Question 1

Keystone predators can maintain species diversity in a community if they ________.

Accepted Answer

A)   competitively exclude other predators
B)   prey on the community's dominant species
C)   allow immigration of other predators
D)   prey only on the least abundant species in the community

Question 2

Which of the following could qualify as a top-down control on a grassland community?

Accepted Answer

A)   limitation of plant biomass by rainfall amount
B)   influence of temperature on competition among plants
C)   influence of soil nutrients on the abundance of grasses versus wildflowers
D)   effect of grazing intensity by bison on plant species diversity

Question 3

The symbols +, -, and 0 are to be used to show the results of interactions between individuals and groups of individuals. The symbol + denotes a positive interaction, - denotes a negative interaction, and 0 denotes where individuals are not affected by interacting. The first symbol refers to the first organism mentioned. What interactions exist between mycorrhizae and evergreen tree roots?

Accepted Answer

A)   +/+
B)   +/0
C)   +/-
D)   0/0

Question 4

Imagine five forest communities, each with one hundred individuals distributed among four different tree species (W, X, Y, and Z) . Which forest community would be most diverse?

Accepted Answer

A)   25W, 25X, 25Y, 25Z
B)   40W, 30X, 20Y, 10Z
C)   50W, 25X, 15Y, 10Z
D)   70W, 10X, 10Y, 10Z

Question 5

According to the nonequilibrium model of community diversity, ________.

Accepted Answer

A)   community structure remains stable in the absence of interspecific competition
B)   communities are assemblages of closely linked species that are permanently changed by disturbance
C)   interspecific interactions induce changes in community composition over time
D)   communities are constantly changing after being influenced by disturbances

Question 6

Zoonotic disease ________.

Accepted Answer

A)   is caused by suborganismal pathogens such as viruses, viroids, and prions only
B)   is caused by pathogens that are transferred from other animals to humans by direct contact or by means of a vector
C)   can only be spread from animals to humans through direct contact
D)   can only be transferred from animals to humans by means of an intermediate host

Question 7

Which of the following statements is a likely explanation for why invasive species take over communities into which they have been introduced?

Accepted Answer

A)   Invasive species are less efficient than native species in competing for the limited resources of the environment.
B)   Invasive species are not held in check by the predators and agents of disease that have always been in place for native species.
C)   Invasive species have a higher reproductive potential than native species.
D)   Invasive species come from geographically isolated regions, so when they are introduced to regions where there is more competition, they thrive.

Question 8

Which of the following is an example of Müllerian mimicry?

Accepted Answer

A)   two species of unpalatable butterfly that have the same color pattern
B)   a day-flying hawkmoth that looks like a wasp
C)   a chameleon that changes its color to look like a dead leaf
D)   one species of a non-venomous snake which rattles its tail to mimic a venomous rattlesnake

Question 9

In a particular case of secondary succession, three species of wild grass all invaded a field. By the second season, a single species dominated the field and the other two species had a lower relative abundance. A possible factor contributing to the abundances of these species in this example of secondary succession is ________.

Accepted Answer

A)   equilibrium
B)   immigration
C)   inhibition
D)   parasitism

Question 10

Use the figure to answer the following question.

Treehoppers (a type of insect)  produce honeydew, which ants use for food. Treehoppers have a major predator, the jumping spider. Researchers hypothesized that the ants would protect the treehoppers from the spiders. During a one-year study, researchers found no difference in treehopper populations in any of their control and experimental groups. What could they measure during the second year to gain information about why this might have occurred?

Accepted Answer

A)   Measure the number of ant females.
B)   Measure the relative sizes of the treehoppers.
C)   Measure the relative abundance of jumping spiders.
D)   Measure the relative sizes of different ant species.

Question 11

As you study two closely related predatory insect species, the two-spot and the three-spot avenger beetles, you notice that each species seeks prey at dawn in areas without the other species. However, where their ranges overlap, the two-spot avenger beetle hunts at night and the three-spot hunts in the morning. When you bring them into the laboratory and isolate the two different species, you discover that the offspring of both species are found to be nocturnal. You have discovered an example of ________.

Accepted Answer

A)   mutualism
B)   character displacement
C)   Batesian mimicry
D)   resource partitioning

Exam 54: Community Ecology

Zoonotic disease ________.

Correct Answer
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Which of the following could qualify as a top-down control on a grassland community?

Correct Answer
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According to the nonequilibrium model of community diversity, ________.

Correct Answer
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Correct Answer
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Imagine five forest communities, each with one hundred individuals distributed among four different tree species (W, X, Y, and Z) . Which forest community would be most diverse?

Correct Answer
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Correct Answer
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Which of the following is an example of Müllerian mimicry?

Correct Answer
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Correct Answer
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Correct Answer
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Which of the following statements is a likely explanation for why invasive species take over communities into which they have been introduced?

Correct Answer
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Keystone predators can maintain species diversity in a community if they ________.

Correct Answer
verified

Exam 54: Community Ecology

Zoonotic disease ________.

Correct AnswerverifiedShow Answer

Which of the following could qualify as a top-down control on a grassland community?

Correct AnswerverifiedShow Answer

According to the nonequilibrium model of community diversity, ________.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Imagine five forest communities, each with one hundred individuals distributed among four different tree species (W, X, Y, and Z) . Which forest community would be most diverse?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following is an example of Müllerian mimicry?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following statements is a likely explanation for why invasive species take over communities into which they have been introduced?

Correct AnswerverifiedShow Answer

Keystone predators can maintain species diversity in a community if they ________.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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