Chapter 15 · ICSE Class 10 Biology (Selina Concise)

Population — The Increasing Numbers and Rising Problems

The world's human population has grown enormously in a short time. Explore what drives population growth and the challenges it brings.

📈 Chapter 15

Factors affecting population size Population size increases with birth rate and immigration, and decreases with death rate and emigration Population Size + Births + Immigration − Deaths − Emigration
15.1

Factors Affecting Population Size

A population's size increases with births and immigration, and decreases with deaths and emigration.

1

Name two factors that increase a population's size.

Births and immigration

2

Name two factors that decrease a population's size.

Deaths and emigration

15.2

Problems Caused by Rapid Population Growth

Rapid population growth can strain resources such as food, water, housing, and healthcare, making it harder for a region to support everyone adequately.

1

Name one resource that can become strained by rapid population growth.

Answers vary — e.g. food, water, housing, or healthcare

Practice

Exercises

1. Name two factors that increase population size.

2. Name two factors that decrease population size.

3. Name one resource that can be strained by rapid population growth.

4. What does 'emigration' mean?

5. What does 'immigration' mean?

6. Why might a country with rapid population growth struggle to provide enough healthcare?

7. If birth rate equals death rate and there is no migration, what happens to population size?

8. Why is unchecked population growth considered unsustainable in the long run?

9. Name one way a government might try to manage rapid population growth.

10. Why might population growth put pressure on wildlife habitats and forests?