Biology 2015

Sylvia S. Mader, Michael Windelspecht

Chapter 44

Population Ecology

Educators

Chapter Questions

Problem 1

Which of these levels of ecological study involves an interaction between abiotic and biotic components?
a. organisms
b. populations
c. communities
d. ecosystem
e. All of these are correct.

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Problem 2

In which pair is the first included in the second?
a. habitat population
b. population community
c. community ecosystem
d. ecosystem biosphere
e. All of these except a are correct.

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Problem 3

When phosphorus is made available to an aquatic community, the algal populations suddenly bloom. This indicates that phosphorus is
a. a density-dependent regulating factor.
b. a reproductive factor.
c. a limiting factor.
d. an r-selection factor.
e. All of these are correct.

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Problem 4

If a population has a type I survivorship curve (most have a long lifespan), which of these would you also expect?
a. a single reproductive event per adult
b. overlapping generations
c. reproduction occurring near the end of the lifespan
d. a very low birthrate
e. None of these are correct.

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Problem 5

A pyramid-shaped age distribution means that
a. the prereproductive group is the largest group.
b. the population will grow for some time in the future.
c. the country is more likely an LDC than an MDC.
d. fewer women are leaving the reproductive years than entering them.
e. All of these are correct.

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Problem 6

A J-shaped growth curve can be associated with
a. exponential growth.
b. biotic potential.
c. unlimited resources.
d. rapid population growth.
e. All of these are correct.

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Problem 7

Which type of growth pattern is represented by the graph below?
a. exponential
b. logistic
c. carrying capacity
d. biotic potential
e. lag growth

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Problem 8

Which of these is a density-independent regulating factor?
a. competition
b. predation
c. weather
d. resource availability
e. average age at which childbearing begins

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Problem 9

Fluctuations in population growth can correlate to changes in
a. predation.
b. weather.
c. resource availability.
d. parasitism.
e. All of these are correct.

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Problem 10

A species that has many relatively small offspring, lives for a short period of time, and provides minimal parental care is exemplifying
a. r-selection.
b. K-selection.
c. a mixture of r-selection and K-selection.
d. density-dependent and density-independent regulation.
e. a pyramid-shaped age-structure diagram.

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Problem 11

In a tropical rain forest, which group of organisms is most likely to exhibit K-selection?
a. frogs
b. grasshoppers
c. monkeys
d. algae
e. bacteria

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Problem 12

Because of the postwar baby boom, the U.S. population
a. can never level off.
b. presently has a pyramid-type age distribution.
c. is subject to regulation by density-dependent factors.
d. is more conservation-minded than before.
e. None of these are correct.

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Problem 13

Which country leads the world in coal consumption per person?
a. China
b. Canada
c. United States
d. India
e. Mexico

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