Question 1

Natural disasters can limit population growth in ways not related to population density.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following choices best explains why some introduced species experience an initial period of exponential growth?

Accepted Answer

A)   They typically have fewer natural predators and/or parasites in their new habitat,so their growth is unhindered until a critical resource becomes limiting.
B)   Most introduced species show improved survival in new habitats in comparison to their old ones.
C)   Growth patterns are functions of the habitat;introduced species grow exponentially,and their growth is virtually identical to that of the native species.
D)   Native species specialize,leaving open habitats that new species can use.E) B) and C)
F) A) and D)

Question 3

Nene,the Hawaiian goose,live in the wild on Hawaii,Maui,Kauai,and Molokai.The population density on Maui is 0.227 birds per square kilometer,and the island is 1,830 square kilometers in size.Approximately how many nene live on Maui?

Accepted Answer

A)   16
B)   150
C)   415
D)   12,400E) All of the above
F) None of the above

Question 4

The effects of pollution are generally considered to be density independent because

Accepted Answer

A)   the level at which any organism is contaminated with pollutants is unaffected by variations in population density.
B)   when food supplies become limited,the organisms are more likely to consume contaminated foods.
C)   at high densities,the organisms are more likely to contact the pollutant.
D)   when the organisms are stressed by overcrowding,the pollutant becomes more toxic.E) All of the above
F) A) and C)

Question 5

Examine the following graph,which shows the relationship between planting density and seeds produced per individual plant for Plantago major,also known as plantain weed.

What statement best describes the relationship?

Accepted Answer

A)   At high planting densities,both seed production per plant and total seeds produced decline.
B)   At high planting densities,seed production per plant declines while total seeds produced remain constant.
C)   At low planting densities,both seed production per plant and total seeds produced increase.
D)   At high planting densities,seed production per plant declines while total seeds produced increases.E) B) and C)
F) A) and C)

Question 6

The top of the "S" in an S-shaped curve indicates that the population

Accepted Answer

A)   is on the verge of collapse.
B)   is experiencing abnormally heavy mortality pressure from predators or disease.
C)   has reached its carrying capacity.
D)   is poised for further exponential growth.E) A) and B)
F) All of the above

Question 7

A population can increase in size indefinitely.

Accepted Answer

A) True 
 B)False

Question 8

Density-dependent factors are more likely to limit population growth when

Accepted Answer

A)   there are many individuals living in a fixed amount of space.
B)   the population moves into a larger habitat.
C)   food is abundant.
D)   weather conditions become milder.E) A) and D)
F) C) and D)

Question 9

A population will remain at a constant size when emigration equals immigration and

Accepted Answer

A)   food is not a limiting factor.
B)   births equal deaths.
C)   predators leave the area.
D)   available space remains the same.E) A) and B)
F) A) and C)

Question 10

Which of the following statements about carrying capacity is true?

Accepted Answer

A)   An S-shaped curve represents a population's ability to increase its numbers above the carrying capacity of its habitat.
B)   J-shaped curves show the immediate limiting effect of carrying capacity on a newly introduced organism.
C)   The carrying capacity is the same for all organisms in the same area.
D)   The carrying capacity is established by the factor with the most limited availability.E) C) and D)
F) None of the above

Question 11

Humans appear to be the only species not subject to limits on the size of its population.

Accepted Answer

A) True 
 B)False

Question 12

Insects represent a highly nutritious and relatively inexpensive potential human food source.

Accepted Answer

A) True 
 B)False

Question 13

The carrying capacity of a habitat always remains the same.

Accepted Answer

A) True 
 B)False

Question 14

When the combination of death and emigration rates is lower than the combination of birth and immigration rates,the population will ________.

Accepted Answer

The answer of When the combination of death and emigration...

