CBSE Class 11 India Physical Environment NCERT Solutions Chapter 4: Climate

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This chapter delves into the intricacies of India's climate, providing detailed NCERT Solutions for Class 11 students studying the India Physical Environment. It covers the fundamental factors influencing weather mechanisms, such as air pressure, wind distribution, upper air circulation, and the role of jet streams. The solutions explain the causes of rainfall in different regions, including the impact of monsoons, and discuss temperature variations across the country. Key concepts like the Inter-Tropical Convergence Zone (ITCZ) and Koeppen's climate classification are explained. These solutions are designed to help students grasp complex climatic phenomena, understand regional variations, and prepare effectively for their examinations by offering clear, step-by-step explanations.

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BoardCBSE
ClassClass 11
SubjectIndia Physical Environment
Session2026
LanguageEnglish
TypeNCERT Solutions
ChapterChapter 4

Chapter summary

Chapter 4 of the India Physical Environment textbook focuses on India's climate. The NCERT Solutions provided here cover the key aspects of this chapter, including the factors influencing weather, the mechanisms of monsoons, and regional climatic variations. It addresses rainfall patterns, temperature characteristics of different regions like South India, and the impact of phenomena like the Tropic of Capricorn's position. The solutions also touch upon Koeppen's climate classification and the ITCZ, offering a comprehensive understanding of India's diverse climatic conditions.

Learning outcomes

  • Understand the factors influencing the mechanism of Indian weather.
  • Identify the causes of rainfall in different coastal areas of India.
  • Differentiate between climatic conditions in various parts of India.
  • Explain the concept and significance of the Inter-Tropical Convergence Zone (ITCZ).
  • Recognize Koeppen's climate classification and its application to Indian regions.
  • Analyze the impact of solar position on atmospheric pressure and temperature in India.

Topics covered

Paper topics

  • Factors influencing Indian weather
  • Air pressure and winds
  • Upper air circulation
  • Jet streams
  • Western disturbances
  • Tropical depressions
  • Monsoon mechanism
  • Rainfall patterns
  • Temperature variations
  • Inter-Tropical Convergence Zone (ITCZ)
  • Koeppen's climate classification
  • Regional climates of India

Important topics

  • Monsoon mechanism and its influence
  • Factors affecting Indian weather
  • Inter-Tropical Convergence Zone (ITCZ)
  • Regional climatic variations
  • Koeppen's climate classification
  • Impact of solar position on climate

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Questions and Solutions

Question 1(i)

What causes rainfall on the coastal areas of Tamil Nadu in the beginning of winters?
  1. South-West monsoon
  2. Temperate cyclones
  3. North-Eastern monsoon
  4. Local air circulation
Solution:

The rainfall in the coastal areas of Tamil Nadu at the beginning of winters is primarily caused by the North-Eastern monsoon. These winds blow from the landmass towards the Bay of Bengal, picking up moisture and releasing it as rain over the coast, particularly during October and November.

Answer: (c) North-Eastern monsoon

Question 1(ii)

What is the proportion of the area of India which receives annual rainfall less than 75 cm?
  1. Half
  2. One-third
  3. Two-third
  4. Three-fourth
Solution:

A significant portion of India experiences arid or semi-arid conditions. Approximately three-fourth of the country's geographical area receives an annual rainfall of less than 75 cm. This includes regions like Rajasthan, Gujarat, and parts of the Deccan Plateau.

Answer: (d) Three-fourth

Question 1(iii)

Which one of the following is not a fact regarding South India?
  1. Diurnal range of temperature is less here.
  2. Annual range of temperature is less here.
  3. Temperatures here are high throughout the year.
  4. Extreme climatic conditions are found here.
Solution:

South India's climate is moderated by the influence of the surrounding seas (Arabian Sea, Bay of Bengal, and Indian Ocean). This proximity to water bodies leads to a less extreme climate. Consequently, both the diurnal (daily) and annual (yearly) ranges of temperature are relatively less. Temperatures remain high throughout the year due to its tropical location. Therefore, the statement that extreme climatic conditions are found here is not a fact regarding South India.

Answer: (d) Extreme climatic conditions are found here.

Question 1(iv)

Which one of the following phenomenon happens when the sun shines vertically over the Tropic of Capricorn in the southern hemisphere?
  1. High pressure develops over North-western India due to low temperatures.
  2. Low pressure develops over North-western India due to high temperatures.
  3. No changes in temperature and pressure occur in north-western India.
  4. 'Loo' blows in the North-western India.
Solution:

When the sun shines vertically over the Tropic of Capricorn (around December 22nd), it is winter in the Northern Hemisphere. During this period, North-Western India experiences very low temperatures. Cold air is dense and heavy, leading to the development of a high-pressure system over this region. Conversely, low pressure is typically associated with high temperatures, and the 'Loo' is a hot wind that blows in the summer months.

