1. Understanding Population
Population refers to the people living in a particular area, region, country or the world at a given time. Population is not static: it changes as people are born, die and move from one place to another.
2. Demography
Demography is the study of human population and how it changes over time. It examines characteristics such as age, sex, education, occupation and religion, along with population trends.
| Demographic aspect | What it tells us |
|---|---|
| Population size | How many people live in an area. |
| Population structure / composition | Characteristics such as age, sex, education, occupation and other social or economic features. |
| Birth rate | The level of births in a population over a given period, commonly expressed per 1,000 people. |
| Death rate | The level of deaths in a population over a given period, commonly expressed per 1,000 people. |
| Fertility | Childbearing patterns of a population. |
| Life expectancy | The average number of years a person is expected to live under prevailing conditions. |
| Migration | Movement of people from one place to another. |
3. How Population Changes
Natural change
Population increases through births and decreases through deaths. The balance between the two contributes to natural increase or natural decrease.
Migration
Population also changes when people move into or out of an area. In-migration adds people to a place, while out-migration reduces its population.
4. Population Growth and Density
Population growth
Population growth means a change in population size over a period. Growth can result from natural increase and migration.
Population density
Population density expresses the number of people living per unit of area, commonly persons per square kilometre.
| High density may be associated with | Low density may be associated with |
|---|---|
| Favourable climate, fertile land, water availability, jobs, transport and services. | Harsh climate, difficult terrain, limited water, sparse infrastructure or fewer economic opportunities. |
Density is a measure of concentration. A large population does not automatically mean high density; the area occupied by that population also matters.
5. Migration
Migration is the movement of people from one place to another, temporarily or permanently. It can occur within a country or across international borders.
Push factors
- Lack of employment
- Natural disasters
- Conflict or insecurity
- Limited access to services
Pull factors
- Employment opportunities
- Education
- Better services
- Family or social connections
| Type | Meaning |
|---|---|
| Rural–urban | Movement from rural areas towards towns or cities. |
| Urban–urban | Movement between towns/cities. |
| Rural–rural | Movement between rural areas. |
| International | Movement across national borders. |
6. Population Structure and Composition
Population structure or population composition refers to the characteristics of the overall population that help us understand people better. These include age, sex, education, occupation and other characteristics.
Population data are useful to governments because different groups have different needs. Businesses can also use demographic information to understand potential customers and markets.
7. Age Composition
Age composition shows the distribution of people across different age groups. It helps us understand the needs and potential of a population.
| Age group | Why it matters |
|---|---|
| Children and adolescents | Creates demand for schools, nutrition, healthcare and opportunities for development. |
| Working-age population | Forms an important part of the labour force and economic activity. |
| Older population | May require healthcare, social support and suitable living arrangements. |
As the proportion of older people increases, a society experiences population ageing. This can change the demand for healthcare, social support and other services.
8. Sex Ratio
Sex ratio represents the number of females per 1,000 males in the population. It is an important demographic indicator of gender balance.
A balanced sex ratio is important for equitable development, social stability and sustainable population growth. Differences in sex ratio across places can reflect social, economic and cultural conditions.
9. Working-age Population
The chapter identifies the working-age population as people aged 15–64 years. This group is important because it represents a major potential source of labour and economic activity.
| Population feature | Possible planning focus |
|---|---|
| Large working-age population | Education, skills, jobs, entrepreneurship and productive opportunities. |
| Large child population | Schools, nutrition, healthcare and child development. |
| Growing older population | Healthcare, social support and age-friendly facilities. |
10. Population and Development
Population and development influence one another. Population characteristics help governments plan infrastructure and services such as schools, hospitals, housing, transport and employment-related programmes.
Population is not simply a number
The quality of life of people depends on factors such as education, health, skills, employment and access to services. Therefore, demographic information must be understood alongside social and economic conditions.
11. India: Key Population Patterns
The chapter uses India to illustrate how demographic information can reveal differences among states and regions.
- Population is unevenly distributed across India.
- States differ in their shares of the country's population.
- Age and sex composition vary across places.
- Migration can change the population of both source and destination areas.
- Population data help governments plan infrastructure and services.
12. Why Study Population?
Planning schools, hospitals, housing, transport, jobs and other services.
Understanding potential customers, markets and changing demand.
Understanding demographic changes helps communities respond to changing needs across generations.
13. Quick Revision
| Term | Meaning |
|---|---|
| Population | People living in a particular area at a given time. |
| Demography | Study of human population and its changes over time. |
| Population composition | Characteristics such as age, sex, education and occupation. |
| Birth rate | Level of births in a population over a given period. |
| Death rate | Level of deaths in a population over a given period. |
| Migration | Movement of people from one place to another. |
| Population density | Number of people per unit area. |
| Sex ratio | Number of females per 1,000 males. |
| Working-age population | People aged 15–64 years, as used in the chapter. |
| Population ageing | Increase in the proportion of older people. |
14. NCERT-Style Practice Questions
The Big Questions
- What is demography?
- What are some important concepts of demography?
- How does population change over time?
- Why is population composition important?
- What is migration? Give examples.
- What is population density?
- What is meant by sex ratio?
- Why is the working-age population important?
Short Answer
- Differentiate between population size and population density.
- Explain push and pull factors of migration.
- How can demographic data help governments?
- What is population ageing?
Long Answer
- Explain the major factors that influence population change.
- Discuss how population composition helps in development planning.
- Explain how migration can affect both source and destination regions.