Name________________________________
Test # 3 Study Guide
Know ALL of the following vocabulary terms.
MAKE FLASH CARDS TO HELP YOU STUDY THEM.
Exponential Growth
Logistic Growth
Density-dependent factor
Density-independent factor
Sustainability
Acid rain
Invasive Species
Desertification
Soil erosion
Endangered Species
Greenhouse effect
Demographic Transition Model
Fossil Fuels
Renewable
Nonrenewable
Biodiversity
1. What is the equation for population density?
Population Density = # of individuals
Area
2. A constant rate of reproduction is a characteristic of what type of growth?
Exponential Growth
3. When does a population reach carrying capacity?
When resources are low or decreased
4. Biotic and Abiotic factors that cause a population’s size to decrease are also called what type of
factors? Density –dependent and Density-Independent
5. List examples of density-independent factors.
Unusual weather, natural disasters, seasonal cycles, and human activities.
6. List examples of density-dependent factors.
Competition, predation, parasitism, and disease.
7. At the end of the demographic transition what are the birth and death rates high or low or one of
each? Explain. Both the death and births rates are low, because of improved medical care people live
longer and healthier. Then because of increased education and access to birth control people have
fewer babies.
8. The human population started to experience exponential growth after what major event?
The Industrial Revolution and the Plague
9. What has caused the most environmental change on Earth?
Humans altering the environment.
10. Why are fossil fuels nonrenewable?
Because they take so long to form, they will be depleted before new ones form.
11. What 2 compounds combine with water to form acid rain?
Nitrogen and Sulfur
12. How can we limit deforestation?
Sustainable development practices
13. Why is biodiversity the MOST valuable thing in our biosphere?
Because many species have provided us with foods, industrial products, and medicines
14. What is the greatest threat to biological diversity?
Human activity, like pollution, and introducing invasive species
Name________________________________
Test # 3 Study Guide
15. Biological magnification means that as DDT moves through the food chain, its concentration will
Increase
16. What can UV radiation cause?
Cancer, eye damage (blindness) and decreased resistance to disease.
17. What causes ozone depletion?
CFC’s Chloro-fluoro-carbons
18. How does deforestation contribute to global warming?
Reducing the number of trees in the environment increases the amount of carbon dioxide a
greenhouse gas.
19. Describe one sustainable practice.
Choose one of the following
Forest management – describe in your own words from page 146
Fishery resources – describe in your own words from page 147
Air resources – describe in your own words from page 148
Freshwater resources – describe in your own words from 149
20. What were the birth and death rates for the world throughout most of history?
Very high birth and very high death rates.
21. What advances have humans made that resulted in lower death rates?
Medicine, Nutrition, and Sanitation
22. After the demographic transition has started, how do the birth and death rates compare to one
another? What happens to the total population size?
At the beginning, birth rates stay the same, while death rates drop. This causes the population to
dramatically grow in size.
23. As societies modernize, increase their level of education and raise their standards of living what
happens to the birth rate? And what happens to the population growth?
The birth rate will decrease as education increases. The population growth will then slow down.
24. When the transition is complete what happens to the birth and death rates? And the population
growth?
At the end of the transition the death and birth rates will both be low, therefore the population will
stop growing.