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Critical Thinking
Critical Thinking
24. Predict A population of prairie dogs is experiencing
high immigration and birthrates, but resources are
beginning to deplete. What could eventually happen to
this population? Give two possibilities.
25. Synthesize A species of beetle is in a period of exponential growth, but a competing species has started
sharing the same space. Is the competing species an
example of a density-dependent or a densityindependent limiting factor? Explain.
26. Evaluate Imagine that scientists introduced a disease
into the rabbit population of Australia, and the rabbit
population crashed. Was the crash caused by a densitydependent or density-independent limiting factor?
Justify your answer.
27. Apply Each year, thousands of California market squid
swim up from the ocean depths and lay millions of eggs
along California shorelines. The squid then die, leaving
their offspring to fend for themselves. Draw and label a
graph that illustrates a likely survivorship curve of the
California market squid.
Analyzing a Diagram
28. The left side of the diagram depicts
pioneer species because it shows
mosses and lichens growing on bare
rock. These species are pioneer
species because they are the first
species to grow in a previously
uninhabited area.
29. Sample Answer: Any disturbance,
such as a fire, hurricane, or volcano,
that destroys or damages the
ecosystem could make it revert to an
earlier stage of succession. Human
activity could also cause the ecosystem to regress.
The combination graph below shows changes in the
sizes of bee and mite populations in one area of the
Midwest. The mites live as parasites on the bees.
30. Interpret A decrease in the number of bees occurs
during which months?
31. Analyze Describe the trends in the bee and mite
populations from April through October.
33. Write Ad Copy Imagine that you are an advertising
agent trying to encourage a new species to move into an
environment. Design an advertisement using the
concepts from the chapter. Keep in mind that a
population will not want to move to a new area without
abundant resources. Choose a target species and make
sure that your advertisement answers the following
questions: What resources and environmental factors
would make this species want to move? What abiotic
and biotic factors does it need? Include several
vocabulary terms from the chapter.
28. Apply What part of the diagram depicts pioneer
species? Explain your answer.
29. Infer What could happen in the ecosystem shown that
could make it revert to an earlier stage of succession?
34. Apply The two zebras on page 427 are competing for
the right to mate with females. Are they engaging in
intraspecific or interspecific competition? Explain your
Unit 5: Ecology
Analyzing Data
b10hspe-0514cr.indd 452
30. A decrease in the number of bees occurs
during August, September, and October.
31. The bee population slowly and steadily
increases from early spring through midsummer. After this point, the bee population
steadily declines through the fall. The mite
population starts very low in the spring and
then starts increasing significantly as the bee
Use the graph to answer the next three questions.
32. Hypothesize What might explain the relationship
between the bee and mite population numbers?
Use the diagram below to answer the next
two questions.
Analyzing a Diagram
Analyzing Data
23. Apply A bee gathers nectar from a flower by using a
strawlike appendage called a proboscis. While on the
flower, grains of pollen attach to the bee’s back. When
the bee travels to another flower, the pollen fertilizes
the new plant. What type of symbiosis is this?
23. mutualism
24. The prairie dogs could experience a
population crash, or growth could
slow down and level off to a level
the environment can support.
25. This is a density-dependent factor
because it is the high numbers of
beetles that make the population
more susceptible to competition.
26. The crash was caused by a densitydependent limiting factor because
disease can spread more easily in a
dense population.
27. Students should draw and label a
type III survivorship curve in which
the squid have a very high birth rate
and a very high infant mortality rate.
The y-axis should represent number
of survivors, and the x-axis should
represent the percentage of maximum life span.
population begins to fall in mid-summer. It
continues its increase inversely to the bee
32. Sample Answer: As the bee population
grows, so can the mite population. Then, as
temperatures fall and bees begin to die, the
mites continue to reproduce because there
are still enough bees for them to live on,
though their rate of population growth is
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Unit 5: Ecology
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08 12:52:01 PM
For more test practice,
go to
Chapter 14: Interactions in Ecosystems
Connecting Concepts
450-453_b10hspe-0514cr.indd 453
33. The ad copy should be directed at a target
species and include resources and environmental factors that would make the species
want to move, abiotic and biotic factors it
needs, and several vocabulary terms from
the chapter.
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34. The two zebras are engaging in intraspecific
competition because the competition is
between members of the same species.
Chapter 14: Interactions in Ecosystems
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