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WorksheetsPopulation Ecology Test Review
Total questions: 29
Worksheet time: 16mins
Name
Class
Date
1.
A population is correctly defined as having which of the following characteristics?
I. inhabiting the same general area
II. individuals belonging to the same species
III. possessing a constant and uniform density and dispersion
I. inhabiting the same general area
II. individuals belonging to the same species
III. possessing a constant and uniform density and dispersion
a)
I only
b)
III only
c)
I &11 Only
d)
II &III only
2.
An ecologist recorded 12 white-tailed deer, Odocoileus virginianus, per square mile in one woodlot and 20 per square mile on another woodlot. What was the ecologist comparing?
a)
density
b)
dispersion
c)
carrying capacity
d)
quardrats
3.
During the spring, you are studying the mice that live in a field near your home. There are lots of mice in this field, but you realize that you rarely observe any reproductive females. This most likely indicates
a)
a.
that there is selective predation
on female mice.
b)
that female mice die before reproduction
c)
that this habitat is a good place for the mice to reproduce
d)
that you are observing
immigrant mice.
4.
To measure the population density of monarch butterflies occupying a particular park, 100 butterflies are captured, marked with a small dot on a wing, and then released. The next day, another 100 butterflies are captured, including the recapture of 20 marked butterflies. One would estimate the population to be
a)
200
b)
500
c)
1,000
d)
10,000
5.
You are observing a population of lizards when you notice that the number of adults has increased and is higher than previously observed. One explanation for such an observation would include
a)
reduction in death rate
b)
increased immigration
c)
decreased emigration
d)
decreased emigration
6.
The most common kind of dispersion in nature is
a)
clumped
b)
uniform
c)
random
d)
inderminate
7.
Uniform spacing patterns in plants such as the creosote bush are most often associated with
a)
chance
b)
patterns of high humidity.
c)
competitive interactions among individuals in the
population
d)
the random distribution of seeds
8.
Which of the following groups would be most likely to exhibit uniform dispersion?
a)
red squirrels, who actively defend territories
b)
cattails, which grow primarily at edges of lakes and
streams
c)
dwarf mistletoes, which parasitize particular species
of forest tree
d)
moths in a city at night
9.
A table listing such items as age, observed number of organisms alive each year, and life expectancy is known as a (an)
a)
motality table
b)
life table
c)
survivorship table
d)
rate table
10.
Life tables are most useful in determining which of the following?
a)
carrying capacity
b)
the fate of a cohort of newborn organisms throughout their lives
c)
immigration and emigration rates
d)
population dispersion patterns
11.
To measure the population of lake trout in a 250 hectare lake, 200 individuals were netted and marked with a fin clip, and then returned to the lake. The next week, the lake is netted again, and out of the 200 lake trout that are caught, 50 have fin clips. Using the capture-recapture estimate, the lake trout population size could be closest to which of the following?
a)
200
b)
250
c)
800
d)
400
12.
Demography is the study of
a)
the vital statistics of populations and how they
change over time
b)
death and emigration rates of a population at any
moment in time
c)
the survival patterns of a population.
d)
life expectancy of individuals within a population.
13.
Natural selection has led to the evolution of diverse natural history strategies, which have in common
a)
many offspring per reproductive episode.
b)
limitation only by density-independent limiting factors.
c)
adaptation to stable environments.
d)
maximum lifetime reproductive success.
14.
A population of ground squirrels has an annual per capita birth rate of 0.06 and an annual per capita death rate of 0.02. Estimate the number of individuals added to (or lost from) a population of 1,000 individuals in one year.
a)
.
120 individuals added
b)
40 individuals added
c)
20 individuals added
d)
400 individuals added
15.
A small population of white-footed mice has the same intrinsic rate of increase (r) as a large population. If everything else is equal,
a)
the large population will add more individuals per
unit time.
b)
the small population will
add more individuals per unit time.
c)
the two populations will add
equal numbers of individuals per unit time.
d)
d.
the J-shaped growth curves
will look identical.
16.
In the logistic equation , r is a measure of the population's intrinsic rate of increase. It is determined by which of the following?
a)
birth rate and death rate
b)
carrying capacity
c)
dispersion
d)
density
17.
In 2005, the United States had a population of approximately 295,000,000 people. If the birth rate was 13 births for every 1,000 people, approximately how many births occurred in the United States in 2005?
a)
3,800
b)
38,000
c)
380,000
d)
3,800,000
18.
In 2005, the United States had a population of approximately 295,000,000 people. If the birth rate was 13 births for every 1,000 people, approximately how many births occurred in the United States in 2005?
a)
3,800
b)
38,000
c)
380,000
d)
3,800,000
19.
Often the growth cycle of one population has an effect on the cycle of another. As moose populations increase, wolf populations also increase. Thus, if we are considering the logistic equation for the wolf population, , which of the factors accounts for the effect on the moose population?
a)
N
b)
r
c)
rN
d)
K
20.
Which of the following might be expected in the logistic model of population growth?
a)
As N approaches K,
b increases.
b)
As N approaches K, r increases
c)
As N approaches K, d increases.
d)
both b and r increase
21.
In models of logistic population growth,
a)
population growth rate slows dramatically as N
approaches K.
b)
new individuals are added to the population most
rapidly at the beginning of the population's growth.
c)
only density-dependent factors affect the rate of
population growth.
d)
only density-independent
factors affect the rate of population growth.
22.
Density-dependent factors are related to which of the following?
a)
iteroparous
iteroparous
b)
dispersion
c)
cohort
d)
Alee efect
23.
Which of the following is true?
a)
K-selection operates in populations where populations fluctuate well below the carrying capacity
b)
r-selection occurs in populations whose densities are very near the carrying capacity.
c)
r- and K-selection are two extremes of a range of life history strategies.
d)
c.
Different populations of the
same species will be consistently r- or K-selected.
24.
Which of the following characterizes relatively K-selected populations?
a)
offspring with good chances of survival
b)
many offspring per reproductive episode
c)
small offspring
d)
a high intrinsic rate of increase
25.
Which of the following statements about the evolution of life histories is correct?
a)
Stable environments with limited resources favor r-selected populations.
b)
b. K-selected populations are most often found in environments where density-independent factors are important regulators of population size.
c)
c. Most populations have both r- and K-selected characteristics that vary under different environmental conditions.
d)
The reproductive efforts of r-selected populations are directed at producing just a few offspring with good competitive abilities.
26.
Your friend comes to you with a problem. It seems his shrimp boats aren't catching nearly as much shrimp as they used to. He can't understand why because originally he caught all the shrimp he could handle. Each year he added a new boat, and for a long time each boat caught tons of shrimp. As he added more boats, there came a time when each boat caught somewhat fewer shrimp, and now, each boat is catching a lot less shrimp. Which of the following topics might help your friend understand the source of his problem?
a)
density-dependent population regulation and intrinsic characteristics of population growth
b)
exponential growth curves and unlimited environmental resources
c)
density-independent population regulation and chance occurrence
d)
pollution effects of a natural environment and learned shrimp behavior
27.
Carrying capacity is
a)
seldom reached by marine producers and consumers
because of the vast resources of the ocean.
b)
the maximum population size that a particular
environment can support.
c)
fixed for most species over most of their range most
of the time.
d)
determined by density and dispersion data.
28.
Which of the following can contribute to density-dependent regulation of populations?
a)
the removal of toxic waste by decomposers
b)
intraspecific competition for nutrients
c)
earthquakes
d)
floods
29.
Which of the following is a density-independent factor limiting human population growth?
a)
social pressure for birth control
b)
earthquake
c)
plagues
d)
famines
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