Question 1

Match each element from a functional response model to its correct meaning.

-α

Accepted Answer

A)   handling time
B)   rate of prey availability
C)   per capita availability of prey
D)   prey abundance
E)   searching timeF) All of the above
G) A) and D)

Question 2

Gause's experiments with Paramecium and Didinium showed

Accepted Answer

A)   extinction of the predator, followed by extinction of the prey, in all habitats.
B)   coexistence of predator and prey at fairly constant population sizes, in all habitats.
C)   coexistence of predator and prey, but with oscillating population sizes, in all habitats.
D)   coexistence of predator and prey at fairly constant population sizes, but only in the presence of refuges and predator reservoirs.
E)   coexistence of predator and prey with oscillating population sizes, but only in the presence of refuges and predator reservoirs.F) None of the above
G) B) and C)

Question 3

Which of the following is not an example of altered behavior of the pill bug, Armadillidum vulgare, when infected by the parasite, Plagiorhynchus cylindraceus?

Accepted Answer

A)   Spends less time in sheltered areas
B)   Positive phototaxis
C)   Spends more time in low humidity environments
D)   Seeks out light substrates
E)   All are examples of altered behavior of the pill bug when infected by the parasiteF) B) and D)
G) B) and E)

Question 4

Research by Erik Lindström and his colleagues clearly showed that red foxes have significant influence on the abundance of mountain hares

Accepted Answer

A) True 
 B)False  True

Question 5

A species feeding on the tissue of its host, while not killing it directly, is a

Accepted Answer

A)   predator.
B)   parasite.
C)   parasitoid.
D)   cannibal.
E)   debilitator.F) A) and B)
G) D) and E)

Question 6

The presence of parasitic protozoa in a culture of competing Tribolium castaneum and T. confusum

Accepted Answer

A)   can reverse the outcome of competition.
B)   decreases the likelihood of coexistence.
C)   has no effect on the outcome of competition.
D)   increases the likelihood of coexistence.
E)   has an effect on the outcome of competition only in the presence of predatory birds.F) A) and E)
G) C) and D)

Question 7

________ is the idea that predators can have non-lethal effects on prey's behavior in which they avoid high-risk locations.

Accepted Answer

"The ecolo...

Question 8

In the Lotka-Volterra predation model, a prey (host)  population in the absence of predators would

Accepted Answer

A)   grow exponentially.
B)   grow logistically.
C)   grow exponentially, and then crash when it has outstripped its own food supply.
D)   decline to extinction.
E)   The model makes no assumptions about what happens in the absence of predators.F) D) and E)
G) All of the above

Question 9

Which of the following factors can stabilize predator-prey relationships by providing a prey refuge?

Accepted Answer

A)   An area of prey habitat where predators cannot enter
B)   An area of prey habitat that is isolated and difficult for predators to find
C)   The occurrence of prey in numbers too large for predators to attack effectively
D)   The ability of prey to grow to a size invulnerable to predation
E)   All of the choices are correct.F) A) and B)
G) B) and C)

Question 10

In the Lotka-Volterra predation model, a predator population in the absence of prey (hosts)  would

Accepted Answer

A)   grow exponentially.
B)   grow logistically.
C)   decline as predators die.
D)   decline at first, but then increase as predators switch to other modes of feeding.
E)   decline at first, but then reach a small equilibrium population size.F) A) and B)
G) B) and D) C

Question 11

Match the organism with the correct type of exploitation.
-A dragonfly larva lives in a pond where it hunts and kills tadpoles and other insects.

Accepted Answer

A)   predator
B)   pathogen
C)   parasiteD) A) and B)
E) All of the above

Question 12

Which of the following is not a hypothesis that was proposed to explain population dynamics of lynx and snowshoe hares?

Accepted Answer

A)   Overpopulation of hares leads to reduced food quantity and quality.
B)   Lynx populations grow in response to increasing hare availability, and then eventually reduce hare populations.
C)   Variation in intensity of solar radiation affects hares and their food supply, and lynx populations respond to changes in hare abundance.
D)   Variation in the severity of winters drives changes in hare populations, which in turn influences lynx abundance.
E)   Overpopulation of hares leads to high levels of stress, causing the population to decline.F) B) and E)
G) B) and D)

Question 13

In Lamberti and Resh's experiment, what was the purpose of having a second grid of tiles raised 15cm above the stream bottom?

Accepted Answer

A)   To prevent algae and bacteria from colonizing the tiles
B)   To encourage algae and bacteria to colonize the tiles
C)   To prevent Helicopsyche from colonizing the tiles
D)   To encourage Helicopsyche to colonize the tilesE) A) and D)
F) A) and B)

Question 14

The value of pest control by Brazilian free-tailed bats varies across years because cotton bollworm ________ varies from year to year.

Accepted Answer

The answer of The value of pest control by Brazilian...

