Question 1

Sympatric species are

Accepted Answer

A)   more likely than allopatric species to display character displacement.
B)   always show character displacement.
C)   less likely than allopatric species to display character displacement.
D)   unlikely to be competing.
E)   more likely than allopatric species to display character displacement, less likely than allopatric species to display character displacement, and unlikely to be competing.F) A) and B)
G) All of the above

Question 2

A mutualism in each species can live without the other is termed a

Accepted Answer

A)   facultative mutualism.
B)   obligate mutualism.
C)   definite partnership.
D)   dispersive mutualism.
E)   defensive mutualism.F) B) and E)
G) A) and D)

Question 3

Similar species can coexist in a community because of

Accepted Answer

A)   resource partitioning.
B)   competitive exclusion.
C)   allopatric competition.
D)   sympatric competition.
E)   allopatric competition and sympatric competition.F) B) and D)
G) C) and E)

Question 4

Parasitic relationships tend to be highly intimate.

Accepted Answer

A) True 
 B)False

Question 5

Polyphagous parasites feed on

Accepted Answer

A)   any plant.
B)   one host.
C)   many different hosts.
D)   ectoparasites.
E)   None of the answers is correct.F) A) and B)
G) D) and E)

Question 6

Some scientists have suggested that recent outbreaks of sudden oak disease could be fought through the creation of transgenic plants with genetic resistance to sudden oak disease. What would be the source of this genetic resistance?

Accepted Answer

A)   species of aphids with resistance to sudden oak disease.
B)   newly synthesized genes inserted into plants' genomes.
C)   species with unusually high levels of host plant resistance.
D)   domesticated apple trees adapted to North America.
E)   original host species in the source region of the disease.F) A) and D)
G) A) and E)

Question 7

In Connell's experiments with the barnacles Chthamalus stellatus and Semibalanus balanoides, the potential distribution of each species is known as the

Accepted Answer

A)   competition zone.
B)   mortality rate.
C)   fundamental niche.
D)   defined mutualism.
E)   tidal boundary.F) B) and C)
G) All of the above

Question 8

Resource partitioning enables similar species to coexist in a community.

Accepted Answer

A) True 
 B)False

Question 9

Allelopathy is

Accepted Answer

A)   interference competition.
B)   the secretion of toxins into the environment by plant roots.
C)   intraspecific competition.
D)   the transmission of viruses from deer to rabbits.
E)   the movement of genes from one species to another.F) C) and E)
G) B) and D)

Question 10

Many species of ants "farm" aphids, protecting these insects and collecting concentrated sugars known as honeydew from them. The relationship between such an ant and its aphids is known as

Accepted Answer

A)   mutualism.
B)   defensive mutualism.
C)   parasitism.
D)   predation.
E)   amensalism.F) A) and B)
G) B) and E)

Question 11

Fleas are endoparasites.

Accepted Answer

A) True 
 B)False

Question 12

Caterpillars of the same species on a large leaf each chew as much leaf as they can. This is an example of

Accepted Answer

A)   amensalism.
B)   interference competition.
C)   exploitation competition.
D)   commensalism.
E)   interspecific competition.F) A) and E)
G) D) and E)

Question 13

Which of the following lack chlorophyll and are totally dependent on the host plant for water and nutrients?

Accepted Answer

A)   hemiparasites
B)   holoparasites
C)   all plant parasites
D)   root parasites
E)   hemiparasites and root parasitesF) B) and C)
G) B) and D)

Question 14

Random variation in the outcomes of competition experiments is called

Accepted Answer

A)   allelopathy.
B)   stochasticity.
C)   commensalism.
D)   competition frequency.
E)   resource partitioning.F) C) and E)
G) All of the above

Question 15

What is often true of the fruits eaten by birds and mammals?

Accepted Answer

A)   defensive mutualism.
B)   monophagy.
C)   high number of parasites.
D)   attractive colors.
E)   amensalism.F) C) and D)
G) B) and E)

Question 16

Humans exert top-down pressures on white-tail deer.

Accepted Answer

A) True 
 B)False

Question 17

The nitrogen-limitation hypothesis states that organisms select food in terms of the nitrogen content of the tissue. Why might this be true?

Accepted Answer

A)   Animal tissue contains about 10 times as much nitrogen as plant tissue.
B)   Animals are able to "fix" nitrogen much more effectively than plants.
C)   Herbivores prefer plants with lower nitrogen content.
D)   High nitrogen levels are a key part of plant chemical defenses.
E)   Plant tissue contains about 10 times as much nitrogen as animal tissue.F) B) and C)
G) A) and E)

Question 18

Using insects from the original homeland to control invasive weeds is a form of biological control.

Accepted Answer

A) True 
 B)False

Question 19

What might be the predominant lifestyle on Earth?

Accepted Answer

A)   omnivory.
B)   masting.
C)   herbivory.
D)   commensalism
E)   parasitism.F) A) and B)
G) A) and C)

Question 20

The reduction in the density of chestnut trees in North America was due to

Accepted Answer

A)   a fungal pathogen.
B)   chestnut blight.
C)   a fungal pathogen and chestnut blight.
D)   an insect.
E)   a bacteria.F) A) and B)
G) A) and E)

Exam 57: Species Interactions

Similar species can coexist in a community because of

Correct AnswerverifiedShow Answer

Caterpillars of the same species on a large leaf each chew as much leaf as they can. This is an example of

Correct AnswerverifiedShow Answer

What is often true of the fruits eaten by birds and mammals?

Correct AnswerverifiedShow Answer

Random variation in the outcomes of competition experiments is called

Correct AnswerverifiedShow Answer

Humans exert top-down pressures on white-tail deer.

Correct AnswerverifiedShow Answer

The reduction in the density of chestnut trees in North America was due to

Correct AnswerverifiedShow Answer

A mutualism in each species can live without the other is termed a

Correct AnswerverifiedShow Answer

Many species of ants "farm" aphids, protecting these insects and collecting concentrated sugars known as honeydew from them. The relationship between such an ant and its aphids is known as

Correct AnswerverifiedShow Answer

Some scientists have suggested that recent outbreaks of sudden oak disease could be fought through the creation of transgenic plants with genetic resistance to sudden oak disease. What would be the source of this genetic resistance?

Correct AnswerverifiedShow Answer

The nitrogen-limitation hypothesis states that organisms select food in terms of the nitrogen content of the tissue. Why might this be true?

Correct AnswerverifiedShow Answer

What might be the predominant lifestyle on Earth?

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Polyphagous parasites feed on

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Using insects from the original homeland to control invasive weeds is a form of biological control.

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Sympatric species are

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Which of the following lack chlorophyll and are totally dependent on the host plant for water and nutrients?

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Parasitic relationships tend to be highly intimate.

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In Connell's experiments with the barnacles Chthamalus stellatus and Semibalanus balanoides, the potential distribution of each species is known as the

Correct AnswerverifiedShow Answer

Resource partitioning enables similar species to coexist in a community.

Correct AnswerverifiedShow Answer

Fleas are endoparasites.

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Allelopathy is

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