Question 1

In a population with low death rates, this age structure diagram indicates that

Accepted Answer

A)   the population is decreasing.
B)   the population is stable.
C)   the biotic potential must be larger than usual.
D)   the population will continue to grow for some time.E) B) and D)
F) All of the above

Question 2

From the perspective of population growth, what three major age groups does a population contain? Draw three age-structure diagrams that roughly depict the proportion of these three age groups in an increasing population, a stable population, and a decreasing population.

Accepted Answer

The three age groups are those...

Question 3

Intrinsic factors, such as behavior and physiology, may affect growth rates of a population.

Accepted Answer

A) True 
 B)False

Question 4

Farmers sprayed leechi trees to suppress populations of scale insects. This also killed the populations of a predatory lacewing that controlled the numbers of scales. Soon the spraying did no good, and the damage to the leechi from the scales was greater than before spraying had occurred. Few predatory lacewings exist in the trees now because

Accepted Answer

A)   they, too, are insects so they are r-selected.
B)   the scale insect was K-selected and the high number of young included a resistant strain, while the predator was r-selected and will take longer to produce a resistant variety.
C)   the predator was r-selected and was therefore more susceptible to the spray.
D)   the scale insect was r-selected and the high number of young included a resistant strain; the predator was K-selected and will take longer to produce a resistant variety.E) B) and C)
F) None of the above

Question 5

A pond represents a(n)  _______ while the minnows represent a(n)  ______.

Accepted Answer

A)   population; community
B)   population; ecosystem
C)   ecosystem; population
D)   community; population
E)   ecosystem; communityF) A) and B)
G) A) and C)

Question 6

Early this spring researchers have recently discovered that there is one small remnant population of endangered bluegrass left in a small prairie plot outside of Kansas City. If there are approximately 850 individuals in the cohort, how many individuals can the researchers expect to find alive at the end of the summer, 6 months later?

Accepted Answer

A)   Approximately 1000
B)   Approximately 330
C)   Approximately 700
D)   Approximately 45
E)   None of the individuals will be alive 6 months later.F) A) and E)
G) B) and D)

Question 7

As the carrying capacity of an environment is approached by a population,

Accepted Answer

A)   births begin to exceed deaths.
B)   deaths begin to exceed births.
C)   the rate of reproduction increases.
D)   population growth begins to be exponential.
E)   density-dependent environmental resistance increases.F) A) and B)
G) B) and E)

Question 8

Identify the distribution patterns of the desert shrubs in each picture.

Accepted Answer

A. clumped...

Question 9

The deceleration phase of growth always precedes the stable equilibrium phase in exponential growth.

Accepted Answer

A) True 
 B)False

Question 10

Most species are intermediate between r-strategists and K-strategists, and tend to have a type II survivorship curve.

Accepted Answer

A) True 
 B)False

Question 11

The maximum rate of natural increase of a population that occurs under ideal conditions is the

Accepted Answer

A)   population growth.
B)   biotic potential.
C)   environmental resistance.
D)   carrying capacity.
E)   density-independent population.F) C) and E)
G) None of the above

Question 12

Dandelions and tent caterpillars, which are r-strategists, are examples of opportunistic species that tend to move in high numbers and rapidly occupy new environments.

Accepted Answer

A) True 
 B)False

Question 13

The population growth rate is negative when

Accepted Answer

A)   birthrate is greater than death rate.
B)   death rate is greater than birth rate.
C)   all couples are married but average fewer than two children apiece.
D)   a country becomes poorer, because it is related to economic growth.
E)   better health care reduces the death rate and increases survivorship of newborns.F) B) and D)
G) C) and D)

Exam 44: Population Ecology

From the perspective of population growth, what three major age groups does a population contain? Draw three age-structure diagrams that roughly depict the proportion of these three age groups in an increasing population, a stable population, and a decreasing population.

Correct Answer
verified
The three age groups are those...
View Answer

Identify the distribution patterns of the desert shrubs in each picture.

Correct Answer
verified
A. clumped...
View Answer

A pond represents a(n) _ while the minnows represent a(n) .

Correct Answer
verified

As the carrying capacity of an environment is approached by a population,

Correct Answer
verified

Correct Answer
verified

Most species are intermediate between r-strategists and K-strategists, and tend to have a type II survivorship curve.

Correct Answer
verified

Intrinsic factors, such as behavior and physiology, may affect growth rates of a population.

Correct Answer
verified

Dandelions and tent caterpillars, which are r-strategists, are examples of opportunistic species that tend to move in high numbers and rapidly occupy new environments.

Correct Answer
verified

The population growth rate is negative when

Correct Answer
verified

The deceleration phase of growth always precedes the stable equilibrium phase in exponential growth.

Correct Answer
verified

Correct Answer
verified

In a population with low death rates, this age structure diagram indicates that

Correct Answer
verified

The maximum rate of natural increase of a population that occurs under ideal conditions is the

Correct Answer
verified

Exam 44: Population Ecology

From the perspective of population growth, what three major age groups does a population contain? Draw three age-structure diagrams that roughly depict the proportion of these three age groups in an increasing population, a stable population, and a decreasing population.

Correct AnswerverifiedThe three age groups are those...View AnswerShow Answer

Identify the distribution patterns of the desert shrubs in each picture.

Correct AnswerverifiedA. clumped...View AnswerShow Answer

A pond represents a(n) _______ while the minnows represent a(n) ______.

Correct AnswerverifiedShow Answer

As the carrying capacity of an environment is approached by a population,

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Most species are intermediate between r-strategists and K-strategists, and tend to have a type II survivorship curve.

Correct AnswerverifiedShow Answer

Intrinsic factors, such as behavior and physiology, may affect growth rates of a population.

Correct AnswerverifiedShow Answer

Dandelions and tent caterpillars, which are r-strategists, are examples of opportunistic species that tend to move in high numbers and rapidly occupy new environments.

Correct AnswerverifiedShow Answer

The population growth rate is negative when

Correct AnswerverifiedShow Answer

The deceleration phase of growth always precedes the stable equilibrium phase in exponential growth.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In a population with low death rates, this age structure diagram indicates that

Correct AnswerverifiedShow Answer

The maximum rate of natural increase of a population that occurs under ideal conditions is the

Correct AnswerverifiedShow Answer

Correct Answer
verified
The three age groups are those...
View Answer

Correct Answer
verified
A. clumped...
View Answer

A pond represents a(n) _ while the minnows represent a(n) .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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