Chapter 2: The World Population – Distribution, Density and Growth – Class 12 Geography

Here is the complete and comprehensive study guide for Class 12 Geography, Chapter 2: The World Population – Distribution, Density and Growth

This guide includes the Quick Chapter Note, Textbook Solutions, 10 Previous Year Questions (PYQs), and 10 Additional Important Questions tailored to the board examination marking scheme.

Chapter 2: The World Population – Distribution, Density and Growth

1. Chapter Summary (Quick Revision Note)

• Patterns of Population Distribution: The world’s population is highly uneven. About 90% of the world’s population lives in just 10% of its land area. The 10 most populous countries contribute about 60% of the world’s population (6 of these are in Asia).
• Density of Population: It is the ratio between the number of people and the size of the land. It is calculated as: Density = Population ÷ Area (measured in persons per sq km).
• Factors Influencing Population Distribution:
  • Geographical Factors: Availability of water (river valleys are dense), Landforms (flat plains are preferred over mountains), Climate (extreme climates are sparsely populated), and Soils (fertile loamy soils attract agriculture).
  • Economic Factors: Minerals (mining attracts industries and labor), Urbanisation (cities offer better jobs and civic amenities), and Industrialisation (provides job opportunities).
  • Social and Cultural Factors: Places with religious/cultural significance attract people, while political unrest or wars push people away.
• Components of Population Change:
  • Births: Measured by Crude Birth Rate (CBR).
  • Deaths: Measured by Crude Death Rate (CDR).
  • Migration: Movement of people. Includes Immigration (moving in) and Emigration (moving out).
• Factors of Migration:
  • Push Factors: Make the place of origin less attractive (e.g., unemployment, poor living conditions, political turmoil, natural disasters).
  • Pull Factors: Make the destination more attractive (e.g., better job opportunities, peace, stability, pleasant climate).
• Demographic Transition Theory: Describes how a society’s population changes as it develops:
  • Stage I: High birth rate and high death rate (slow growth, primitive agrarian society).
  • Stage II: High birth rate but declining death rate due to better health/sanitation (rapid population expansion).
  • Stage III: Low birth rate and low death rate (stable or slow growth, urbanized and industrialized society).
• Population Control Measures: Family planning is crucial. Thomas Malthus (1798) stated that population increases faster than food supply, leading to crashes via famine, disease, or war if not controlled.

2. Complete Textbook Exercises (Zero-Skip Solutions)

Q1. Choose the right answer from the four alternatives given below.
(i) Which one of the following continents has the highest growth of population?
(a) Africa (b) South America (c) Asia (d) North America

• Answer: (a) Africa

(ii) Which one of the following is not an area of sparse population?
(a) The Atacama (b) South-east Asia (c) Equatorial region (d) Polar regions

• Answer: (b) South-east Asia (It is a densely populated region).

(iii) Which one of the following is not a push factor?
(a) Water shortage (b) Medical/educational facilities (c) Unemployment (d) Epidemics

• Answer: (b) Medical/educational facilities (This is a pull factor).

(iv) Which one of the following is not a fact?
(a) Human population increased more than ten times during the past 500 years.
(b) Population growth is high in the first stage of demographic transition?

• Answer: (b) Population growth is high in the first stage of demographic transition? (This is false. In the first stage, growth is slow because high birth rates are canceled out by high death rates).

Q2. Answer the following questions in about 30 words.
(i) Name three geographical factors that influence the distribution of population.

• Answer: Three geographical factors are:
  1. Availability of water: People prefer living near fresh water sources for drinking and agriculture.
  2. Landforms: Flat plains are preferred over rugged mountains for farming and transport.
  3. Climate: Moderate climates attract more people than extreme hot or cold deserts.

(ii) There are a number of areas with high population density in the world. Why does this happen?

• Answer: High population density occurs in areas that offer favorable geographical conditions (like fertile soil, flat terrain, and fresh water) combined with strong economic opportunities (like mineral deposits, industrialization, and urbanization) which attract large numbers of people.

(iii) What are the three components of population change?

• Answer: The three components of population change are Births (fertility), Deaths (mortality), and Migration (movement of people in or out of a region).

Q3. Distinguish between:
(i) Birth rate and death rate.

