CBSE Class 11 Geography Chapter 2: Structure and Physiography NCERT Solutions

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NCERT Solutions PDF Class 11 PDF

This resource provides detailed NCERT Solutions for Class 11 Geography, Chapter 2: Structure and Physiography. It covers key concepts related to India's diverse landforms, including the Himalayan formations, coastal plains, and island groups. The solutions offer clear explanations for various geographical features and their locations, such as the Karewa formation, Loktak Lake, and the Dodabeta peak. It also delves into the characteristics of the western coastal plain and the geomorphological features of river valleys like the Bhabar. These solutions are designed to help students understand the physical geography of India, clarify doubts, and prepare effectively for their examinations by providing step-by-step explanations and accurate information.

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BoardCBSE
ClassClass 11
SubjectGeography
Session2026
LanguageEnglish
TypeNCERT Solutions
Chapter2. Structure and Physiography

Chapter summary

Chapter 2, 'Structure and Physiography,' focuses on the diverse physical features of India. This NCERT Solutions set explains the formation and location of key landforms like the Karewa formations in the Kashmir Himalayas, the Loktak lake in Manipur, and the 10° Channel separating the Andaman and Nicobar Islands. It also details the Dodabeta peak's location in the Nilgiri hills and contrasts the island groups of the Arabian Sea and the Bay of Bengal. The solutions clarify why the western coastal plain lacks deltas and describe geomorphological features of river valleys, such as the Bhabar.

Learning outcomes

  • Identify the geographical location of the Karewa formation.
  • Locate Loktak lake and the Dodabeta peak.
  • Differentiate between the island groups of the Arabian Sea and the Bay of Bengal.
  • Explain the geomorphological features of river valley plains.
  • Understand the reasons for the absence of deltas on the western coastal plain.
  • Identify regions with cold desert conditions in India.

Topics covered

Paper topics

  • Karewa Formation
  • Himalayan Regions
  • Loktak Lake
  • Andaman and Nicobar Islands
  • Lakshadweep Islands
  • 10° Channel
  • Dodabeta Peak
  • Nilgiri Hills
  • Western Coastal Plain
  • River Valley Plains
  • Bhabar
  • Cold Deserts

Important topics

  • Structure and Physiography of India
  • Himalayan Regions
  • Island Groups of India
  • Coastal Plains
  • Geomorphological Features of River Valleys
  • Cold Desert Regions

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Questions and Solutions

Question 1

In which part of the Himalayas do we find the Karewa formation?
  1. North-eastern Himalayas
  2. Himachal-Uttarakhand Himalayas
  3. Eastern Himalayas
  4. Kashmir Himalayas
Solution: The Karewa formations are a unique geological feature characterized by thick deposits of glacial clay and alluvial sediments. These formations are primarily found in the **Kashmir Himalayas**. They are particularly important for agriculture, especially for the cultivation of saffron.

Question 2

In which of the following states is Loktak lake situated?
  1. Kerala
  2. Uttarakhand
  3. Manipur
  4. Rajasthan
Solution: Loktak Lake is a significant natural landmark located in the state of **Manipur**. It is the largest freshwater lake in Northeast India and is famous for its floating 'phumdis' (heterogeneous masses of vegetation, soil, and organic matter).

Question 3

Which one of the water bodies separates the Andaman from the Nicobar?
  1. 11° Channel
  2. Gulf of Mannar
  3. 10° Channel
  4. Andaman Sea
Solution: The water body that separates the Andaman Islands from the Nicobar Islands is the **10° Channel**. This channel is a strait that lies between the Ten Degree North latitude and the islands.

Question 4

On which of the following hill range is the 'Dodabeta' peak situated?
  1. Nilgiri hills
  2. Anaimalai hills
  3. Cardamom hills
  4. Nallamala hills
Solution: The 'Dodabeta' peak is situated on the **Nilgiri hills**. It is the highest peak in the Nilgiri mountain range, located in the Western Ghats of Tamil Nadu, and forms the highest point of the Nilgiri Biosphere Reserve.

Question 5

If a person is to travel to Lakshadweep, from which coastal plain does he prefer and why?
Solution: A person travelling to Lakshadweep would prefer to start from the **Kerala coastal plain** (also known as the Malabar coast). This is because Lakshadweep is located approximately 280 to 480 kilometres off the coast of Kerala, making it the closest and most accessible mainland coastal region for reaching the islands.

Question 6

Where in India will you find a cold desert? Name some important ranges of this region.
Solution: A cold desert is found in the **Leh-Ladakh region** of Jammu and Kashmir. This area is a high-altitude desert because the Himalayas create a significant rain shadow, blocking monsoon clouds. Important mountain ranges surrounding this region include the **Zaskar Range**, the **Ladakh Range**, and the **Karakoram Range**. The primary source of water in this arid region is the winter snowfall on the mountains.

