WBBSE Class 7 Geography Solutions Chapter 4 Landforms

Detailed explanations in West Bengal Board Class 7 Geography Book Solutions Chapter 4 Landforms offer valuable context and analysis.

WBBSE Class 7 Geography Chapter 4 Question Answer – Landforms

Match the following (Page no. 40) 

1. Etna	Fold Mountain
2. Alps	Igneous Mountain
3. Black Forest	Fold Mountain Forest
4. Himalaya	Black Mountain

Answer:

1. Etna	Igneous Mountain
2. Alps	Fold Mountain
3. Black Forest	Black Mountain
4. Himalaya	Fold Mountain

Brainware-Solve it if you grasp it. (Page no. 42)

Answer:
Mountain

1. Height-More than 900 m
2. Charecteristics-For extended rocky mass with steep slope.
3. Charecteristics-Conical narrow upper portion known as peak.
4. Types-Fold Mountain, volcanic Mountain, Black Mountain.

Plateau

1. Height-300-600 m
2. Highest plateau-Pamir plateau
3. Charecteristics-Land with steep slope at its side with plat or undulating top.
4. Example : Pamir plateau, Tibetian plateau, Indian Chotanagpur plateau.

Plain :

1. Charecteristcs-Almost Flat land.
2. Type-Alluvial plain, Lava plain, Loess plain.
3. Example : Ganga-Brahmaputra plain, Loess plain of China, Hwong-Ho plain.

Effect of of Landforms on Human life- (Page no. 45)

a) Mountain Region :

Question 1.
What can be the main livelihood?
Answer:
Animal Husbandary, Lumbering Industry, Tourism.

Question 2.
What should be the transport system?
Answer:
Bad.

Question 3.
How are settlement and density of population likely to be?
Answer:
Low

Question 4.
How is the economic development likely to be?
Answer:
Low.

Question 5.
Lifestyle?
Answer:
Very Tough.

B. Plateau Region :

Question 1.
What can be the main livelihood?
Answer:
Industry and mining.

Question 2.
What should be the transport system?
Answer:
Medium.

Question 3.
How are settlement and density of population likely to be?
Answer:
Medium.

Question 4.
How is the economic development likely to be?
Answer:
Medium

Question 5.
Lifestyle?
Answer:
Very Tough

C. Plain Region :

Question 1.
What can be the main livelihood?
Answer:
Agriculture, Entertainment Industry, Animal husbandry.

Question 2.
What should be the transport system?
Answer:
Very good.

Question 3.
How are settlement and density of population likely to be?
Answer:
Very high.

Question 4.
How is the economic development likely to be?
Answer:
High.

Question 5.
Lifestyle?
Answer:
Medium.

Crossword :

Across
1. Landforms exceeding1000 m in height.
6. A famous hill station in South India.
7. A volcano in Sicily.

Up-Down
2. Fold Mountain in North America.
3. Block mountain in India.
4. Intermontane plateau between Himalayas and Kunlun.
5. Darjeeling is a famous spot

Class 7 Geography Chapter 4 Question Answer West Bengal Board – Landforms

Multiple Choice Questions & Answers : (1 mark for each question)

Question 1.
An endogentic force is –
i) sea waves
ii) radiation from the sun
iii) earth movement
Answer:
iii) earth movement

Question 2.
An old fold meantain of India is –
i) himalay
ii) Araballi
iii) Satpura
Answer:
ii) Araballi

Question 3.
According to the mode of origin mountains are of –
i) two types
ii) four types
iii) five types
iv) three types
Answer:
iv) three types

Question 4.
The hight of Mt. Everest is –
i) 8840 m
ii) 8844 m
iii) 8848 m
iv) 4488 m
Answer:
iii) 8848 m

Question 5.
Fold is responsible for formation of –
i) block mountain
ii) fold mountain
iii) volcanic mountain
Answer:
i) block mountain

Question 6.
The largest plateau of the world is –
i) Colorado plateau
ii) Anatolian Plateau
iii) Tibetan Plateau
iv) Decan plateau
Answer:
iii) Tibet Plateau.

