EXAM 3 PREP BIO 182 QUESTIONS
AND ANSWERS
Population - Correct Answers -A group of individuals of the same species that live in a
given area
Which group is not a population? (see image) - Correct Answers -All groups could be
considered populations.
How would you estimate the number of whales in a population? - Correct Answers -2
ways to estimate the size of a population:
Sampling Quadrats: Count individuals in a few small areas and extrapolate to the whole
area
Mark and recapture: Capture, mark, and release individuals; then resample and use
proportion of marked individuals to infer the total population (# marked at time 1 /
population size= # marked at time 2 /total captured at time 2)
True or False? Sampling quadrats would be the better method for estimating the
number of whales in a population. - Correct Answers -False, the better way to estimate
the number of whales in a population would be to mark and recapture because it would
be more accurate.
True or False? Mark and recapture would be the better method for estimating the
number of saguaros in a population. - Correct Answers -False, saguaros don't move, so
you are better off using sampling quadrats.
key point - Correct Answers -Population sizes are estimated with models, which require
certain assumptions.
-We never actually know what they are, unless the populations are incredibly small
,What processes determine a population's growth? - Correct Answers -growth= births -
deaths + immigrants - emigrants
=change of the number if individuals
True or False? The shrinking population between 1965 and 1970 could have resulted
from a decrease in the birth rate or an increase in the death rate. - Correct Answers -
True, both a decrease in the birth rate or an increase in the death rate are possible.
True or False? The growing population between 1985 and 1995 could have resulted
from a decrease in emigration or an increase in immigration. - Correct Answers -True,
both a decrease in emigration or an increase in immigration are possible.
key point - Correct Answers -Populations grow when births and immigrants exceed
deaths and emigrants.
-Any population that's growing must be growing
1. The human population has grown ____________________
a. linearly.
b. exponentially.
c. sigmoidally
d. stochastically.
2. The growth of a population depends on __________________
a. the birth rate.
b. the death rate.
c. the birth rate plus the death rate.
d. the birth rate minus the death rate.
3. A population stops growing when it _____________________
a. reaches its carrying capacity.
b. doubles in size.
c. runs out of resources.
d. interacts with other populations.
4. True or False? The carrying capacity of a population depends on the resources
available in the environment.
a. True
b. False - Correct Answers -1. exponentially.
2. the birth rate minus the death rate.
, 3. reaching its carrying capacity.
4. True
Why do bluegills nest on the edge of the lake? - Correct Answers -It is warmer in these
areas, because its shallow water, it will speed the growth of the offspring.
Write a figure legend. (see image) - Correct Answers -In an experiment of the
preference of water temperature for bluegills, when given a choice between 27 and 34
degrees Celsius, Bluegills spent the majority of their time at 31 degrees Celsius.
True or False? If males compete for space, a large male will likely force a small male to
spend less time on the side of the tank with the optimal temperature. - Correct Answers
-True, if males are competing for space, the large males will push the smaller ones out
of their desired space.
key point - Correct Answers -Organisms compete for limited resources, in the case of
the bluegills it is space with a certain temperature.
True or False? Both models assume that no individuals immigrate into the population. -
Correct Answers -False, the assumptions of logistic model is:
1) All individuals survive and reproduce equally.
2) Immigration equals emigration.
3) Birth and death rates remains constant and it ends up being exponentially.
A juvenile bluegill was placed in a tank with two compartments, where one compartment
was warmer than the other. A researcher recorded the percentage of time that the fish
spent in each compartment. The test was repeated several times with different water
temperatures in each compartment. In this way, the researcher could determine which
temperatures the fish preferred and which temperatures the fish considered too cold or
too hot. The entire study was then repeated by placing two fish in the tank: the juvenile
and an adult. The figure below shows the results of these tests—the small bluegill alone
(top panels) and the small bluegill with an adult bluegill (bottom panels).
AND ANSWERS
Population - Correct Answers -A group of individuals of the same species that live in a
given area
Which group is not a population? (see image) - Correct Answers -All groups could be
considered populations.
How would you estimate the number of whales in a population? - Correct Answers -2
ways to estimate the size of a population:
Sampling Quadrats: Count individuals in a few small areas and extrapolate to the whole
area
Mark and recapture: Capture, mark, and release individuals; then resample and use
proportion of marked individuals to infer the total population (# marked at time 1 /
population size= # marked at time 2 /total captured at time 2)
True or False? Sampling quadrats would be the better method for estimating the
number of whales in a population. - Correct Answers -False, the better way to estimate
the number of whales in a population would be to mark and recapture because it would
be more accurate.
True or False? Mark and recapture would be the better method for estimating the
number of saguaros in a population. - Correct Answers -False, saguaros don't move, so
you are better off using sampling quadrats.
key point - Correct Answers -Population sizes are estimated with models, which require
certain assumptions.
-We never actually know what they are, unless the populations are incredibly small
,What processes determine a population's growth? - Correct Answers -growth= births -
deaths + immigrants - emigrants
=change of the number if individuals
True or False? The shrinking population between 1965 and 1970 could have resulted
from a decrease in the birth rate or an increase in the death rate. - Correct Answers -
True, both a decrease in the birth rate or an increase in the death rate are possible.
True or False? The growing population between 1985 and 1995 could have resulted
from a decrease in emigration or an increase in immigration. - Correct Answers -True,
both a decrease in emigration or an increase in immigration are possible.
key point - Correct Answers -Populations grow when births and immigrants exceed
deaths and emigrants.
-Any population that's growing must be growing
1. The human population has grown ____________________
a. linearly.
b. exponentially.
c. sigmoidally
d. stochastically.
2. The growth of a population depends on __________________
a. the birth rate.
b. the death rate.
c. the birth rate plus the death rate.
d. the birth rate minus the death rate.
3. A population stops growing when it _____________________
a. reaches its carrying capacity.
b. doubles in size.
c. runs out of resources.
d. interacts with other populations.
4. True or False? The carrying capacity of a population depends on the resources
available in the environment.
a. True
b. False - Correct Answers -1. exponentially.
2. the birth rate minus the death rate.
, 3. reaching its carrying capacity.
4. True
Why do bluegills nest on the edge of the lake? - Correct Answers -It is warmer in these
areas, because its shallow water, it will speed the growth of the offspring.
Write a figure legend. (see image) - Correct Answers -In an experiment of the
preference of water temperature for bluegills, when given a choice between 27 and 34
degrees Celsius, Bluegills spent the majority of their time at 31 degrees Celsius.
True or False? If males compete for space, a large male will likely force a small male to
spend less time on the side of the tank with the optimal temperature. - Correct Answers
-True, if males are competing for space, the large males will push the smaller ones out
of their desired space.
key point - Correct Answers -Organisms compete for limited resources, in the case of
the bluegills it is space with a certain temperature.
True or False? Both models assume that no individuals immigrate into the population. -
Correct Answers -False, the assumptions of logistic model is:
1) All individuals survive and reproduce equally.
2) Immigration equals emigration.
3) Birth and death rates remains constant and it ends up being exponentially.
A juvenile bluegill was placed in a tank with two compartments, where one compartment
was warmer than the other. A researcher recorded the percentage of time that the fish
spent in each compartment. The test was repeated several times with different water
temperatures in each compartment. In this way, the researcher could determine which
temperatures the fish preferred and which temperatures the fish considered too cold or
too hot. The entire study was then repeated by placing two fish in the tank: the juvenile
and an adult. The figure below shows the results of these tests—the small bluegill alone
(top panels) and the small bluegill with an adult bluegill (bottom panels).
