Question 1

Deforestation increases the productivity of land.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following correctly describes the effect parasites have on their host's population size and on the host itself?

Accepted Answer

A)   Parasites have a density- dependent effect, but they do not affect host death rates.
B)   Parasites have a density- dependent effect, and they usually kill their hosts.
C)   Parasites have a density- independent effect, and they usually kill their hosts.
D)   Parasites have a density- independent effect, but they do not usually kill their hosts.
E)   Parasites have a density- dependent effect, but they do not usually kill their hosts.F) A) and B)
G) A) and D)

Question 3

A population of birds migrating to winter nesting grounds is blown off course by a late- season hurricane and ends up on an island that is uninhabited by any animal species. Which of the following represents a density- independent factor that will limit the population size?

Accepted Answer

A)   Heavily wooded
B)   Abundant fruit trees
C)   Freshwater spring
D)   Abundant berry bushes
E)   Nightly temperature dropping below freezingF) A) and E)
G) B) and E)

Question 4

A population grows exponentially when

Accepted Answer

A)   emigration exceeds immigration and the birth rate equals the death rate.
B)   the birth rate and the death rate are equal.
C)   the birth rate exceeds the death rate and immigration exceeds emigration.
D)   the carrying capacity is exceeded.
E)   the death rate equals the birth rate and immigration is equal to emigration.F) A) and C)
G) All of the above

Question 5

Parasitism is a density- dependent population control.

Accepted Answer

A) True 
 B)False

Question 6

In areas that have a stable population, the number of children born in a period of time is

Accepted Answer

A)   approximately equal to the number of adults.
B)   higher than the number of adults.
C)   lower than the number of adults.
D)   increasing.
E)   decreasing.F) D) and E)
G) A) and E)

Question 7

-According to the graph, how long does it take the population of deer that is experiencing moderate growth (r = 0.2)  to reach 3,000 deer?

Accepted Answer

A)   35 years
B)   15 years
C)   20 years
D)   All three populations grow at the same rate.
E)   None of the three populations grows to 3,000.F) A) and C)
G) A) and B)

Question 8

A complex, interrelated network of organisms and the surrounding nonliving environment in a defined area is a(n)

Accepted Answer

A)   population.
B)   biome.
C)   biosphere.
D)   ecosystem.
E)   community.F) A) and B)
G) A) and C)

Question 9

The study of how organisms interact with one another and with their nonliving environment is

Accepted Answer

A)   anatomy.
B)   ecosystems.
C)   ecology.
D)   genetics.
E)   morphology.F) A) and E)
G) B) and D)

Question 10

If a caterpillar eats all of the seedlings in your garden, killing all of them, the caterpillar is acting as a

Accepted Answer

A)   saprophyte.
B)   density- independent factor.
C)   competitor.
D)   predator.
E)   parasite.F) D) and E)
G) B) and C)

Question 11

A J- curve is typical of a stable population.

Accepted Answer

A) True 
 B)False

Question 12

Parasites often kill their hosts, although they do not directly benefit from their hosts' death. Yet many ecologists believe that parasites may have beneficial effects on their host populations. Why?

Accepted Answer

Parasites tend to destroy weaker and les...

Question 13

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 14

In a constant- loss population, an organism has an equal risk of dying at any time during its life span.

Accepted Answer

A) True 
 B)False

Question 15

All the members of a species that live within an ecosystem form a(n) _ .

Accepted Answer

The answer of All the members of a species that...

Question 16

Natural populations cannot exceed their carrying capacities.

Accepted Answer

A) True 
 B)False

Question 17

A laboratory experiment followed the growth of a flour beetle (Tribolium sp.)  population over time. At first, the population increased dramatically, but later the growth slowed and the population size leveled off. Although food (the wheat flour in which they live)  was still abundant, the flour beetles resorted to eating their own eggs when population densities got high. What can we conclude about cannibalism in this species?

Accepted Answer

A)   We cannot reach any conclusions based on the information provided.
B)   It is a density- independent means of population control.
C)   It has no effect on the growth of the population, as food scarcity is clearly the limiting factor.
D)   It is clearly maladaptive, as populations always do best when their densities increase as much as possible.
E)   It is a density- dependent means of population control.F) None of the above
G) B) and C)

Question 18

Populations that have been relatively undisturbed by humans normally grow, with no limits set by their environments.