Question 7.
River based civilizations are formed at –
i) mountain region
ii) plateau region
iii) plain region
Answer:
iii) Plain region

Question 8.
Decan plateau is best example of –
i) lava
ii) continental
iii) piedmont
iv) intermontane
Answer:
i) lava.

Question 9.
Generally a plateau is –
i) 250 m high
ii) above300 m high
iii) below300 m high
iii)200 m high
Answer:
ii) above300 m high

Question 10.
Many mountain ranges converging at a place forms a –
i) peak
ii) valley
iii) mountain range
iv) mountain knot
Answer:
iv) mountain knot

Question 11.
Visuvius is situated in-
i) Africa
ii) Japan
iii) Italy
iv) Indonesia
Answer:
iii) Italy

Question 12.
Mountains are generally higher than –
i) 300 m
ii) 900 m
iii) 600 m
iv) 700 m
Answer:
ii) 900 m

Question 13.
A famous plain land of Asia-
i) Gangetic Plains
ii) Pampas
iii) Prairries
iii) plains of Nile
Answer:
i) Gangetic Plains

Question 14.
Satpura in India is a-
i) Volcanic mountain
ii) Fold mountain
iii) Block mountain
Answer:
iii) Block mountain

Question 15.
Most plateaus are very rich in –
i) agriculture
ii) industry
iii) tourism
iv) minerals

Question 16.
Pampas is situated in –
i) North America
ii) South America
iii) Africa
iv) Asia
Answer:
ii) South America

Question 17.
A contintinental plateau-
i) Greenland
ii) Malwa
iii) Chhotanagpur
iv) Tibet
Answer:
i) Greenland

Fill in the blanks : (1 mark for each question)

1. The diversity of earth’s surface is called ________.
Answer:
Landfrom

2. Glacier is the Earth’s ________.
Answer:
exogentic

3. The highest peak of the world is ________.
Answer:
Mt. Everest

4. Lowland between two high ridges is called ________.
Answer:
vally.

5. The plateau is called ________.
Answer:
table land.

6. A plain of south America is ________.
Answer:
Pompus.

7. The Chhotanagpur plateau is a ________.
Answer:
dissected Plateau.

8. The forest of ________ wood is found in mountain region.
Answer:
soft.

9. ________ plateau is best example of Volcanic Plateau.
Answer:
Decan.

10. ________ is North America one the world’s largest alluvial plain.
Answer:
Prairie

11. The world’s highest inter moutain plateau is situated in between Himalaya and ________ mountain.
Answer:
Kuniti:.

12. When Mountain peaks and valleys extended laterrally is called Mountain ________.
Answer:
chain.

13. When a few mountain chains meet in a highland is called Mountain ________.
Answer:
knot.

14. The top of a plateau may be flat or ________.
Answer:
undulating.

15. Forces from the earth’s ________ as well as those from outside can shape various types of plains.
Answer:
interior.

State whether True or False : (1 mark for each question)

1. Lava plains can be seen in iceland.
Answer:
true

2. A plateau is also called a table land.
Answer:
true

3. The hight of pamir plateau is 3973 m.
Answer:
false

4. Nile in North America is a famous plain.
Answer:
false

5. About one-fourth of the landmass on earth is mountain.
Answer:
true

6. Vesuvias in Italy is a volcanic mountain.
Answer:
true

7. Vosges in Italy is a voicanic mountain.
Answer:
false

8. Alps in Europe is a fold mountain.
Answer:
true

9. The surface of the earth is not similar everywhere.
Answer:
true

10. The highest parts of the earth’s surface are plains.
Answer:
false

11. The interior of the earth always undergoes movements.
Answer:
true

12. Rivers, winds, glaciers and sea waves are sndogenic process.
Answer:
false

13. The narrow, pointed summits of the mountains are salled peaks.
Answer:
true

14. Most of the plains in the world have been formed by the deposition of alluvium.
Answer:
true

Match the column A with column B.

