A population's carrying capacity
a. May change as environmental conditions change
b. Can be accurately calculated using the logistic growth model
c. Increases as the per capita population growth rate decreases
d. Can never be exceeded

Population ecologists follow the fate of same-age cohorts to

a. Determine a population's carrying capacity

b. Determine the birth rate and death rate of each group in a population

c. Determine if a population is regulated by density-dependent processes

d. Determine the factors that affect the size of a population

Use this graph of the idealized exponential and logistic growth curves to complete the following.

a. Label the axes and curves on the graph.

b. Give the formula that describes the blue curve.

c. What does the dotted line represent?

d. For each curve, indicate and explain where population growth is the most rapid.

e. Which of these curves best represents global human population growth?

What is usually true of exponential growth? Select True or False for each statement.

T/F The population is growing.

T/F The per capita growth rate is constant.

T/F The per capita growth rate increases rapidly over time.

T/F The per capita growth rate is very high.

Add labels to the figure that follows, which illustrates the predicted pattern of changes in human population growth rates when death rates fall.

The graph below shows the demographic transition for a hypothetical country. Many developed countries that have achieved a stable population size have undergone a transition similar to this. Answer the following questions concerning this graph.

a. What does the blue line represent? The red line?

b. This diagram has been divided into four sections.

Describe what is happening in each section.

c. In which section(s) is the population size stable?

d. In which section is the population growth rate the highest?

In what populations does exponential growth tend to occur?

a. Populations that colonize new habitats

b. Populations that experience intense competition

c. Populations that experience high rates of predation

d. Populations that have surpassed their carrying capacity

Explain why a decrease in population growth rate is expected as a nonhuman population approaches carrying capacity.

Scientific study of the population cycles of the snowshoe hare and its predator, the lynx has revealed that

a. Predation is the dominant factor affecting prey population cycling.

b. Hares and lynx are so mutually dependent that each species cannot survive without the other.

c. Both hare and lynx population sizes are affected mainly by abiotic factors.

d. The hare population is r-selected and the lynx population is K-selected.