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

Birth + immigration = death + ...

Question 20

Density- dependent factors become less effective as the population size increases.

Accepted Answer

A) True 
 B)False

Exam 27: Population Growth and Regulation

Deforestation increases the productivity of land.

Correct Answer
verified

A population of birds migrating to winter nesting grounds is blown off course by a late- season hurricane and ends up on an island that is uninhabited by any animal species. Which of the following represents a density- independent factor that will limit the population size?

Correct Answer
verified

The study of how organisms interact with one another and with their nonliving environment is

Correct Answer
verified

A J- curve is typical of a stable population.

Correct Answer
verified

In a constant- loss population, an organism has an equal risk of dying at any time during its life span.

Correct Answer
verified

A population grows exponentially when

Correct Answer
verified

Natural populations cannot exceed their carrying capacities.

Correct Answer
verified

If a caterpillar eats all of the seedlings in your garden, killing all of them, the caterpillar is acting as a

Correct Answer
verified

A complex, interrelated network of organisms and the surrounding nonliving environment in a defined area is a(n)

Correct Answer
verified

Populations that have been relatively undisturbed by humans normally grow, with no limits set by their environments.

Correct Answer
verified

Parasites often kill their hosts, although they do not directly benefit from their hosts' death. Yet many ecologists believe that parasites may have beneficial effects on their host populations. Why?

Correct Answer
verified
Parasites tend to destroy weaker and les...
View Answer

All the members of a species that live within an ecosystem form a(n) _ .

Correct Answer
verified

-According to the graph, how long does it take the population of deer that is experiencing moderate growth (r = 0.2) to reach 3,000 deer?

Correct Answer
verified

Which of the following correctly describes the effect parasites have on their host's population size and on the host itself?

Correct Answer
verified

Density- dependent factors become less effective as the population size increases.

Correct Answer
verified

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

In areas that have a stable population, the number of children born in a period of time is

Correct Answer
verified

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

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

Parasitism is a density- dependent population control.

Correct Answer
verified

Exam 27: Population Growth and Regulation

Deforestation increases the productivity of land.

Correct AnswerverifiedShow Answer

A population of birds migrating to winter nesting grounds is blown off course by a late- season hurricane and ends up on an island that is uninhabited by any animal species. Which of the following represents a density- independent factor that will limit the population size?

Correct AnswerverifiedShow Answer

The study of how organisms interact with one another and with their nonliving environment is

Correct AnswerverifiedShow Answer

A J- curve is typical of a stable population.

Correct AnswerverifiedShow Answer

In a constant- loss population, an organism has an equal risk of dying at any time during its life span.

Correct AnswerverifiedShow Answer

A population grows exponentially when

Correct AnswerverifiedShow Answer

Natural populations cannot exceed their carrying capacities.

Correct AnswerverifiedShow Answer

If a caterpillar eats all of the seedlings in your garden, killing all of them, the caterpillar is acting as a

Correct AnswerverifiedShow Answer

A complex, interrelated network of organisms and the surrounding nonliving environment in a defined area is a(n)

Correct AnswerverifiedShow Answer

Populations that have been relatively undisturbed by humans normally grow, with no limits set by their environments.

Correct AnswerverifiedShow Answer

Parasites often kill their hosts, although they do not directly benefit from their hosts' death. Yet many ecologists believe that parasites may have beneficial effects on their host populations. Why?

Correct AnswerverifiedParasites tend to destroy weaker and les...View AnswerShow Answer

All the members of a species that live within an ecosystem form a(n) _ .

Correct AnswerverifiedShow Answer

-According to the graph, how long does it take the population of deer that is experiencing moderate growth (r = 0.2) to reach 3,000 deer?

Correct AnswerverifiedShow Answer

Which of the following correctly describes the effect parasites have on their host's population size and on the host itself?

Correct AnswerverifiedShow Answer

Density- dependent factors become less effective as the population size increases.

Correct AnswerverifiedShow Answer

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

In areas that have a stable population, the number of children born in a period of time is

Correct AnswerverifiedShow Answer

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

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

Parasitism is a density- dependent population control.

Correct AnswerverifiedShow Answer

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Parasites tend to destroy weaker and les...
View Answer

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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Birth + immigration = death + ...
View Answer

Correct Answer
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