Column A	Column B
a) Prairries in North America—	i) an alluvial plains
b) The Tibet plateau is	ii) a table land
c) The Chhotanagpur plateau is	iii) mountainous tourist spot
d) Pamir plateau is known as	iv) one of the famous plains of the world
e) Indo-Ganga-Brahmaputra plains is	v) $3655 \mathrm{~m}$ high
f) Antertica is a	vi) lava plateau
g) P’ateau is also called	vii) a dissected plateau
h) Decan plateau is a	viii) grow in the mountains
i) Darjeeling is a famous	ix) ‘Roof of the world’
j) Forests of valuable soft wood trees	x) continental plateau

Answer:
a) Prairries in North America-one of the famous plains of the world.
b) The Tibet plateau is3655 m high.
c) The Chhotanagpur plateau is a dissected plateau.
d) Pamir plateau is known as ‘Roof of the world’.
e) Indo-Ganga-Brahmaputra plains is an alluvial plains.
f) Antertica is a continental plateau.
g) Plateau is also called a table land.
h) Decan plateau is a lava plateau.
i) Darjeeling is a famous mountainous tourist spot.
j) Forests of valuable soft wood trees grow in the mountains.

Very Short Questions & Answers : (1 mark for each question)

Question 1.
What is landform?
Answer:
The diversity of land is called landform.

Question 2.
What are the different forces that are responsib ce for creation of landform.
Answer:
The two different forces that are responsible for creation of landform are endogentic foree and exogenatic force.

Question 3.
What is the heighest plateau of the world?
Answer:
The heighest plateau of the world is Pamir plateau.

Question 4.
What is mountain?
Answer:
Mountain is expansive, rocky landform that is generally higher than 900 m.

Question 5.
Name a young fold mountain of India.
Answer:
A young fold mountain of India is Himalaya.

Question 6.
What is Mountain Knot?
Answer:
When a few mountains chains meet in a highland is called mountain knot.

Question 7.
What are peaks?
Answer:
The narrow, pointed summits of the mountains are called peaks.

Question 8.
What are Mountain Range?
Answer:
Numerous vaiieys and peaks located over a vast stretch forms a mountain range.

Question 9.
What is valley?
Answer:
Lowland between two high ridges is called valley.

Question 10.
What are the different types of mountain according to their origin?
Answer:
According to their origin mountains are of three types-fold mountain, block mountain and volcanic mountain.

Question 11.
What is volcanic mountain?
Answer:
At the time of volcanoic erruption the ash, lava boulders come out and formed the mount{ }^{-in which is called volcanoic mountain.

Question 12.
What is mountain Chain?
Answer:
Wlren mountain peaks and valleys extended laterally is called mountain Chain.

Question 13.
What is plateau?
Answer:
A landform that suddenly rises over its surroundings with steep slopes on all sides, ge ierally over300 m high, is called a plateau.

Question 14.
Why is peateau called ‘Table land’?
Answer:
The top of the plateau is almost flat and table like. So It is called ‘Table land.’

Question 15.
What is the highest plateau of India.
Answer:
The highest plateau of India is Ladak Plateau.

Question 16.
What is Lava plalteau”?
Answer:
At the time of volcaoic erruption lava comes out and forms plateau which is called lava plateau.

Question 17.
What is Intermontane plateau?
Answer:
The p!ateau which is surrounded by the mountains is called intermontane pleteau.

Question 18.
What is What is the world’s highest plateau?
Answer:
Pamir Plateau is the highest plateau of the world.

Question 19.
What is plane?
Answer:
A plain is a low, flat stretch of land.

Question 20.
How lava plains are created?
Answer:
Lava plains are formed when lava accumulates over vast, flat, low lying stretches.

Question 21.
Give two examples of fold mountains.
Answer:
Himalayas in Asia and Andes in South America are two fold mountains.

