and even channels during rainy season which drain the excess water.

Had these channels not be en there, large-scale flooding would have occurred.

Wherever channels are ill-defined or choked, flooding is a common phenomenon.

The flow of water through well-defined channels is known as ‘drainage’ and the network of such channels is called a ‘drainage system’.

The drainage pattern of an area is the outcome of the geological time period, nature and structure of rocks, topography, slope, amount of water flowing and the periodicity of the flow.

Do you have a river near your village or city?

Have you ever been there for boating or bathing?

Is it perennial (always with water) or ephemeral (water during rainy season, and dry, otherwise)?

Do you know that rivers flow in the same direction?

You have studied about slopes in the other two textbo oks of geography (NC ERT, 2024) in this class .

Can you, then, explain the reason for water flowing from one direction to the other?

Why do the rivers originating from the Himalayas in the northern India and the Western Ghat in the southern India flow towards the east and discharge their waters in the Bay of Bengal?

A river drains the water collected from a specific area, which is called its ‘catchment area’.

(ii) When the rivers originate from a hill and flow in all directions, the drainage pattern is known as ‘radial’.

The rivers originating from the Amarkantak range present a good example of it.

(iii) When the primary tributaries of rivers flow parallel to each other and secondary tributaries join them at right angles, the pattern is known as ‘trellis’.

(iv) When the rivers discharge their waters from all directions in a lake or depression, the pattern is know as ‘centripetal’.

Find out some of the patterns in the topo she et given in C hapter 5 of Practical Work in Geography– Part I (NCERT).

The boundary line separating one drainage basin from the other is known as the watershed.

The catchments of large rivers are called river basins while those of small rivulets and rills are often referred to as watersheds.

There is, however, a slight difference between a river basin and a watershed.

Y ou have observed water flowing through the rivers, nalas and even channels during rainy season which drain the excess water. Why do the rivers originating from the Himalayas in the northern India and the Western Ghat in the southern India flow towards the east and discharge their waters in the Bay of Bengal? DRAINAGE SYSTEMS OF INDIA Indian drainage system consists of a large number of small and big rivers. The Indus also known as the Sindhu, is the westernmost of the Himalayan rivers in India. The Penganga, the Indravati, the 24 INDIA : PHYSICAL ENVIRONMENT The Tapi is the other important westward flowing river. EXTENT OF USABILITY OF RIVER WATER The rivers of India carry huge volumes of water per year but it is unevenly distributed both in time and space. 25DRAINAGE SYSTEM Have you read in the newspapers about the linking of rivers?

On the basis of the size of the watershed, the drainage basins of India are grouped into three categories: (i) Major river basins with more than 20,000 sq. It is opined that in due course of time Indo– Brahma river was dismembered into three main drainage systems: (i) the Indus and its five tributaries in the western part; (ii) the Ganga and its Himalayan tributaries in the central part; and (iii) the stretch of the Brahmaputra in Assam and its Himalayan tributaries in the eastern part. THE RIVER SYSTEMS OF THE HIMALAYAN DRAINAGE The Himalayan drainage consists of several river systems but the following are the major river systems: The Indus System It is one of the largest river basins of the world, covering an area of 11,65,000 sq. The other major river systems of the Peninsular drainage are – the Mahanadi the Godavari, the Krishna and the Kaveri. The Evolution of Peninsular Drainage System Three major geological events in the distant past have shaped the present drainage systems of Peninsular India: (i) Subsidence of the western flank of the Peninsula leading to its submergence below the sea during the early tertiary period. River Systems of the Peninsular Drainage There are a large number of river systems in the Peninsular drainage. A brief account of the major Peninsular river systems is given below: The Mahanadi rises near Sihawa in Raipur district of Chhattisgarh and runs through Odisha to discharge its water into the Bay of Bengal.

Large rivers flowing on the Peninsular plateau have their origin in the Western Ghats and discharge their waters in the Bay of Bengal. On the basis of the mode of origin, nature and characteristics, the Indian drainage may also be classified into the Himalayan drainage and the Peninsular drainage. DRAINAGE SYSTEMS OF INDIA Indian drainage system consists of a large number of small and big rivers. The W estern Ghats running close to the western coast act as the water divide between the major Peninsular rivers, discharging their water in the Bay of Bengal and as small rivulets joining the Arabian Sea. Most of the major Peninsular rivers except Narmada and Tapi flow from west to east. Peninsular rivers are characterised by fixed course, absence of meanders and nonperennial flow of water. Is there sufficient surplus water in the north Indian rivers which can be transferred on a regular basis?

Do you know that rivers flow in the same direction? Can you, then, explain the reason for water flowing from one direction to the other? Why do the rivers originating from the Himalayas in the northern India and the Western Ghat in the southern India flow towards the east and discharge their waters in the Bay of Bengal? (iii) When the primary tributaries of rivers flow parallel to each other and secondary tributaries join them at right angles, the pattern is known as ‘trellis’. They along with many small rivers discharge their waters in the Arabian Sea. Name these rivers of the western coastal region from the Konkan to the Malabar coast. which are much older in age and origin than other rivers that have their origin in the Himalayas, it is the most accepted basis of classification.

Y ou have observed water flowing through the rivers, nalas and even channels during rainy season which drain the excess water. Y ou have observed water flowing through the rivers, nalas and even channels during rainy season which drain the excess water. Had these channels not be en there, large-scale flooding would have occurred. Wherever channels are ill-defined or choked, flooding is a common phenomenon.

Had these channels not be en there, large-scale flooding would have occurred. Y ou have observed water flowing through the rivers, nalas and even channels during rainy season which drain the excess water. Had these channels not be en there, large-scale flooding would have occurred. Wherever channels are ill-defined or choked, flooding is a common phenomenon. The flow of water through well-defined channels is known as ‘drainage’ and the network of such channels is called a ‘drainage system’.

Wherever channels are ill-defined or choked, flooding is a common phenomenon. Had these channels not be en there, large-scale flooding would have occurred. Wherever channels are ill-defined or choked, flooding is a common phenomenon. The flow of water through well-defined channels is known as ‘drainage’ and the network of such channels is called a ‘drainage system’. The drainage pattern of an area is the outcome of the geological time period, nature and structure of rocks, topography, slope, amount of water flowing and the periodicity of the flow.