• Answer:
  • Birth Rate (CBR): It is expressed as the number of live births in a year per thousand of the population in a particular region. It leads to population growth.
  • Death Rate (CDR): It is expressed as the number of deaths in a particular year per thousand of the population in a particular region. A decline in death rate also leads to population growth.

(ii) Push factors and pull factors of migration.

• Answer:
  • Push Factors: These are negative conditions that force people to leave their place of origin, such as unemployment, poverty, political turmoil, natural disasters, and epidemics.
  • Pull Factors: These are positive conditions that attract people to a new destination, such as better job opportunities, good living conditions, peace, stability, and better healthcare.

Q4. Answer the following questions in about 150 words.
(i) Discuss the factors influencing the distribution and density of population in the world.

• Answer: The distribution and density of population are influenced by three main categories of factors:
  1. Geographical Factors: Water is essential for life, making river valleys densely populated. Flat plains are preferred for agriculture and transport, whereas mountains are sparsely populated. Extreme climates (deserts/polar regions) discourage settlement, while moderate climates attract it. Fertile soils also support dense agricultural populations.
  2. Economic Factors: Areas rich in minerals attract mining and industrial activities, generating employment and drawing skilled labor (e.g., Katanga copper belt). Urbanization offers better education, health, and transport, pulling rural migrants. Industrial belts provide massive job opportunities, making regions like Kobe-Osaka in Japan highly dense.
  3. Social and Cultural Factors: Places with religious or cultural significance attract settlements. Conversely, areas facing social or political unrest experience out-migration. Sometimes, governments also provide incentives to settle in sparse areas.

(ii) Discuss the three stages of demographic transition.

• Answer: The Demographic Transition Theory explains how a society’s population changes as it develops economically and socially. It has three stages:
  • First Stage: Characterized by high fertility (births) and high mortality (deaths). People reproduce more to compensate for high death rates caused by epidemics and food shortages. Population growth is very slow. The society is primitive, agrarian, and mostly illiterate.
  • Second Stage: Fertility remains high initially but gradually declines. However, mortality drops sharply due to improvements in sanitation, healthcare, and food supply. This large gap between high birth rates and low death rates leads to a rapid expansion or “population explosion.”
  • Third Stage: Both fertility and mortality decline considerably and balance each other out. The population becomes stable or grows very slowly. The society is highly urbanized, literate, technologically advanced, and deliberately controls family size.

3. Previous Year Questions (PYQs 2015-2024 & 2025)

Short Answer Type (1-2 Marks):

1. Define density of population. (PYQ 2015, 2019)

• Answer: Density of population is the ratio between the number of people and the size of the land they occupy. It is usually measured in persons per square kilometer (Density = Population / Area).

2. What is the formula to calculate Crude Birth Rate (CBR)? (PYQ 2016, 2021)

• Answer: CBR = (Bi / P) × 1000, where ‘Bi’ is live births during the year and ‘P’ is the estimated mid-year population.

3. Who proposed the theory that population increases faster than food supply? (PYQ 2017, 2022)

• Answer: Thomas Malthus proposed this theory in 1798.

4. What is the difference between Natural Growth and Actual Growth of population? (PYQ 2018, 2023)

• Answer: Natural Growth is simply the difference between Births and Deaths (Births – Deaths). Actual Growth includes migration as well (Births – Deaths + In-Migration – Out-Migration).

5. Name any two push factors of migration. (PYQ 2020, 2025 )

• Answer: Unemployment and natural disasters.

Long Answer Type (3-5 Marks):

6. Explain how economic factors affect the distribution of population. (PYQ 2016, 2022) [3 Marks]

• Answer: Economic factors greatly influence population distribution:
  • Minerals: Mining areas generate employment, attracting skilled and semi-skilled workers (e.g., Katanga Zambia copper belt).
  • Urbanisation: Cities offer better jobs, education, and medical facilities, pulling people from rural areas.
  • Industrialisation: Industrial belts provide jobs not just in factories but also in transport, banking, and services, leading to dense populations (e.g., Kobe-Osaka region).

7. Differentiate between Immigration and Emigration. (PYQ 2017, 2024) [3 Marks]

• Answer:
  • Immigration: It refers to migrants moving into a new place or country. People who immigrate are called Immigrants. It increases the population of the destination.
  • Emigration: It refers to migrants moving out of a place or country. People who emigrate are called Emigrants. It decreases the population of the place of origin.

