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

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

Accepted Answer

A)  Predators
B)  Pathogens
C)  Herbivores
D)  Parasites
E)  Parasitoids

Question 3

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 4

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

Accepted Answer

A) True 
 B)False

Question 5

Calculate standard error given:  xˉ=56.2\bar { x } = 56.2xˉ=56.2  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 6

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 7

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

Accepted Answer

pathogen

Question 8

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 9

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. C

Question 10

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 11

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 12

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 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

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 15

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 16

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 17

Plagiorhynchus worms and Puccinia rusts are parasites that share the ability to change their host's behavior in way that

Accepted Answer

A)  increase the length of time they can survive in their hosts.
B)  decrease their host's mortality rates.
C)  increase their hosts reproduction,thereby increasing production of parasite-infected offspring.
D)  increase the likelihood of their (the parasites') transmission to a new host.
E)  decrease the hosts' vulnerability to other parasites.

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

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. E

Question 20

_______________________ 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...

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

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

Correct AnswerverifiedShow Answer

Periodical cicadas spend 13 or 17 years

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Calculate standard error given: xˉ=56.2\bar { x } = 56.2xˉ=56.2 mm,s = 6.2 mm,and n = 10.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answerverifiedpathogen

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

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

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

A "negatively phototaxic" amphipod will swim

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Ephemerellid mayflies under attack by stoneflies will typically

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Plagiorhynchus worms and Puccinia rusts are parasites that share the ability to change their host's behavior in way that

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

Gause's experiments with Paramecium and Didinium showed

Correct AnswerverifiedE

_______________________ 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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Calculate standard error given: $\bar { x } = 56.2$ mm,s = 6.2 mm,and n = 10.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
pathogen

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
E

Correct Answer
verified
"The ecolo...
View Answer