Question 1

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

Accepted Answer

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

Question 2

When an S-shaped growth curve levels it is an indication that a population may have reached its carrying capacity.

Accepted Answer

A) True 
 B)False

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

A)  They do not yet have any natural predators in their new habitat.
B)  Most introduced species show better survival in new habitats than in their old ones.
C)  Because most native species display exponential growth, many introduced species will do so also.
D)  Native species always leave open habitat types that a new species can inhabit.

Question 5

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; an organism may be able to live in many locations, but the resources it requires may be available in varying amounts.
D)  No; it is not possible for two habitats to have the same carrying capacity.

Question 6

In natural systems, populations do not change in size when birth + immigration = death + emigration.

Accepted Answer

A) True 
 B)False

Question 7

In 1978, a drought on the Galapagos Islands caused a reduction in the production of seeds that one of Darwin's finches, a kind of bird, fed upon. This caused a decrease from 1,400 to 200 birds. This population change factor

Accepted Answer

A)  would not be not considered a part of the carrying capacity for these birds.
B)  was density-dependent.
C)  was density-independent.
D)  resulted in exponential growth for the bird population.

Question 8

In computing an individual's ecological footprint, which of the following would not be included?

Accepted Answer

A)  energy demand
B)  food use
C)  goods and services use
D)  education level

Question 9

The human population crash that occurred on Easter Island was due to

Accepted Answer

A)  fire.
B)  expanding forests and the consequent loss of farmland.
C)  the aftermath of a volcanic eruption.
D)  deforestation, soil erosion, and resource depletion.

Question 10

One herd of elephants (Herd A) has 100 individuals and a growth rate of 1.5. Another herd (Herd B) has 200 individuals and a growth rate of .7. Herd C has a population of 75 and a growth rate of 2. Herd D has a population of 50 and a growth rate of 4. Assuming no other factors are involved, which herd will be largest next year?

Accepted Answer

A)  Herd A
B)  Herd B
C)  Herd C
D)  Herd D

Question 11

The ecological footprint of a typical college student in the United States is about the same as a typical college student at a university in China.

Accepted Answer

A) True 
 B)False

Question 12

The carrying capacity of a population can be affected by weather.

Accepted Answer

A) True 
 B)False

Question 13

Lynx feed on rabbits, and the growth curves for these two species fluctuate together. This relationship is an example of a(n)

Accepted Answer

A)  S-shaped growth curve.
B)  J-shaped growth curve.
C)  irregular fluctuation.
D)  tightly linked cycle.

Question 14

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

Accepted Answer

A)  the contamination level of any organism 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.

Question 15

Populations generally change in size over time.

Accepted Answer

A) True 
 B)False

Question 16

At room temperature, a population of dangerous bacteria on a piece of raw chicken increases from 100,000 to 400,000 in 40 minutes. Its doubling time is ____________________ minutes.

Accepted Answer

The answer of At room temperature, a population of dangerous...

Question 17

A population can increase in size indefinitely.

Accepted Answer

A) True 
 B)False

Question 18

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.

Question 19

____________________ growth occurs when the population size increases by a constant proportion from one generation to the next.

Accepted Answer

The answer of ____________________ growth occurs when the population size...

Question 20

A(n)____________________-shaped curve describes population growth that occurs when a population grows exponentially.

Accepted Answer

The answer of A(n)____________________-shaped curve describes population growth that occurs...

Exam 22: Growth of Populations

At room temperature, a population of dangerous bacteria on a piece of raw chicken increases from 100,000 to 400,000 in 40 minutes. Its doubling time is ____________________ minutes.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

The ecological footprint of a typical college student in the United States is about the same as a typical college student at a university in China.

Correct Answer
verified

Populations generally change in size over time.

Correct Answer
verified

In natural systems, populations do not change in size when birth + immigration = death + emigration.

Correct Answer
verified

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

Correct Answer
verified

In 1978, a drought on the Galapagos Islands caused a reduction in the production of seeds that one of Darwin's finches, a kind of bird, fed upon. This caused a decrease from 1,400 to 200 birds. This population change factor

Correct Answer
verified

____________________ growth occurs when the population size increases by a constant proportion from one generation to the next.

Correct Answer
verified

When an S-shaped growth curve levels it is an indication that a population may have reached its carrying capacity.

Correct Answer
verified

In computing an individual's ecological footprint, which of the following would not be included?

Correct Answer
verified

A population can increase in size indefinitely.

Correct Answer
verified

Lynx feed on rabbits, and the growth curves for these two species fluctuate together. This relationship is an example of a(n)

Correct Answer
verified

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

Correct Answer
verified

Which of the following statements about carrying capacity is true?

Correct Answer
verified

The human population crash that occurred on Easter Island was due to

Correct Answer
verified

A(n)____________________-shaped curve describes population growth that occurs when a population grows exponentially.

Correct Answer
verified

Correct Answer
verified

The carrying capacity of a population can be affected by weather.

Correct Answer
verified

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

Correct Answer
verified

Exam 22: Growth of Populations

At room temperature, a population of dangerous bacteria on a piece of raw chicken increases from 100,000 to 400,000 in 40 minutes. Its doubling time is ____________________ minutes.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The ecological footprint of a typical college student in the United States is about the same as a typical college student at a university in China.

Correct AnswerverifiedShow Answer

Populations generally change in size over time.

Correct AnswerverifiedShow Answer

In natural systems, populations do not change in size when birth + immigration = death + emigration.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In 1978, a drought on the Galapagos Islands caused a reduction in the production of seeds that one of Darwin's finches, a kind of bird, fed upon. This caused a decrease from 1,400 to 200 birds. This population change factor

Correct AnswerverifiedShow Answer

____________________ growth occurs when the population size increases by a constant proportion from one generation to the next.

Correct AnswerverifiedShow Answer

When an S-shaped growth curve levels it is an indication that a population may have reached its carrying capacity.

Correct AnswerverifiedShow Answer

In computing an individual's ecological footprint, which of the following would not be included?

Correct AnswerverifiedShow Answer

A population can increase in size indefinitely.

Correct AnswerverifiedShow Answer

Lynx feed on rabbits, and the growth curves for these two species fluctuate together. This relationship is an example of a(n)

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

Which of the following statements about carrying capacity is true?

Correct AnswerverifiedShow Answer

The human population crash that occurred on Easter Island was due to

Correct AnswerverifiedShow Answer

A(n)____________________-shaped curve describes population growth that occurs when a population grows exponentially.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The carrying capacity of a population can be affected by weather.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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