Question 7

Why is the western coastal plain devoid of any delta?
Solution: The western coastal plain is largely devoid of significant deltas primarily because the rivers originating from the Western Ghats are relatively short and swift. These rivers, such as the Narmada and Tapi, flow through a narrow plain and have a steep gradient. Consequently, they carry less sediment load and do not have the conditions necessary for extensive delta formation, unlike the longer, slower-moving rivers on the eastern coast.

Question 8

Make a comparison of the island groups of the Arabian Sea and the Bay of Bengal.
Solution: India has two major island groups: the Andaman and Nicobar Islands in the Bay of Bengal and Lakshadweep in the Arabian Sea. Andaman and Nicobar Islands:
  • This group consists of about 572 islands and islets.
  • It is divided into two main parts: the Andaman group in the north and the Nicobar group in the south.
  • These islands are generally believed to be an elevated portion of submarine mountains.
  • Some of the smaller islands are volcanic in origin.
Lakshadweep Islands:
  • This group includes Lakshadweep and Minicoy.
  • These islands are located at a distance of 280 km to 480 km off the Kerala coast.
  • The entire island group is built up of coral deposits.
  • There are approximately 36 islands in this archipelago.
  • Minicoy is the largest island, covering an area of 453 sq. km.
  • The islands feature storm beaches composed of unconsolidated pebbles, shingles, cobbles, and boulders along their eastern seaboards.

Question 9

What are the important geomorphological features found in the river valley plains?
Solution: The river valley plains, particularly the Great Plains of India, exhibit several important geomorphological features formed by the depositional action of rivers. One such significant feature is the **Bhabar**.

The Bhabar is a narrow, porous, and pebble-studded belt that lies along the foothills of the Shiwaliks. It extends from the river Indus in the west to the river Tista in the east. This belt is approximately 10 to 20 km wide. Streams and rivers descending from the mountains deposit their coarser materials, like pebbles and boulders, in this region, leading to the formation of porous beds where surface water often disappears underground.

Common mistakes

  • Confusing the location of specific geographical features like Karewa formations or Dodabeta peak.
  • Incorrectly identifying the water body separating the Andaman and Nicobar Islands.
  • Not clearly distinguishing between the characteristics of the island groups in the Arabian Sea and the Bay of Bengal.
  • Incomplete explanations for the absence of deltas on the western coastal plain.

Revision tips

  • Use a map to locate all the mentioned geographical features like the Karewa formation, Loktak lake, and Dodabeta peak.
  • Create a table to compare the key characteristics of the Andaman & Nicobar Islands and the Lakshadweep Islands.
  • Focus on understanding the 'why' behind geographical phenomena, such as why the western coast lacks deltas.
  • Review the descriptions of geomorphological features like Bhabar to understand river valley plains better.

Practice MCQs

Q1. The Karewa formations, known for their alluvial deposits, are primarily found in which region of the Himalayas?

Q2. Which water body separates the Andaman Islands from the Nicobar Islands?

Q3. The peak 'Dodabeta' is situated on which of the following hill ranges?

Q4. Which coastal plain is preferred for travel to Lakshadweep due to its proximity?

Q5. Cold desert conditions in India are found in which region?

Frequently asked questions

What is the significance of the Karewa formation mentioned in Chapter 2?

The Karewa formation is significant as it is found in the Kashmir Himalayas and is known for its thick deposits of glacial clay and alluvial sediments, which are important for agriculture, especially saffron cultivation.

Which geographical feature separates the Andaman and Nicobar Islands?

The 10° Channel is the water body that separates the Andaman Islands from the Nicobar Islands.

Why is the western coastal plain different from the eastern coastal plain in terms of deltas?

The western coastal plain is generally narrow and has swift, short rivers originating from the Western Ghats. These rivers carry less sediment and flow rapidly, preventing the formation of large deltas, unlike the longer rivers of the east.

Where is the Dodabeta peak located, and why is it important?

Dodabeta peak is situated in the Nilgiri hills of the Western Ghats. It is the highest peak in the region and offers panoramic views.

What are the main characteristics of the island groups of India?

India has two main island groups: the Andaman and Nicobar Islands in the Bay of Bengal (largely volcanic and elevated submarine mountains) and Lakshadweep in the Arabian Sea (made of coral deposits).

How do these NCERT Solutions help in exam preparation?

These solutions provide clear, step-by-step answers to the questions from the NCERT textbook, helping students understand complex geographical concepts, revise key facts, and practice answering questions accurately for their exams.

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