Short note .[3 Marks Each]

Question 13 Marks

Write short note : Importance of plain

Answer

$(1)$ Fertile plains are favourable for human habitation in many ways, so economic activities like agriculture, trade and industries develop here.
$(2)$ Due to the even surface, roads and railways are more developed here.
$(3)$ Densely populated larger cities have developed in the plains.
$(4)$ Fertile soil is useful for agricultural products. Some of the agro-products provide raw material to some agro-industries.

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Question 23 Marks

Write short note : Depositional Plain

Answer

Depositional plains are formed in two ways :
$(1)$ Alluvial Plains : When a river is flooded, the alluvium brought by the river is deposited on both banks of the river. Thus, alluvial plains are formed. The Ganga - Yamuna plain of India, Huang Ho plain in North China, Lombardy plain formed by Po river in Italy are examples of alluvial plains.
$(2)$ Lacustrine Plains : Some rivers meet lakes. These rivers deposit their the sediments, soil, sand, etc. in the lakes. So the lake is gradually filled and in due course of time a plain is formed which is called Lacustrine Plain. The Kashmir valley and Imphal region of Manipur state in India have Lacustrine plains. [When the river meets the sea, it deposits abundant alluvium near the coastal area due to its slow flow. The plain thus formed is called ‘Delta Plain.’ When the wind deposits the soil and sand particles brought with it are obstructed or if the velocity of the wind reduces, a depositional plain is formed. It is called ‘Loess Plain’.

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Question 33 Marks

Write short note : Importance of plateaus

Answer

The importance of a plateau is as follows :
$(1)$ Cotton grows best in the plateau formed by the fertile black lava soil.
$(2)$ Precious minerals like iron, manganese, gold, etc. are obtained from the ancient solid rocks of the plateaus. e.g., many precious minerals are obtained from Chhota Nagpur plateau of India.
$(3)$ Sloppy grasslands of the plateau are suitable for cattle rearing.
$(4)$ Some plateaus are very favourable for Tourism and Film industries.

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Question 43 Marks

Write short note : Block Mountain

Answer

Due to diastrophism, the tensional forces are created and faults develop in the rock strata. The area in between two faults is raised or the central part remains stable and surrounding areas are submerged, so the remnant high land is called 'Block Mountain'.The Horst mountain of Germany is considered to be its best example. So this type of mountain is called 'Horst Mountain'. Nilgiri, Satpuda, Vindhya, etc. of India are block mountains.
The height of block mountains is less than fold mountains. These are spread over a limited area on the Earth.

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Question 53 Marks

Write short note : Importance of mountains

Answer

The importance of mountains is as follows:
$(1)$ The high lofty mountains on the border serve as a natural wall for the defence of the border.
$(2)$ There is a noticeable effect of the location of the mountains on climate. e.g., The Himalayas obstruct the cold chilling winds coming from north during winter and protect North India from severe cold.
$(3 )$ Mountains obstruct the moisture-bearing winds and bring rains.
$(4 )$ Many rivers have their origin in mountains. Rivers form fertile plains.
$(5 )$ The perennial rivers flowing from the snow-clad high mountains getting heavy rainfall are useful for irrigation, hydro-electricity, fisheries and navigation.
$(6 )$ Many minerals are obtained from some mountains.
$(7 )$ Mountains are the repository of vegetation and animals.
$(8 )$ Some places situated on the mountains at a height are useful as hill stations.
$(9 )$ Mountains are a blessing to the Tourism industry, the film industry and to mountaineers.
$(10)$ Mountains are the places of dwelling for one-tenth population of the world.

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Question 63 Marks

Answer the following questioras as directed: Explain the importance of mountains.

Answer

The importance of mountains is as follows:
$(1)$ The high lofty mountains on the border serve as a natural wall for the defence of the border.
$(2)$ There is a noticeable effect of the location of the mountains on climate. e.g., The Himalayas obstruct the cold chilling winds coming from north during winter and protect North India from severe cold.
$(3 )$ Mountains obstruct the moisture-bearing winds and bring rains.
$(4 )$ Many rivers have their origin in mountains. Rivers form fertile plains.
$(5 )$ The perennial rivers flowing from the snow-clad high mountains getting heavy rainfall are useful for irrigation, hydro-electricity, fisheries and navigation.
$(6 )$ Many minerals are obtained from some mountains.
$(7 )$ Mountains are the repository of vegetation and animals.
$(8 )$ Some places situated on the mountains at a height are useful as hill stations.
$(9 )$ Mountains are a blessing to the Tourism industry, the film industry and to mountaineers.
$(10)$ Mountains are the places of dwelling for one-tenth population of the world.

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Question 73 Marks

Write short note: State the importance of the plains.

Answer

$(1)$ Fertile plains are favourable for human habitation in many ways, so economic activities like agriculture, trade and industries develop here.
$(2 )$ Due to the even surface, roads and railways are more developed here.
$(3 )$ Densely populated larger cities have developed in the plains.
$(4 )$ Fertile soil is useful for agricultural products. Some of the agro-products provide raw material to some agro-industries.

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Question 83 Marks

Write short note: State the importance of plateaus.

Answer

The importance of a plateau is as follows:
$(1)$ Cotton grows best in the plateau formed by the fertile black lava soil.
$(2 )$ Precious minerals like iron, manganese, gold, etc. are obtained from the ancient solid rocks of the plateaus. e.g., many precious minerals are obtained from Chhota Nagpur plateau of India.
$(3 )$ Sloppy grasslands of the plateau are suitable for cattle rearing.
$(4 )$ Some plateaus are very favourable for Tourism and Film industries.

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Social Science Short note .[3 Marks Each]

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