Question 1

A population size will remain stable if

Accepted Answer

A)   the birth and death rates are equal, as are the rates of emigration and immigration.
B)   environmental resistance declines each year.
C)   the population grows by a fixed percentage of its size each year.
D)   the rate of emigration is higher than the rate of immigration.
E)   the number of births each year is constant and the birth rate is higher than the death rate.

Question 2

When mosquitoes are abundant, purple martins flock to the area and feed exclusively on them. When mosquito populations are not large, purple martins are similarly scarce and feed on other insects. This is an example of

Accepted Answer

A)   community carrying capacity.
B)   ecosystem carrying capacity.
C)   exotic regulation.
D)   density-independent regulation.
E)   density-dependent regulation. E

Question 3

In countries that have large numbers of children under age 15, the population is

Accepted Answer

A)   staying the same.
B)   able to expand its carrying capacity.
C)   becoming smaller.
D)   becoming larger.
E)   hard to predict.

Question 4

Based on the data in the table, this population has a_________ growth pattern.

Accepted Answer

A)   boom-and-bust
B)   J-curve
C)   replacement-level fertility
D)   S-curve
E)   scramble competition

Question 5

Predation is considered a density-dependent factor that controls the population size of prey species. Give two examples of predators acting in density-dependent ways in response to fluctuations in the size of prey populations.

Accepted Answer

Predators may adjust the number of prey ...

Question 6

What factors determine Earthʹs carrying capacity for humans?

Accepted Answer

Human carrying capacity is det...

Question 7

An insect population grows exponentially until an early winter freeze kills almost all of the insects. The next spring, the population grows exponentially again. This type of population growth is called

Accepted Answer

A)   S-curve growth.
B)   density-dependent growth.
C)   density-independent growth.
D)   boom-and-bust cycles.
E)   sustained cycling.

Question 8

What is the term for regular population cycles of rapid growth followed by massive die-off?

Accepted Answer

boom-and-bust cycles

Question 9

Write an equation that describes a situation in which a population remains stable.

Accepted Answer

Birth + immigration = death + ...

Question 10

Which species has the highest biotic potential?

Accepted Answer

A)   An elephant that produces a single calf every 3 years
B)   A fungus that produces thousands of reproductive spores every day
C)   A lioness that produces three cubs once a year
D)   A rat that produces a litter of six pups every 3 months
E)   A bacteria that divides only once every 3 weeks B

Question 11

A small country begins to experience stable economic prosperity after centuries of extreme poverty. The government uses the taxes generated for educating all members of the population and creating a comprehensive health care system for all of its citizens. A social security system is established to support elderly members of the population. What demographic changes would you expect to see?

Accepted Answer

A)   No changes in the population
B)   Large numbers of elderly people and no children
C)   A decrease in the number of deaths and an increase in the number of births and delayed childbearing
D)   Reproductive rates far below replacement-level fertility
E)   Earlier childbearing and many more children per woman, with a decrease in the number of elderly people

Question 12

All members of a species that reside within an ecosystem make up a(n)

Accepted Answer

A)   trophic level.
B)   ecotone.
C)   population.
D)   aggregation.
E)   community.

Question 13

Increased population densities and increased competition lead to increased emigration.

Accepted Answer

A) True 
 B)False

Question 14

Why do many non-native species, such as a prickly pear cactus brought to Australia from South America, rapidly become abundant when first introduced?

Accepted Answer

A)   There are fewer predators and parasites capable of attacking the non -native species in the new site.
B)   Non-native species increase their reproductive rate when introduced.
C)   Growth changes from an S-curve to a J-curve at the new site.
D)   The carrying capacity at the new site is higher than that at the native site.
E)   The climate in the new site is more favorable than in its native site.

Question 15

According to the equation for population growth rate, if two populations have the same death rates, then the population with r = 2 will increase more rapidly than a population with r = 4.

Accepted Answer

A) True 
 B)False

Question 16

The population shown in the pyramid is

Accepted Answer

A)   going through a boom-and-bust cycle.
B)   stable, or slowly growing.
C)   decreasing.
D)   expanding.
E)   showing continuous exponential growth.

Question 17

How do interspecific and intraspecific competition differ?

Accepted Answer

Interspecific competition occu...

Question 18

Based on its population pyramid, this population

Accepted Answer

A)   has reached its carrying capacity.
B)   is showing negative growth.
C)   is in a boom-and-bust cycle.
D)   is remaining the same.
E)   is expanding, or rapidly growing.

Question 19

Interspecific competition is a density-independent factor.

Accepted Answer

A) True 
 B)False

Question 20

Invasive species can rapidly disrupt an ecosystem because they have a high biotic potential and face little environmental resistance.