Question 22.
Give two examples of block mountains.
Answer:
Satpura in India and Black Forest in Germany are two block mountains.

Question 23.
Give two examples of volcanic mountains.
Answer:
Vesuvias in Italy and Fujiyama in Japan are two volcanic mountains.

Question 24.
Give an example of dissected plateaus.
Answer:
Chhotanagpur plateau is a dissected plateati.

Question 25.
Give two examples of continental plateaus.
Answer:
Antarctica and Greenland are two continental plateaus.

Question 26.
What kind of plateau is Chhotanagpur plateau?
Answer:
Chhotanagpur plateau is a dissected plateau.

Question 27.
Name two famous plains of the world.
Answer:
Gangetic plains of Asia and Pampas of South America are two famous plains of the world.

Question 28.
What is the other name of lava plateau?
Answer:
Lava Plateau is also known as volcanic plateau.

Short Questions & Answers : (2 marks for each question)

Question 1.
What is endogenetic and exogenetic force?
Answer:
The force that generates in the interior of the Earth is known as endogenetic force.
Example: Earth movement force.
The outer force of the Earth’s surface is known as exogenetic force.
Example: river, wind, glacier etc.

Question 2.
What is mountain? What is mountain peak?
Answer:
Very high (900 m and above) and very extensive land mass is called mountain. Example: Himalaya

Question 3.
The conical narrow upper portion of the mountain is called peak. Example: Mount Everest. 3. What is fold mountain.
Answer:
The mountain that is formed by the pressure of the plates of two sides to the layer of the silt accumulated under the sea is called fold mountain. Example: The Himalaya of India. Andes of South America and Rocky in North America.

Question 4.
What is Block mountain?
Answer:
Cracks are created due to the earth’s movement. The middle portion of the cracks sometimes uplifts or goes down creating mountain which is called Block mountain.
Example: Satpura in India, Vosges in France and Black forest in Germany etc.

Long Questions & Answers : (3 marks for each question)

Question 1.
How are fold mountains created? Give an example.
Answer:
Fold mountains are created when two plates move together. This can be where two continental plates move towards each other or a continental and an oceanic plate. The movement of the two plates forces sedimentary rocks upwards into a series of folds.

Example: At the place of the Himalaya Mountain there was a geosyncline almost 10 crore years ago. The name of the land to its north was Angara land and to the south was gondowana land. For many years the silt, brought by the rivers of these two land was accumulated at the bed of Tethes. Due to the downward pressure of the layers of the silt the bed of Tethis went downword and the two land came closer. For this reasen the fold occured on the silt and it uplifted to form a mountain. As the fold mountain is originated from geosyncline the bredth of the mountain is lesser than the length of the mountain.

Question 2.
What is valcanic Mountain?
Answer:
Hot molten magma remains in the earth chamber. For earth’s movement or only other causes the hot molten magma expands. At that time due to changing of earth’s movement the magma comes out through any openings of the earth’s surface and deposits around the cracks to form volcanic mountain. Due to the course of time it becomes conical in shape. This is called valcanoic mountain.

The example of the volcanic mountains are Etna in Sicily, Visuvius in Italy, Kilimanjaro in Africa, Fujiyama in Japan etc. But the Guaiyati in Chilly is he highest(19.082 \mathrm{Ft})$ active volcanic mountain of the world.

Question 3.
Classify the volcanie mountain according to their shape and structure.
Answer:
According to the shape and structure the volcanic mountains are classified into four categories-i) Volcanic mountain with conical shape, ii) Volcanic mountain with dome shape, iii) Valeanic mountain with explossive crater, iv) Volcanic Mountain with composite conical.
i) Volcanic mountain with conical shape : This is formed by large explosion. It looks like cone, This type of volcano is found in Japan.
ii) Volcanic mountain with dome shape : Due to large explosion the thick magma comes out form dome shaped Volcano. This types of volcano is found in Hawai island.
iii) Volcanie mountain with explossive crater : This type of volcano is formed due to large explosion by making big crater. This type of volcanic mountain is found in lceland.
iv) Composit volcanic mountain with conical shape : When explosion countinues for long time a main erativ forms with other earths surrounded it. This type of Valcano is found in Maxico.

