Download Quiz 6 Fall break is this weekend!

Quiz 6
Fall break is this weekend!
Question 1
A population of turtles contained 342 individuals at
the end of the year 2010. Since then, 44 have
died, 37 were born, 17 immigrated, and 6
emigrated. What is the population size now?
a. 298
b. 335
c. 338
d. 346
e. 353
Question 2
Although there are approximately 10,000 cheetahs left in
the wild, biologists think that their numbers were
much lower at some time in the past because cheetah
populations have very little genetic variation. What is
the most likely reason for the lack of genetic variability
in cheetahs?
a. Environmental stochasticity
b. Demographic stochasticity
c. Genetic stochasticity
d. Genetic drift
e. Isolation by distance
Question 3
How did Brewer manipulate the level of
competition in his experiment on pitcher plants?
a. By adding noncarnivorous competitor species
b. By weeding and clipping noncarnivorous
competitor species
c. By adding ants
d. By removing ants
e. None of the above; Brewer did not perform a
manipulative study.
Question 4
Black walnut trees release juglone and other
chemicals that can be toxic to other plants. This
phenomenon may be an example of _______,
although experimental confirmation is still
needed.
a. isoclines
b. exploitative competition
c. allelopathy
d. character displacement
e. chthamalus
Question 5
If seed-eating rodents and ants eat the same sized
seeds, what would you predict? The number of
rodents _______ when ants were removed and
the number of ant colonies _______ when
rodents were removed.
a. increased; increased
b. increased; decreased
c. stayed the same; stayed the same
d. decreased; increased
e. decreased; decreased
Question 6
Which of the following statements about Patterson’s study of
the distributions of Neotanias chipmunks in the
southwestern United States is false?
a. It found that in mountain ranges where two species were
present, the overlap of their distributions was small.
b. It found that in mountain ranges where only one species
was present, that species was found over a broader
distribution of habitats than would have been possible in
the presence of a competitor.
c. They were manipulative experiments.
d. They suggested that competition is limiting the ranges of
the species.
e. All of the above are true; none is false.
Question 7
Suppose that two species of mice live on the same
island and eat seeds, but one species tends to eat
larger seeds than the other one does. Based on
this observation, we can conclude that these
species are engaged in
a. character displacement.
b. allelopathy.
c. jump dispersal.
d. competitive exclusion.
e. resource partitioning.
Question 8
Based on Paine’s studies, what has allowed the sea
palm to persist in shoreline areas despite the
presence of a superior competitor (Mytilus)?
a. Allelopathy by the sea palm
b. Character displacement
c. Competitive exclusion
d. Periodic disturbances
e. Both a and b
Question 9
Character displacement is likely to _______ the
competition coefficients in two competing
species and to _______ resource partitioning.
a. increase; increase
b. increase; lower
c. increase; eliminate
d. lower; increase
e. lower; lower
Question 10
Moths resting on the trunks of trees often resemble
the tree bark such that potential predators do not
perceive them as prey. This is an example of
a. an induced defense.
b. aposematic coloration.
c. silencing.
d. crypsis.
e. None of the above