Name____________________________ Class ________________ Date ____________

 

Section 5–1 How Populations Grow (pages 130–136)

Describing Populations

1. The                                   is the area in which a population lives.

2. Population density is the                                       of individuals per unit area.

3. How the individuals are spaced in their range is a population’s                                          

4. Growth rate is how quickly a population             _______________________ in size.

5. To find the                                    of a population, count the number of males and females of each age.

Population Growth

For Questions 6–10, write True if the statement is true. If the statement is false, change the underlined word or words to make the statement true

                  6. If the death rate is less than the birthrate, the population is likely to shrink.

                  7. Immigration increases population size.

                  8. Young animals may immigrate from the place where they were born to establish new territories.

                  9. A high birthrate and immigration decrease population size.

                10. Populations grow if more individuals are born than die in a period of time.

individuals that enter or leave the population

Exponential Growth

  1. Describe the conditions in which exponential growth occurs.

 

 

  1. Complete the graph by drawing the characteristic shape of exponential population growth.

  1. What letter is used to refer to the characteristic shape of an exponential growth curve?

 

 

Logistic Growth

.

  1. Complete the graph by drawing the characteristic shape of logistic population growth.

  1. What letter is used to refer to the characteristic shape of the logistic growth curve?

 

 

  1. When real-world populations of plants and animals are analyzed, why do they most often have the logistic growth curve?

 

 

  1. What does the term carrying capacity refer to?

 

 

Section 5–2 Limits to Growth (pages 137–141)

Limiting Factors

For Questions 18–23, write True if the statement is true. If the statement is false, change the underlined word to make the statement true

                18. Limiting factors determine the immigration capacity of a population.

                19. A limiting factor controls the growth of a population.

                20. Limiting factors operate when growth is exponential.

                12. Populations grow too large in the absence of limiting factors.

                22. Competition is an example of a limiting factor.

                23. Population size can be limited by factors such as predation.

 

 

Density-Dependent Factors

  1. What is a density-dependent limiting factor?

 

 

  1. When do density-dependent factors operate most strongly?

 

 

 

  1. What are four density-dependent limiting factors??
  2. a.

 

b.

 

c.

 

d.

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


     
  1. / What happened to the number of wolves on Isle Royale between 1975 and 1985?

 

 

 

  1. What happened to the moose population when the number of wolves was low?

 

 

 

  1. What is the relationship between the moose and the wolves on Isle Royale?

 

 

 

  1. Is the number of moose on the island a density-dependent or density-independent limiting factor for the wolf?

 

 

Density-Independent Factors

  1. What term describes a limiting factor that affects all populations in similar ways, regardless of population size?

 

 

  1. What is the usual response in the population size of many species to a density-independent limiting factor?

 

 

 

  1. Complete the graphic organizer with examples of density-independent limiting factors.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

characteristically crashes.

Section 5–3 Human Population Growth (pages 142–145).

Historical Overview

For Questions 35–39, write True if the statement is true. If the statement is false, change the underlined word or words to make the statement true.

                            35. Over the last 1000 years, the size of the human population has decreased.

                             36. Since the 1800s, human population growth has been logistic.

                             37. The human population has increased because birthrates have dropped.

                             38. The combination of low death rates and high birthrates led to exponential growth.

                             39. Charles Darwin suggested that human populations are regulated by war, famine, and disease.

 

Patterns of Population Growth

Use these age structure diagrams to answer Questions 40–42

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


     
  1. Which country has gone through the demographic transition? How do you know?

 

 

 

  1. Which country do you predict will experience a slow and steady growth rate in the near future? Why?

 

 

 

 

  1. Which country is most likely to grow exponentially in the near future? Why?