Question 4.
Classify Plateaus according to their origin.
Answer:
According to their origin plateaus are classified into three categories-i) Dissected plateau, ii) Intermontane plateau, iii) Lava plateau
i. Causes for the origin of dissected plateau : Sometimes the old fold mountain is eroded by the natural forces for long time to form high plateau: When the soft rocks of the high mountain eroded or brought away by the wind or river water leaving the hard rocks only as the peak of the mountain then it is called Residual plateau. The Residual plateau is sometimes dissected by narow river vally, it is called dissected plateau. The example of dissected plateaus are Bindhya plateau in India, Highland of Scottland etc.

ii. Cause for the origin of Intermontane plateaus: At the time of the formation of fold mountain the places comperatively lower uplifted to form plateaus for the earthquake. This type of plateaus are generally surrounded by the mountains. This is called inter mountaine plateau. The example of intermontane plateaus are the Tibetan plateau, Iranian plateau etc.

iii. Cause for the origin of volcanic plateaus: The lava plateau is made up with bassalt rock. The hot molten lava comes out through the openings of the earth surface and begines to accumulate to the earths surface. In due course of the time the lava cools down and hardens to form plateau. This types of plateau froms due to the accumulation of lava. Thus it is called lava plateau or volcanic plateau or depositional plateau. The example of this type of plateau in the Decan plateau in India, the Somalian and Etheopian plateau, the Puner plateau in Argentina.

Question 5.
Classify the plain according to their origin.
Answer:
According the their origin plains are classified mainly into two categories-

1. Plain of accumulation
2. Plain created by earths movement.

1. The classification of plain of accumulation : The plain of accumulation is also devided into 8 categories-

1. alluvial plain
2. flood plain
3. deltaic plain
4. coastal plain
5. lake plain
6. Lava plain
7. Glacier plain
8. loess plain

2. Plain created by earth movement : This type of plain is classified into two categories

1. uplifted and
2. downward plain.

Question 6.
Write the causes for the formation of different plains.
Answer:
i) The silt accumulated under the rivers, seas and lakes to form alluvial plain (genstic plain), ii) For the volcanic erruption of the volcano (lava plain-northen part of the Decan), iii) the plain formed by the glacier (Prairries in North America), iv) In desert region the sand blown by the wind and deposited to form plain (Loess plain in china), v) The low hills and plateau eroded to form plain (some part of the Ranchi plateau), vi) For earthquake high land goes downward to form plain (Taranian plain) or uplifted to form plain (Karamandal coast in India).

Question 7.
Write the influence of Mountains in the human life.
Answer:
Very high (900 m and above) and very extensive landmass is known as mountain. It has influence in human life-

1. The mountain has an important role in originating rivers and streams.
2. It regulates the climate.
3. The facilities of livelihood are less in this region.
4. Lack of population in this region.
5. Agriculture, industry could not be flourished in mountain region.
6. Mountain helps to grow tourism.
7. The people of the mountain region are hard and active.

Question 8.
Mention the influence of plateau in human life.
Answer:
The influences of plateau in humans life are–

1. Agriculture is not suitables in rocky plateau region.
2. The rivers of the plateau are suitable for generating hydroelectric power.
3. There is lack population in this region.
4. The pleasant weather of plateau is fit for tourism.
5. Sufficient minerals are formd in the plateau region.
6. The communication system is not so developed.

Question 9.
Write the influences of plain in human life.
Answer:
The influences of plain in human life are-

1. The alluvial soil is fentile and suitable of agriculture.
2. The pondlable water is avilable in plain.
3. The life of the people of plain is easy and comfortable.
4. Due to the facility of life is more, the people are lazy and weak.
5. The communication system is highly developed.
6. Riverine civilization has been flourished in the plain.