IBIO 182 EXAM 4: POST-COURSE
PRACTICE EXAM QUESTIONS AND
ANSWERS
f a bird song promotes an individual's ability to attract a mate and reproduce, then
the song has a(n) _____ function. - ANSWERAdaptive
Many female birds establish a pair bond with a single male with whom they build a
nest and rear young. Many of those females, however, also copulate with other
males outside the pair bond; the young they raise are fathered by more than one
male. If we want to understand how this behavior originated and how it may have
changed over time, we want to understand its: - ANSWERevolutionary history
On a research trip to the Galapogos islands you are interested in marine iguanas -
that are rather good swimmers. Two nearby islands (approximately 500 yards apart)
have marine iguanas on them. These two islands of iguanas likely represent: -
ANSWEROne population
(Based on food web from question 17) The graph right depicts hawk population size
between the years 2004 - 2009. Given this data, how would you predict the
populations of other organisms in this food web would be impacted? See table below
for answer choices.
Choose ONE column (A-D) that best matches the most plausible outcome in terms
of changes in the population sizes of various organisms in this food web. Select only
ONE answer choice. - ANSWERA. Rabbit increase, lizard increase, roadrunner
increase
In many high elevation lakes in the western United States, large fish are completely
absent. In some of these lakes, trout and other non-native fish have been stocked so
humans can fish them recreationally. Some biologists are concerned that the trout
might be having a negative impact on an endangered frog species that lives in the
lakes. When these frogs are young tadpoles, they feed on algae at the surface of the
water were they are most exposed and susceptible to predators. To avoid being
eaten, some tadpoles exhibit "timid" behavior, spending more time hiding than
feeding. Tadpoles exhibiting more "bold" behavior hide less and obtain more food in
lakes without fish. However, in lakes with trout, they are much more likely to be
eaten by the fish predators. Biologists hypothesize that timid behavior is an
adaptation in lakes that contain non-native trout.
Ten years after trout have been introduced into lakes, resea - ANSWERbold or timid
behaviors are determined by genes
Overlap of niches can be minimized through: - ANSWERresource partitioning
, The graph right depicts population growth of organisms under contrasting
assumptions. The population growth models under both assumptions are indicated
by two lines, line A and line B (labeled in the figure). The dotted line represents the
carrying capacity.
A plausible explanation of why the two lines are similar at the point indicated by the
large arrow that says "Here" on the figure would be: Select only ONE answer choice.
- ANSWERat that time point, the two populations are not resource limited
The graph on the right shows that the number of organisms in an isolated population
over time. In which part of the curve is the death rate and emigration rate equal to
the birth rate and immigration rate, respectively? Select only ONE answer choice. -
ANSWERIII (The top of the parabola)
Given the graph depicted on the right, in which region of the population growth curve
is the death rate likely exceeding the birth rate? - ANSWERLocation C (the
decreasing point on graph)
Given the relationship demonstrated in the graph right, where is this population likely
to be in their growth curve (growth curve below, has labels A, B and C on it). -
ANSWERLocation A (the increasing point on the graph)
You are studying a population of vultures in Ohio. While in the field, over time you
observe an increase in the degree of intraspecific competition for resources.
Additionally, as time progresses, you observe that some individuals become
susceptible to certain diseases that typically occur in populations at high densities.
Lastly, during your time studying this population you do not observe any natural
disasters or major weather events in the area. Based on this information, which line
in the graph to the right best represents the patterns of growth of the population of
vultures to date? - ANSWERLine C (the logistic curve)
From Question 6 graph above, but ignore the prompt in question 6)
What does Line C represent in the graph in question 6? - ANSWERLogistic
population growth
You are working with local conservation agencies to monitor a key population of Gila
monsters living in the Sonoran Desert (pictured right). Previous studies estimate that
the typical carrying capacity of Gila monster populations is 50 individuals. You
estimate the population size of Gila monsters in this area to be 25 individuals in
2009. Based on your research, you discover that Gila monster populations typically
have a per capita growth rate of 0.25. Based on this information, estimate the
number of Gila monsters in the population in the year 2010. If your calculation has
decimals, round up if your decimal is 0.5 or larger, round down if your decimal is
below 0.5. Select only ONE answer choice. - ANSWER2010=28
In the logistic growth model, if N = K, then there will be no change in population size
over time. (Note - for this question only consider the mathematical equation, not a
real population) - ANSWERTrue
You recently discovered some interesting data online while searching for information
about the population growth of various countries. You notice that the population size
PRACTICE EXAM QUESTIONS AND
ANSWERS
f a bird song promotes an individual's ability to attract a mate and reproduce, then
the song has a(n) _____ function. - ANSWERAdaptive
Many female birds establish a pair bond with a single male with whom they build a
nest and rear young. Many of those females, however, also copulate with other
males outside the pair bond; the young they raise are fathered by more than one
male. If we want to understand how this behavior originated and how it may have
changed over time, we want to understand its: - ANSWERevolutionary history
On a research trip to the Galapogos islands you are interested in marine iguanas -
that are rather good swimmers. Two nearby islands (approximately 500 yards apart)
have marine iguanas on them. These two islands of iguanas likely represent: -
ANSWEROne population
(Based on food web from question 17) The graph right depicts hawk population size
between the years 2004 - 2009. Given this data, how would you predict the
populations of other organisms in this food web would be impacted? See table below
for answer choices.
