Question 1

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.

Question 2

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.

Question 3

The standard error of the mean is equal to

Accepted Answer

A)   the sample variance divided by the sample size.
B)   the sample standard deviation divided by the square root of the sample size.
C)   the sample variance divided by the square root of the sample size.
D)   twice the square root of the sample size.
E)   twice the square root of the sample variance.

Question 4

Periodical cicadas spend 13 or 17 years

Accepted Answer

A)   feeding in tree twigs before emerging as adults.
B)   feeding on tree roots before emerging as adults.
C)   as adults before laying eggs.
D)   in a resistant, resting egg before hatching as larvae.
E)   None of the choices are correct.

Question 5

Which statement about snowshoe hare and lynx populations in boreal Canada is false?

Accepted Answer

A)   Lynx are not the only important predator of snowshoe hares.
B)   Lynx and hare populations both oscillate repeatedly, with a similar period.
C)   Snowshoe hares rarely deplete their food supply enough to affect their population biology.
D)   Trapping records kept by non-scientists can provide useful records of hare population sizes.
E)   Field experiments imply that hare cycles depend both on the hares' food and their predators. C

Question 6

Which of the following is a correct graphical representation of the Lotka-Volterra predator-prey model?

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)   both predator and prey numbers are plotted against time producing reciprocal oscillations in predator prey populations and predator numbers are plotted against prey numbers producing an elliptical oscillation in predator prey numbers E

Question 7

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 parasite

Question 8

A "negatively phototaxic" amphipod will swim

Accepted Answer

A)   away from parasitic worms.
B)   towards parasitic worms.
C)   away from competing amphipods.
D)   towards light.
E)   away from light.

Question 9

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.

Question 10

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.

Question 11

Bethel and Holmes demonstrated

Accepted Answer

A)   positive phototaxis in Acanthocephalans infected by amphipods.
B)   negative phototaxis in Acanthocephalans infected by amphipods.
C)   positive phototaxis in amphipods infected by Acanthocephalans.
D)   negative phototaxis in amphipods infected by Acanthocephalans.
E)   increased herbivory by amphipods infected by Acanthocephalans.

Question 12

Which of the following is a result of infection of Arabis by the plant parasite Puccinia monoica?

Accepted Answer

A)   formation of an elongated rosette topped by a cluster of bright yellow leaves
B)   formation of a pseudoflower that resembles the flower of a buttercup
C)   insect transfer of spermatia from one fungus to another
D)   elimination of seed formation by the host plant
E)   All of the choices are correct.

Question 13

Calculate standard error given:  mm, s = 6.2 mm, and n = 10.

Accepted Answer

A)   0.62 mm
B)   0.88 mm
C)   1.96 mm
D)   9.06 mm
E)   17.8 mm

Question 14

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

Accepted Answer

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

Question 15

_______________________ 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 16

Which statement is not true of lynx and coyote predation of the snowshoe hare?

Accepted Answer

A)   Lynx and coyote both show a strong numerical response to increases in the snowshoe hare population.
B)   Lynx show higher predation rates when snowshoe hare numbers are declining.
C)   Coyotes show higher predation rates when snowshoe hare numbers are increasing.
D)   Coyotes show a clear type 2 functional response to increases in the snowshoe hare population.
E)   At high hare densities, coyote and lynx predation rates exceed their daily energy needs.

Question 17

In most laboratory experiments, predators and prey held together in simple habitats exhibit repeated cycles in population sizes.

Accepted Answer

A) True 
 B)False  False

Question 18

An organism inducing disease in its host is called a ______________.

Accepted Answer

The answer of An organism inducing disease in its host...

Question 19

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.

Question 20

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.

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The standard error of the mean is equal to

Correct AnswerverifiedShow Answer

Periodical cicadas spend 13 or 17 years

Correct AnswerverifiedShow Answer

Which statement about snowshoe hare and lynx populations in boreal Canada is false?

Correct AnswerverifiedC

Which of the following is a correct graphical representation of the Lotka-Volterra predator-prey model?

Correct AnswerverifiedE

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

A "negatively phototaxic" amphipod will swim

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Bethel and Holmes demonstrated

Correct AnswerverifiedShow Answer

Which of the following is a result of infection of Arabis by the plant parasite Puccinia monoica?

Correct AnswerverifiedShow Answer

Calculate standard error given: mm, s = 6.2 mm, and n = 10.

Correct AnswerverifiedShow Answer

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

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

Which statement is not true of lynx and coyote predation of the snowshoe hare?

Correct AnswerverifiedShow Answer

In most laboratory experiments, predators and prey held together in simple habitats exhibit repeated cycles in population sizes.

Correct AnswerverifiedFalse

An organism inducing disease in its host is called a ______________.

Correct AnswerverifiedShow Answer

Gause's experiments with Paramecium and Didinium showed

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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"The ecolo...
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