Accepted Answer

A) True 
 B)False

Exam 27: Population Growth and Regulation

A population size will remain stable if

Correct Answer
verified

When mosquitoes are abundant, purple martins flock to the area and feed exclusively on them. When mosquito populations are not large, purple martins are similarly scarce and feed on other insects. This is an example of

Correct Answer
verified
E

In countries that have large numbers of children under age 15, the population is

Correct Answer
verified

Based on the data in the table, this population has a_________ growth pattern.

Correct Answer
verified

Predation is considered a density-dependent factor that controls the population size of prey species. Give two examples of predators acting in density-dependent ways in response to fluctuations in the size of prey populations.

Correct Answer
verified
Predators may adjust the number of prey ...
View Answer

What factors determine Earthʹs carrying capacity for humans?

Correct Answer
verified
Human carrying capacity is det...
View Answer

An insect population grows exponentially until an early winter freeze kills almost all of the insects. The next spring, the population grows exponentially again. This type of population growth is called

Correct Answer
verified

What is the term for regular population cycles of rapid growth followed by massive die-off?

Correct Answer
verified
boom-and-bust cycles

Write an equation that describes a situation in which a population remains stable.

Correct Answer
verified
Birth + immigration = death + ...
View Answer

Which species has the highest biotic potential?

Correct Answer
verified
B

Correct Answer
verified

All members of a species that reside within an ecosystem make up a(n)

Correct Answer
verified

Increased population densities and increased competition lead to increased emigration.

Correct Answer
verified

Why do many non-native species, such as a prickly pear cactus brought to Australia from South America, rapidly become abundant when first introduced?

Correct Answer
verified

According to the equation for population growth rate, if two populations have the same death rates, then the population with r = 2 will increase more rapidly than a population with r = 4.

Correct Answer
verified

The population shown in the pyramid is

Correct Answer
verified

How do interspecific and intraspecific competition differ?

Correct Answer
verified
Interspecific competition occu...
View Answer

Based on its population pyramid, this population

Correct Answer
verified

Interspecific competition is a density-independent factor.

Correct Answer
verified

Invasive species can rapidly disrupt an ecosystem because they have a high biotic potential and face little environmental resistance.

Correct Answer
verified

Exam 27: Population Growth and Regulation

A population size will remain stable if

Correct AnswerverifiedShow Answer

When mosquitoes are abundant, purple martins flock to the area and feed exclusively on them. When mosquito populations are not large, purple martins are similarly scarce and feed on other insects. This is an example of

Correct AnswerverifiedE

In countries that have large numbers of children under age 15, the population is

Correct AnswerverifiedShow Answer

Based on the data in the table, this population has a_________ growth pattern.

Correct AnswerverifiedShow Answer

Predation is considered a density-dependent factor that controls the population size of prey species. Give two examples of predators acting in density-dependent ways in response to fluctuations in the size of prey populations.

Correct AnswerverifiedPredators may adjust the number of prey ...View AnswerShow Answer

What factors determine Earthʹs carrying capacity for humans?

Correct AnswerverifiedHuman carrying capacity is det...View AnswerShow Answer

An insect population grows exponentially until an early winter freeze kills almost all of the insects. The next spring, the population grows exponentially again. This type of population growth is called

Correct AnswerverifiedShow Answer

What is the term for regular population cycles of rapid growth followed by massive die-off?

Correct Answerverifiedboom-and-bust cycles

Write an equation that describes a situation in which a population remains stable.

Correct AnswerverifiedBirth + immigration = death + ...View AnswerShow Answer

Which species has the highest biotic potential?

Correct AnswerverifiedB

Correct AnswerverifiedShow Answer

All members of a species that reside within an ecosystem make up a(n)

Correct AnswerverifiedShow Answer

Increased population densities and increased competition lead to increased emigration.

Correct AnswerverifiedShow Answer

Why do many non-native species, such as a prickly pear cactus brought to Australia from South America, rapidly become abundant when first introduced?

Correct AnswerverifiedShow Answer

According to the equation for population growth rate, if two populations have the same death rates, then the population with r = 2 will increase more rapidly than a population with r = 4.

Correct AnswerverifiedShow Answer

The population shown in the pyramid is

Correct AnswerverifiedShow Answer

How do interspecific and intraspecific competition differ?

Correct AnswerverifiedInterspecific competition occu...View AnswerShow Answer

Based on its population pyramid, this population

Correct AnswerverifiedShow Answer

Interspecific competition is a density-independent factor.

Correct AnswerverifiedShow Answer

Invasive species can rapidly disrupt an ecosystem because they have a high biotic potential and face little environmental resistance.

Correct AnswerverifiedShow Answer

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E

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Predators may adjust the number of prey ...
View Answer

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Human carrying capacity is det...
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boom-and-bust cycles

Correct Answer
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Birth + immigration = death + ...
View Answer

Correct Answer
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B

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Interspecific competition occu...
View Answer

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Correct Answer
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Correct Answer
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