2. Human Population – Growth & Age Structure (4.2)
State Standard
SB4A. Investigate the relationships among organisms, populations, communities, ecosystems, and biomes.
SB4D. Assess and explain human activities that influence and modify the environment such as global warming, population growth, pesticide use, and water and power consumption.

3. Activator:
What can be
learned from
this graph
about Kenya?

4. What event caused human population’s lag phase to end?

5. Chapter 4
Population Ecology
4.2 Human Population
Human Population Growth Rate
The human population experienced exponential growth as humans benefitted from the Industrial Revolution, improved food production, improved health care, & disease cure/prevention

6. What trend does this graph reveal about human population growth?
Why do you think this is?

7. Chapter 4
Population Ecology
4.2 Human Population
Human Population Growth Rate Cont’d
Although the human population is still growing, the rate of its growth has slowed.
Diseases like AIDS & also voluntary population control have contributed to this slowing.

8. Population trends can be altered by events such as disease and war.
Chapter 4
Population Ecology
4.2 Human Population
Trends in Human Population Growth
Population trends can be altered by events such as disease and war.
Human population
growth is not the same in all countries.

9. Chapter 4
Population Ecology
4.2 Human Population
Trends in Human Population Growth Cont’d
Zero population growth (ZPG) occurs when the birthrate equals the death rate.
The age structure eventually should be more balanced with numbers at pre-reproductive, reproductive, and post-reproductive ages being approximately equal.

10. Trends in Human Population Growth Cont’d
Chapter 4
Population Ecology
4.2 Human Population
Trends in Human Population Growth Cont’d
Age Structure
A population’s age structure is the number of males and females in each of three age groups:
pre-reproductive stage, reproductive stage, and post-
reproductive stage.

12. What inferences can you make about specific human population groups by reading this graph?

13. Trends in Human Population Growth Cont’d
Chapter 4
Population Ecology
4.2 Human Population
Trends in Human Population Growth Cont’d
Human Carrying Capacity
Scientists are concerned about the human population reaching or exceeding the carrying capacity.
An important factor is the amount of resources from the biosphere that are used by each person.

14. When does zero population growth occur?
Chapter 4
Population Ecology
Chapter Diagnostic Questions
When does zero population growth occur?
when birth rate equals death rate
when death rate exceeds birth rate
when birth rate exceeds death rate
when there are zero births A B C D
CDQ 3

15. decreased agriculture famine and wars setbacks in medicine
Chapter 4
Population Ecology
4.2 Formative Questions
Which is a primary reason for the decline in the percent growth of the human population after 1962?
decreased agriculture
famine and wars
setbacks in medicine
voluntary population
control A B C D
FQ 5

16. Chapter 4
Population Ecology
4.2 Formative Questions
What will happen to the human population when the birthrate equals the death rate?
CDC
HPG
PGR
ZPG A B C D
FQ 6

17. Which type of population growth model does this graph represent?
Chapter 4
Population Ecology
Chapter Assessment Questions
Which type of population growth model does this graph represent?
exponential
spatial
genetic
logistic A B C D
CAQ 1

18. Chapter 4
Population Ecology
Chapter Assessment Questions
Based on the information in the graph, infer which statement accurately represents the information provided.
India has very little land for farming.
Germany is smaller per acre than the United States.
More land is used to support an individual in the United States.
A person in Indonesia requires more land than a person in Brazil. A B C D
CAQ 2