Choose ONE column (A-D) that best matches the most plausible outcome in terms
of changes in the population sizes of various organisms in this food web. Select only
ONE answer choice. - ANSWERA. Rabbit increase, lizard increase, roadrunner
increase
In many high elevation lakes in the western United States, large fish are completely
absent. In some of these lakes, trout and other non-native fish have been stocked so
humans can fish them recreationally. Some biologists are concerned that the trout
might be having a negative impact on an endangered frog species that lives in the
lakes. When these frogs are young tadpoles, they feed on algae at the surface of the
water were they are most exposed and susceptible to predators. To avoid being
eaten, some tadpoles exhibit "timid" behavior, spending more time hiding than
feeding. Tadpoles exhibiting more "bold" behavior hide less and obtain more food in
lakes without fish. However, in lakes with trout, they are much more likely to be
eaten by the fish predators. Biologists hypothesize that timid behavior is an
adaptation in lakes that contain non-native trout.
Ten years after trout have been introduced into lakes, resea - ANSWERbold or timid
behaviors are determined by genes
Overlap of niches can be minimized through: - ANSWERresource partitioning
, The graph right depicts population growth of organisms under contrasting
assumptions. The population growth models under both assumptions are indicated
by two lines, line A and line B (labeled in the figure). The dotted line represents the
carrying capacity.
A plausible explanation of why the two lines are similar at the point indicated by the
large arrow that says "Here" on the figure would be: Select only ONE answer choice.
- ANSWERat that time point, the two populations are not resource limited
The graph on the right shows that the number of organisms in an isolated population
over time. In which part of the curve is the death rate and emigration rate equal to
the birth rate and immigration rate, respectively? Select only ONE answer choice. -
ANSWERIII (The top of the parabola)
Given the graph depicted on the right, in which region of the population growth curve
is the death rate likely exceeding the birth rate? - ANSWERLocation C (the
decreasing point on graph)
Given the relationship demonstrated in the graph right, where is this population likely
to be in their growth curve (growth curve below, has labels A, B and C on it). -
ANSWERLocation A (the increasing point on the graph)
You are studying a population of vultures in Ohio. While in the field, over time you
observe an increase in the degree of intraspecific competition for resources.
Additionally, as time progresses, you observe that some individuals become
susceptible to certain diseases that typically occur in populations at high densities.
Lastly, during your time studying this population you do not observe any natural
disasters or major weather events in the area. Based on this information, which line
in the graph to the right best represents the patterns of growth of the population of
vultures to date? - ANSWERLine C (the logistic curve)
From Question 6 graph above, but ignore the prompt in question 6)
What does Line C represent in the graph in question 6? - ANSWERLogistic
population growth
You are working with local conservation agencies to monitor a key population of Gila
monsters living in the Sonoran Desert (pictured right). Previous studies estimate that
the typical carrying capacity of Gila monster populations is 50 individuals. You
estimate the population size of Gila monsters in this area to be 25 individuals in
2009. Based on your research, you discover that Gila monster populations typically
have a per capita growth rate of 0.25. Based on this information, estimate the
number of Gila monsters in the population in the year 2010. If your calculation has
decimals, round up if your decimal is 0.5 or larger, round down if your decimal is
below 0.5. Select only ONE answer choice. - ANSWER2010=28
In the logistic growth model, if N = K, then there will be no change in population size
over time. (Note - for this question only consider the mathematical equation, not a
real population) - ANSWERTrue
You recently discovered some interesting data online while searching for information
about the population growth of various countries. You notice that the population size