Question 15

The Lotka-Volterra predation model predicts that predators and prey, living together, will show

Accepted Answer

A)   oscillations in population size that increase in amplitude through time.
B)   oscillations in population size that remain of constant amplitude through time.
C)   oscillations in population size that decrease in amplitude through time.
D)   oscillations, but only when outside forces such as climatic variation are also present.
E)   steady equilibria in population sizes.F) D) and E)
G) B) and C) B

Question 16

Bats affect the cost of agriculture because

Accepted Answer

A)   they consume crops and must be controlled.
B)   they eat crop pests and reduce the amount of pesticides used.
C)   they eat crop pests and reduce the amount of crop loss.
D)   they eat crop pests and reduce both the amount of crop loss and the amount of pesticides used.
E)   their flight patterns interfere with agricultural machinery.F) A) and D)
G) A) and C)

Question 17

________ consume live plant material but do not usually kill plants.

Accepted Answer

A)   Predators
B)   Pathogens
C)   Herbivores
D)   Parasites
E)   ParasitoidsF) C) and D)
G) B) and D)

Question 18

In the Lotka-Volterra predation model, the predator death rate is represented by

Accepted Answer

A)   c.
B)   p.
C)   cp.
D)   dpNp.
E)   dp.F) A) and E)
G) B) and D)

Question 19

In the Lotka-Volterra model, the rate of predation is represented by

Accepted Answer

A)   c.
B)   p.
C)   cp.
D)   dpNp
E)   dpF) C) and D)
G) C) and E)

Question 20

Select all of the following that correctly describe graphical representations of the Lotka-Volterra predator-prey model (Select all that apply.)

Accepted Answer

A)   Predator and prey numbers are plotted against time producing reciprocal oscillations in predator-prey populations.
B)   Predator numbers are plotted against prey numbers producing reciprocal oscillations in predator-prey populations.
C)   Predator and prey numbers are plotted against time producing an elliptical oscillation in predator-prey numbers.
D)   Predator numbers are plotted against prey numbers producing an elliptical oscillation in predator-prey numbers.
E)   The difference in predator and prey numbers is plotted against population density producing a sigmoid curve that levels off at the carrying capacity.F) C) and D)
G) B) and D)

Exam 14: Exploitative Interactions: Predation, Herbivory, Parasitism, and Disease

Match each element from a functional response model to its correct meaning. -α

Correct AnswerverifiedShow Answer

Gause's experiments with Paramecium and Didinium showed

Correct AnswerverifiedShow Answer

Which of the following is not an example of altered behavior of the pill bug, Armadillidum vulgare, when infected by the parasite, Plagiorhynchus cylindraceus?

Correct AnswerverifiedShow Answer

Research by Erik Lindström and his colleagues clearly showed that red foxes have significant influence on the abundance of mountain hares

Correct AnswerverifiedTrue

A species feeding on the tissue of its host, while not killing it directly, is a

Correct AnswerverifiedShow Answer

The presence of parasitic protozoa in a culture of competing Tribolium castaneum and T. confusum

Correct AnswerverifiedShow Answer

________ is the idea that predators can have non-lethal effects on prey's behavior in which they avoid high-risk locations.

Correct Answerverified"The ecolo...View AnswerShow Answer

In the Lotka-Volterra predation model, a prey (host) population in the absence of predators would

Correct AnswerverifiedShow Answer

Which of the following factors can stabilize predator-prey relationships by providing a prey refuge?

Correct AnswerverifiedShow Answer

In the Lotka-Volterra predation model, a predator population in the absence of prey (hosts) would

Correct AnswerverifiedC

Match the organism with the correct type of exploitation. -A dragonfly larva lives in a pond where it hunts and kills tadpoles and other insects.

Correct AnswerverifiedShow Answer

Which of the following is not a hypothesis that was proposed to explain population dynamics of lynx and snowshoe hares?

Correct AnswerverifiedShow Answer

In Lamberti and Resh's experiment, what was the purpose of having a second grid of tiles raised 15cm above the stream bottom?

Correct AnswerverifiedShow Answer

The value of pest control by Brazilian free-tailed bats varies across years because cotton bollworm ________ varies from year to year.

Correct AnswerverifiedShow Answer

The Lotka-Volterra predation model predicts that predators and prey, living together, will show

Correct AnswerverifiedB

Bats affect the cost of agriculture because

Correct AnswerverifiedShow Answer

________ consume live plant material but do not usually kill plants.

Correct AnswerverifiedShow Answer

In the Lotka-Volterra predation model, the predator death rate is represented by

Correct AnswerverifiedShow Answer

In the Lotka-Volterra model, the rate of predation is represented by

Correct AnswerverifiedShow Answer

Select all of the following that correctly describe graphical representations of the Lotka-Volterra predator-prey model (Select all that apply.)

Correct AnswerverifiedShow Answer

Correct Answer
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True

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"The ecolo...
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C

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B

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