8. Discuss Thomas Malthus’s theory of population. (PYQ 2019, 2023) [3 Marks]

• Answer: In 1798, Thomas Malthus stated that the human population grows at a much faster rate than the food supply. He warned that if population growth is not controlled by preventive checks (like family planning), nature will impose physical checks in the form of famine, disease, and war, leading to a sudden and catastrophic population crash.

9. Why are river valleys the most densely populated areas of the world? (PYQ 2015, 2021) [3 Marks]

• Answer: River valleys are densely populated because they provide easy access to fresh water, which is the most important factor for life. Water is essential for drinking, cooking, bathing, cattle rearing, and crop irrigation. Additionally, river valleys usually have flat terrain and fertile soils, which are highly favorable for intensive agriculture and building transport networks.

10. Explain the Demographic Transition Theory with the help of a diagram. (PYQ 2018, 2025 Expected) [5 Marks]

• Answer:(Draw a simple line graph showing Stage 1, 2, and 3 as given in Fig 2.2 of the textbook). The Demographic Transition Theory predicts future population changes as a society evolves.
  • Stage I: High birth and death rates. Slow growth. Primitive, agricultural society with low life expectancy.
  • Stage II: High birth rate but rapidly falling death rate due to improved medical and sanitation facilities. This causes a population explosion (Expanding stage).
  • Stage III: Low birth and death rates. Population growth stabilizes. Society is urbanized, literate, and uses family planning.

4. Additional Important Questions

Short Questions (1-2 Marks):

1. What percentage of the world’s population lives in 10% of its land area?

• Answer: Broadly, 90% of the world’s population lives in about 10% of its land area.

2. What is meant by the ‘Place of Origin’ and ‘Place of Destination’ in migration?

• Answer: The place people move from is the Place of Origin (population decreases here), and the place they move to is the Place of Destination (population increases here).

3. Give an example of a region that is thickly populated due to industrialization.

• Answer: The Kobe-Osaka region of Japan.

4. What is Negative Growth of Population?

• Answer: If the population decreases between two points in time (when the death rate is higher than the birth rate, or people migrate out), it is called negative growth.

5. Name two countries currently in Stage III of the demographic transition.

• Answer: Japan and Canada (or the USA).

Long Questions (3-5 Marks):

6. How do landforms and climate act as geographical factors influencing population distribution? [3 Marks]

• Answer:
  • Landforms: People prefer flat plains and gentle slopes because they are ideal for agriculture, building houses, and laying roads. Mountains hinder transport and industrial development, making them sparsely populated (e.g., Himalayas).
  • Climate: Extreme climates (too hot, too cold, or too wet) are uncomfortable for habitation. Areas with moderate, pleasant climates (like the Mediterranean regions) attract more people.

7. “Family planning is a significant factor in limiting population growth.” Elaborate. [3 Marks]

• Answer: Family planning involves spacing or preventing the birth of children. It is crucial for controlling rapid population growth, which puts immense pressure on a country’s resources. Access to contraceptives, awareness propaganda, and tax disincentives for large families help stabilize the population. It also significantly improves women’s health by preventing frequent pregnancies.

8. Explain the concept of ‘Positive Growth of Population’. [3 Marks]

• Answer: Positive growth of population occurs when the number of inhabitants in a region increases between two points in time. This happens under two conditions:
  1. When the birth rate is higher than the death rate in that region.
  2. When people from other countries or regions migrate permanently into that region (Immigration).

9. Why did primitive societies have high fertility and high mortality rates? [3 Marks]

• Answer: Primitive societies (in Stage I of demographic transition) had high mortality rates due to a lack of medical facilities, frequent epidemics, and an unstable food supply. To compensate for these high death rates, people reproduced more, leading to high fertility. Furthermore, in their agrarian setup, large families were considered an economic asset for agricultural labor.

10. Critically analyze the impact of migration on both the place of origin and the place of destination. [5 Marks]

• Answer: Migration is a spontaneous effort to achieve a better balance between population and resources.
  • Impact on Place of Origin: The population decreases. It can reduce the pressure on local resources and reduce unemployment. However, it often leads to a “brain drain” or loss of young, able-bodied workforce, leaving behind the elderly and children.
  • Impact on Place of Destination: The population increases. It provides cheap and skilled labor for industries and urban centers, boosting economic growth. However, rapid influx causes overcrowding, pressure on civic amenities (housing, water, health), and can lead to the growth of slums and social tensions.