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Bio112 Home Work Community Structure
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. All of the populations of different species that occupy and are adapted to a given habitat are referred to by
which term?
a. biosphere
b. community
c. ecosystem
d. niche
e. ecotone
2. Niche refers to the
a. home range of an animal.
b. preferred habitat for an organism.
c. functional role of a species in a community.
d. territory occupied by a species.
e. locale in which a species lives.
3. A relationship in which benefits flow both ways between the interacting species is
a. a neutral relationship.
b. commensalism.
c. competitive exclusion.
d. mutualism.
e. parasitism.
4. A one-way relationship in which one species benefits and directly hurts the other is called
a. commensalism.
b. competitive exclusion.
c. parasitism.
d. obligate mutualism.
e. neutral relationship.
5. The interaction in which one species benefits and the second species is neither harmed nor benefited is
a. mutualism.
b. parasitism.
c. commensalism.
d. competition.
e. predation.
6. The interaction between two species in which one species benefits and the other species is harmed is
a. mutualism.
b. commensalism.
c. competition.
d. predation.
e. none of these
7. The relationship between the yucca plant and the yucca moth that pollinates it is best described as
a. camouflage.
b. commensalism.
c. competitive exclusion.
d. mutualism.
e. all of these
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8. Competitive exclusion is the result of
a. mutualism.
b. commensalism.
c. competition.
d. predation.
e. parasitism.
9. The subdividing of some category of similar resources in a way that allows competing species to exist is
a. competition.
b. social parasitism.
c. predation.
d. mimicry.
e. resource partitioning.
10. Which of the following is an adaptation against predation?
a. thorns
b. social behavior
c. mimicry
d. thorns and social behavior
e. thorns, social behavior, and mimicry
11. Chemicals in both plants and animals serve as which of the following to predators?
a. warnings
b. repellents
c. toxins
d. bad tastes
e. all of these
12. Which of the following does NOT apply to parasitoids?
a. insects
b. kill animals on which they feed
c. host usually survives
d. smaller in size than prey
e. effective biocontrol agents
13. Which of the following is the most common interaction between species?
a. competition
b. predation
c. parasitism
d. mutualism
e. commensalism
14. A non-poisonous butterfly, which gains protection by looking like a bad-tasting butterfly, exhibits what
adaptive feature against predation?
a. competition
b. chemical defense
c. mutualism
d. mimicry
e. warning coloration
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____ 15. When populations of two different species interact over long periods of time, changes in the gene pool of one
species can lead to changes in the gene pool of the other. This is called
a. competition
b. coevolution
c. coincidence
d. commensalism
e. predation
____ 16. The weakest symbiotic attachment, in which one species simply lives better in the presence of another species
without harming it is
a. commensalism.
b. competitive exclusion.
c. mutualism.
d. facultative obligate mutualism.
e. parasitism.
____ 17. The interaction between two species in which both species may be harmed is known as
a. mutualism.
b. parasitism.
c. commensalism.
d. competition.
e. predation.
____ 18. A male wolf who is courting a female bares his teeth when a second male approaches the same female. The
second male retreats. This series of events provides an example of
a. a neutral interaction.
b. exploitation competition.
c. interference competition.
d. competitive exclusion.
e. commensalism.
____ 19. Gause's exclusion principle refers to
a. isolation.
b. competition.
c. habitat preference.
d. physiological adaptation.
e. habitat destruction.
____ 20. Competitive exclusion is based upon the idea that
a. one species will voluntarily allow the other to survive.
b. no two species can completely occupy the same niche.
c. the larger species will dominate the smaller.
d. competition is overrated as a factor in species survival.
e. two species can live together if they share the same niche but only at alternate times.
____ 21. Conditions of stable coexistence between predator and prey include
a. high predator reproductive rate relative to that of the prey.
b. a carrying capacity for prey which is not high.
c. large predator size relative to that of the prey.
d. high predator reproductive rate relative to that of the prey and a carrying capacity for prey
which is not high.
e. high predator reproductive rate relative to that of the prey, a carrying capacity for prey
which is not high, and large predator size relative to that of the prey.
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____ 22. If multiple species find themselves competing for the same resource, the competition can be reduced by which
of the following?
a. camouflage
b. cooperation
c. resource partitioning
d. resource expansion
e. mimicry
____ 23. Which of the following is not a method predators use to capture prey?
a. pursuit
b. ambush
c. camouflage
d. chemical warfare
e. protective shells
____ 24. Which of the following is not a method prey species use to avoid capture?
a. highly developed sense of sight or smell
b. spines and thorns
c. chemical warfare
d. ambush
e. camouflage
____ 25. Humans hunt the black rhinoceros, which is rapidly approaching extinction as a result of this predation. What
accounts for the absence of stable coexistence between the two species?
a. Predator and prey have not coevolved.
b. Human predation is not necessarily density-dependent.
c. The prey reproductive rate is greater than that of the predator.
d. Predator and prey have not coevolved and human predation is not necessarily
density-dependent.
e. Predator and prey have not coevolved, human predation is not necessarily
density-dependent, and the prey reproductive rate is greater than that of the predator.
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Bio112 HW 6 Community Structure
Answer Section
MULTIPLE CHOICE
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B
PTS: 1
DIF: Easy
WHICH FACTORS SHAPE COMMUNITY STRUCTURE?
C
PTS: 1
DIF: Easy
WHICH FACTORS SHAPE COMMUNITY STRUCTURE?
D
PTS: 1
DIF: Easy
WHICH FACTORS SHAPE COMMUNITY STRUCTURE?
C
PTS: 1
DIF: Easy
WHICH FACTORS SHAPE COMMUNITY STRUCTURE?
C
PTS: 1
DIF: Easy
WHICH FACTORS SHAPE COMMUNITY STRUCTURE?
D
PTS: 1
DIF: Easy
WHICH FACTORS SHAPE COMMUNITY STRUCTURE?
D
PTS: 1
DIF: Easy
MUTUALLY BENEFICIAL INTERACTIONS
C
PTS: 1
DIF: Moderate
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E
PTS: 1
DIF: Moderate
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E
PTS: 1
DIF: Moderate
PREDATOR-PREY INTERACTIONS
E
PTS: 1
DIF: Moderate
PREDATOR-PREY INTERACTIONS
C
PTS: 1
DIF: Difficult
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A
PTS: 1
DIF: Easy
TOP:
New
D
PTS: 1
DIF: Moderate
TOP:
B
PTS: 1
DIF: Easy
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A
PTS: 1
DIF: Moderate
WHICH FACTORS SHAPE COMMUNITY STRUCTURE?
D
PTS: 1
DIF: Moderate
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C
PTS: 1
DIF: Moderate
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B
PTS: 1
DIF: Moderate
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B
PTS: 1
DIF: Moderate
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D
PTS: 1
DIF: Difficult
PREDATOR-PREY INTERACTIONS
C
PTS: 1
DIF: Easy
TOP:
New
E
PTS: 1
DIF: Easy
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D
PTS: 1
DIF: Easy
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Updated
D
PTS: 1
DIF: Difficult
PREDATOR-PREY INTERACTIONS
COMPETITIVE INTERACTIONS
COMPETITIVE INTERACTIONS
PARASITES AND PARASITOIDS
5-1 How Do Species Interact?
5-1 How Do Species Interact?
5-1 How Do Species Interact?
COMPETITIVE INTERACTIONS
COMPETITIVE INTERACTIONS
COMPETITIVE INTERACTIONS
COMPETITIVE INTERACTIONS
5-1 How Do Species Interact?
5-1 How Do Species Interact?
5-1 How Do Species Interact?