Question 15

For most populations,irregular fluctuations in size or density

Accepted Answer

A)   are less commonly experienced than the smooth J-shaped growth curve.
B)   occur commonly before carrying capacity is reached.
C)   are more common than the smooth J-shaped growth curve.
D)   occur only when density-independent factors dominate.E) A) and B)
F) C) and D)

Question 16

Exponential growth curves are always linear since the population grows at a constant proportion.

Accepted Answer

A) True 
 B)False

Question 17

Is it reasonable to expect that all habitats suitable for a given organism will have the same carrying capacity for that organism?

Accepted Answer

A)   Yes;unless the carrying capacities are the same,the habitat would not be suitable.
B)   Yes;the carrying capacity is determined solely by the type of organism being considered.
C)   No;the habitat is the location where all essential resources occur,but these resources may be available in varying amounts.
D)   No;it is not possible for two habitats to have the same carrying capacity.E) B) and C)
F) A) and C)

Question 18

The approximate number of humans on Earth in 2012 is 7 billion.

Accepted Answer

A) True 
 B)False

Question 19

The term population density describes the

Accepted Answer

A)   body size of different species.
B)   number of individuals per unit area.
C)   number of populations per unit area.
D)   number of species per unit area.E) A) and D)
F) B) and C)

Question 20

Which of the following populations would be most likely to experience an S-shaped growth pattern?

Accepted Answer

A)   the lion population living at the San Diego Zoo
B)   paramecia in an experimental culture where food was added only at the beginning of the experiment
C)   a wolf population after its reintroduction to a national park such as Yellowstone or Glacier,where they once lived but had become locally extinct
D)   a beehive infected midsummer with a deadly bacterial diseaseE) A) and C)
F) All of the above

Exam 21: Growth of Populations

Which of the following statements about carrying capacity is true?

Correct AnswerverifiedShow Answer

Humans appear to be the only species not subject to limits on the size of its population.

Correct AnswerverifiedShow Answer

When the combination of death and emigration rates is lower than the combination of birth and immigration rates,the population will ________.

Correct AnswerverifiedShow Answer

Density-dependent factors are more likely to limit population growth when

Correct AnswerverifiedShow Answer

The effects of pollution are generally considered to be density independent because

Correct AnswerverifiedShow Answer

Which of the following populations would be most likely to experience an S-shaped growth pattern?

Correct AnswerverifiedShow Answer

A population will remain at a constant size when emigration equals immigration and

Correct AnswerverifiedShow Answer

The approximate number of humans on Earth in 2012 is 7 billion.

Correct AnswerverifiedShow Answer

Exponential growth curves are always linear since the population grows at a constant proportion.

Correct AnswerverifiedShow Answer

Natural disasters can limit population growth in ways not related to population density.

Correct AnswerverifiedShow Answer

A population can increase in size indefinitely.

Correct AnswerverifiedShow Answer

Which of the following choices best explains why some introduced species experience an initial period of exponential growth?

Correct AnswerverifiedShow Answer

For most populations,irregular fluctuations in size or density

Correct AnswerverifiedShow Answer

The top of the "S" in an S-shaped curve indicates that the population

Correct AnswerverifiedShow Answer

Insects represent a highly nutritious and relatively inexpensive potential human food source.

Correct AnswerverifiedShow Answer

Is it reasonable to expect that all habitats suitable for a given organism will have the same carrying capacity for that organism?

Correct AnswerverifiedShow Answer

Nene,the Hawaiian goose,live in the wild on Hawaii,Maui,Kauai,and Molokai.The population density on Maui is 0.227 birds per square kilometer,and the island is 1,830 square kilometers in size.Approximately how many nene live on Maui?

Correct AnswerverifiedShow Answer

Examine the following graph,which shows the relationship between planting density and seeds produced per individual plant for Plantago major,also known as plantain weed. What statement best describes the relationship?

Correct AnswerverifiedShow Answer

The term population density describes the

Correct AnswerverifiedShow Answer

The carrying capacity of a habitat always remains the same.

Correct AnswerverifiedShow Answer

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