Answer: (a) High pressure develops over North-western India due to low temperatures.

Question 1(v)

In which of the following states in India do we find 'As' type of climate as per Koeppen's classification?
  1. In Kerala and coastal Karnataka
  2. In Andaman and Nicobar Islands
  3. On Coromandel Coast
  4. In Assam and Arunachal Pradesh
Solution:

Koeppen's climate classification uses symbols to denote different climate types. The 'As' type climate, characterized by a hot, dry summer and a rainy winter, is found along the Coromandel Coast of India. This region receives its rainfall during the winter season from the retreating North-Eastern monsoon.

Answer: (c) On Coromandel Coast

Question 2(i)

What are the three important factors which influence the mechanism of Indian weather?
Solution:

The mechanism of Indian weather is influenced by several factors, but three particularly important ones are:

  1. Distribution of air pressure and winds on the surface of the Earth: Variations in pressure and wind patterns create the fundamental conditions for weather phenomena.
  2. Upper air circulation: This includes factors controlling global weather and the inflow of different air masses and jet streams. Jet streams, in particular, play a crucial role in steering weather systems.
  3. Inflow of western cyclones and tropical depressions: Western disturbances, generally known as cyclones, influence winter weather, while tropical depressions significantly impact rainfall during the South-West monsoon period, creating conditions favourable for precipitation across India.

Question 2(ii)

What is the Inter-Tropical Convergence Zone?
Solution:

The Inter-Tropical Convergence Zone (ITCZ) is a broad, low-pressure trough that encircles the Earth near the equator. It is characterized by the convergence of the north-east and south-east trade winds. As these winds meet, the air tends to rise, leading to cloud formation and precipitation. The seasonal migration of the ITCZ is a primary driver of the Indian monsoon system.

Common mistakes

  • Confusing the directions of monsoons (e.g., North-Eastern vs. South-West).
  • Misinterpreting the proportion of India receiving specific rainfall amounts.
  • Incorrectly identifying characteristics of South Indian climate.
  • Failing to connect solar position (Tropic of Capricorn) with pressure systems in North-West India.
  • Misapplying Koeppen's climate classification to specific Indian regions.

Revision tips

  • Focus on understanding the role of monsoons in bringing rainfall to different parts of India.
  • Memorize the key factors that influence India's weather patterns.
  • Pay close attention to the explanations of regional climate differences, especially in South India.
  • Review the concept of ITCZ and its importance for monsoon onset.
  • Practice identifying the correct climate type for different Indian regions based on Koeppen's classification.

Practice MCQs

Q1. Which monsoon is primarily responsible for rainfall in the coastal areas of Tamil Nadu at the beginning of winter?

Q2. Approximately what fraction of India's area receives less than 75 cm of annual rainfall?

Q3. Which of the following statements is NOT a characteristic of South India's climate?

Q4. When the sun is directly over the Tropic of Capricorn in the Southern Hemisphere, what atmospheric condition typically develops over North-Western India?

Q5. According to Koeppen's classification, which region in India is characterized by 'As' type climate?

Frequently asked questions

What are the main factors that influence the weather mechanism in India?

The main factors influencing Indian weather are the distribution of air pressure and winds on the Earth's surface, upper air circulation influenced by global weather patterns and jet streams, and the inflow of western cyclones (disturbances) and tropical depressions.

Which monsoon brings rain to Tamil Nadu's coast at the start of winter?

The North-Eastern monsoon is responsible for rainfall in the coastal areas of Tamil Nadu at the beginning of winters.

What is the ITCZ and why is it important for India's climate?

The Inter-Tropical Convergence Zone (ITCZ) is a low-pressure belt near the equator where trade winds converge. Its northward and southward shift significantly influences the onset and intensity of the Indian monsoon.

How does the position of the sun affect North-Western India's climate?

When the sun shines vertically over the Tropic of Capricorn (during winter in the Northern Hemisphere), North-Western India experiences low temperatures, leading to the formation of a high-pressure system.

What does Koeppen's classification tell us about the climate of the Coromandel Coast?

According to Koeppen's classification, the Coromandel Coast experiences an 'As' type of climate, which is characterized by a dry summer and a rainy winter.

Why is the diurnal and annual range of temperature less in South India?

South India's proximity to the sea moderates its temperature, leading to smaller diurnal (daily) and annual (yearly) variations in temperature compared to continental interiors.

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