Question 1

Birds are more effective predators than bats on foliage-living arthropods in tropical lowland forests.

Accepted Answer

A) True 
 B)False  False

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

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 4

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.

Question 5

Ephemerellid mayflies under attack by stoneflies will typically

Accepted Answer

A)   swim away to escape possible predation.
B)   rely on their cryptic coloration to escape detection.
C)   rely on their spiny appendages to deter attack.
D)   adopt a posture which increases their apparent size, so that the predator will avoid them.
E)   burrow into the stream bottom.

Question 6

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 7

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 8

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.

Question 9

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.

Question 10

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.

Question 11

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.

Question 12

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 13

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 14

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. A

Question 15

The defensive tactic in which prey reduce their individual probability of being eaten by occurring at very high densities is called

Accepted Answer

A)   prey satiation.
B)   prey dilution.
C)   predator dilution.
D)   predator satiation.
E)   predator masting.

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

Accepted Answer

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

Question 18

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 19

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

Accepted Answer

"The ecology of fear"

Question 20

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

Accepted Answer

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

Exam 14: Exploitative Interactions Predation, herbivory, parasitism, and Disease

Birds are more effective predators than bats on foliage-living arthropods in tropical lowland forests.

Correct AnswerverifiedFalse

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Bats affect the cost of agriculture because

Correct AnswerverifiedShow Answer

Ephemerellid mayflies under attack by stoneflies will typically

Correct AnswerverifiedShow Answer

The standard error of the mean is equal to

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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 AnswerverifiedA

The defensive tactic in which prey reduce their individual probability of being eaten by occurring at very high densities is called

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

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

Correct Answerverified"The ecology of fear"

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

Correct AnswerverifiedShow Answer

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False

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A

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"The ecology of fear"

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