Dear students of class 9C
Kindly do these remaining Q/Ans in your notebook and sharing the answer key of the word puzzle given in text book.
Solution :
(a) The oldest landmass of India (peninsular part) was a part of Gondwana land.
(b) Gondwana land included India, Australia, South Africa and South America as one single landmass.
(c) Convectional currents split the crust into a number of pieces, thereby leading to the drifting of the Indo – Australian plate after being separated from the Gondwana land towards the North.
(d) The Northward drift resulted in the collision of the plate with the much larger Eurasian plate.
(e) Due to this collision the sedimentary rocks which were accumulated in the geosyncline known as the Tethys, were folded to form the mountain systems of Western Asia and Himalaya.
(f) The Himalayas represent a youthful topography with high peaks, deep valleys and fast following rivers.
Solution : (a) The Himalayan uplift out of the Tethys sea and subsidence of the Northern flank of the peninsular plateau resulted in the formation of a large basin. In course of time, this depression gradually got filled with deposition of sediments from rivers flowing from the mountains In the north and led to formation of the fertile Northern plains.
(b) It spreads over an area of 7 lakh sq km. The plain IS about 2400 km long and 240-230 km broad
(c) It is a densely populated and an Intensively cultivated area.
(d) With Its adequate water supply and favourable climate, It is agriculturally a very productive part of India
(e) The Northern plains are broadly divided into 3 sections.
(f) The Western part of the Northern plans IS called the Punjab plains, formed by the Indus and its tributaries.
(g) The Ganga plain extends between the Ghaggar and the Teesta rivers, spread over the states of Haryana, Delhi, UP Bihar and West Bengal.
(h) The Brahmaputra Plain to the East of the Ganga plains lies the Brahmaputra plain covering the areas of Assam and Arunachal
Pradesh
Solution : •Horizontally the features ale
•Nathula
•Cardamom
•Garo
•Kanchenjunga
•Anamudi
•Everest
•Patli
•Vertically the features are
•Chottanagpur
•Aravali
•Konkan
•Jaintia
•Malwa
•Nilgirl
•Shipki La
•Vindhya
•Bomdila
•Sahyadri
•Satpura (this one is from bottom to top)
Kindly do these remaining Q/Ans in your notebook and sharing the answer key of the word puzzle given in text book.
Problem 4. Describe how the Himalayas were formed.
Solution :
(a) The oldest landmass of India (peninsular part) was a part of Gondwana land.
(b) Gondwana land included India, Australia, South Africa and South America as one single landmass.
(c) Convectional currents split the crust into a number of pieces, thereby leading to the drifting of the Indo – Australian plate after being separated from the Gondwana land towards the North.
(d) The Northward drift resulted in the collision of the plate with the much larger Eurasian plate.
(e) Due to this collision the sedimentary rocks which were accumulated in the geosyncline known as the Tethys, were folded to form the mountain systems of Western Asia and Himalaya.
(f) The Himalayas represent a youthful topography with high peaks, deep valleys and fast following rivers.
Problem 6. Give an account of the Northern plains of India.
Solution : (a) The Himalayan uplift out of the Tethys sea and subsidence of the Northern flank of the peninsular plateau resulted in the formation of a large basin. In course of time, this depression gradually got filled with deposition of sediments from rivers flowing from the mountains In the north and led to formation of the fertile Northern plains.
(b) It spreads over an area of 7 lakh sq km. The plain IS about 2400 km long and 240-230 km broad
(c) It is a densely populated and an Intensively cultivated area.
(d) With Its adequate water supply and favourable climate, It is agriculturally a very productive part of India
(e) The Northern plains are broadly divided into 3 sections.
(f) The Western part of the Northern plans IS called the Punjab plains, formed by the Indus and its tributaries.
(g) The Ganga plain extends between the Ghaggar and the Teesta rivers, spread over the states of Haryana, Delhi, UP Bihar and West Bengal.
(h) The Brahmaputra Plain to the East of the Ganga plains lies the Brahmaputra plain covering the areas of Assam and Arunachal
Pradesh
6. Write short notes on the following.
(i) The Indian Desert
Answer:
The Indian desert lies towards the western margins of the Aravali Hills. It is an undulating sandy plain covered with sand dunes. This region receives very low rainfall. The average rainfall is below 150 mm per year. It has an arid climate with low vegetation cover. Streams appear during the rainy season. Soon after they disappear into the sand as they do not have enough water to reach the sea. Luni is the only large river in this region.
(ii) The Central Highlands
Answer:
Central Highlands and the Deccan Plateau. The part of the Peninsular plateau lying to the north of the Narmada river, covering a major area of the Malwa plateau, is known as the Central Highlands. The Central Highlands are wider in the west but narrower in the east. The eastward extensions of this plateau are locally known as the Bundelkhand and Baghelkhand. The Chotanagpur plateau marks the further eastward extension, drained by the Damodar river.
(iii) The Island groups of India
Answer:
Lakshadweep Islands
Lakshadweep group of islands is composed of small coral islands. Earlier they were known as Laccadive, Minicoy and Amindive. In 1973, these were re-named as Lakshadweep. It covers a small area of 32 sq km. Kavaratti Island is the administrative headquarters of Lakshadweep. This island group has a great diversity of flora and fauna. The Pitti island, which is uninhabited, has a bird sanctuary.
Andaman and Nicobar Islands
The elongated chain of islands located in the Bay of Bengal extending from north to south. These are the Andaman and Nicobar islands. They are bigger in size and are more numerous and scattered. The entire group of islands is divided into two broad categories – The Andaman in the north and the Nicobar in the south. It is believed that these islands are an elevated portion of submarine mountains. These island groups are of great strategic importance for the country. There is a great diversity of flora and fauna in this group of islands too. These islands lie close to the equator and experience equatorial climate and have thick forest cover.
Project / Activity
Locate the peaks, passes, ranges, plateaus hills and duns hidden in the puzzle.
Try to find where these features are located. You may start your search horizontally vertically or diagonally.
Try to find where these features are located. You may start your search horizontally vertically or diagonally.
Solution : •Horizontally the features ale
•Nathula
•Cardamom
•Garo
•Kanchenjunga
•Anamudi
•Everest
•Patli
•Vertically the features are
•Chottanagpur
•Aravali
•Konkan
•Jaintia
•Malwa
•Nilgirl
•Shipki La
•Vindhya
•Bomdila
•Sahyadri
•Satpura (this one is from bottom to top)
6
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