Question 1

When an isolated population reaches its carrying capacity

Accepted Answer

A)  the birth rate > the death rate.
B)  the birth rate = the death rate.
C)  the birth rate 
D)  It is not possible to generalize these values.

Question 2

The change in size of a given population of organisms may have a direct impact on humans. The 1993 outbreak of hantavirus in the southwestern United States was partly due to a(n)

Accepted Answer

A)  tightly linked cycle of human and hantavirus populations.
B)  increase in the deer mouse population size.
C)  decline in the desert salamander population, the normal hantavirus host.
D)  increase in human population size.

Question 3

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.

Question 4

Exponential growth curves are always J-shaped.

Accepted Answer

A) True 
 B)False

Question 5

The population explosion that occurred shortly after the Opuntia cactus was introduced to Australia is an example of

Accepted Answer

A)  exponential growth.
B)  emigration.
C)  reduced population density.
D)  a native species outcompeting an introduced species.

Question 6

The maximum population size that can be supported by its habitat is known as

Accepted Answer

A)  maximum increase.
B)  carrying capacity.
C)  exponential growth.
D)  population balance.

Question 7

The carrying capacity of owls in an Alaskan forest is 8 per square kilometer. What will happen if 12 owls are confined to a 1-square-kilometer area?

Accepted Answer

A)  The owls will survive together and develop ways to share resources.
B)  The owls might survive as malnourished adults but the next generation will have no more than eight individuals.
C)  The population of owl prey organisms will increase proportionately.
D)  A short-term exponential growth of owls will occur.

Question 8

Overall, when there are more individuals in a population, birth rates ____________________.

Accepted Answer

The answer of Overall, when there are more individuals in...

Question 9

China's ____________________ policy has slowed the growth of the population in that country to 0.57 percent currently from 1.07 percent during the 1990s.

Accepted Answer

The answer of China's ____________________ policy has slowed the growth...

Question 10

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 pressure from predators.
C)  has reached its carrying capacity.
D)  is poised for further exponential growth.

Question 11

A population is counted at 100 individuals in 1998. In 2006, a new count found 1,600 individuals. What is the doubling time for the population?

Accepted Answer

A)  0.5 year
B)  1 year
C)  1.5 years
D)  2 years

Question 12

A population grows as more of its individuals emigrate.

Accepted Answer

A) True 
 B)False

Question 13

A population of 100 individuals is undergoing exponential growth, with a constant growth rate of 0.2 per year. What size will this population be in 2 years?

Accepted Answer

A)  100
B)  120
C)  144
D)  200

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

If we humans do not limit our population growth rate, we will exceed the ____________________ of our environment, leading to a larger population than the environment can support.

Accepted Answer

The answer of If we humans do not limit our...

Question 16

The graph below shows the growth of a Paramecium population. 
The greatest amount of daily growth occurred when the population was at approximately _____ percent of its carrying capacity

Accepted Answer

A)  10
B)  25
C)  50
D)  100

Question 17

The size of a population can be decreased by

Accepted Answer

A)  a higher birth rate.
B)  immigration.
C)  emigration.
D)  a reduced death rate.

Question 18

Which of the following has the smallest contribution to annual changes in the size of a population?

Accepted Answer

A)  weather
B)  predators
C)  climate
D)  disease

Question 19

Use of the environment that can continue indefinitely without depleting all our resources or causing environmental damage is defined as being ____________________.

Accepted Answer

The answer of Use of the environment that can continue...

Question 20

Which of the following situations illustrates a link between the effects of density-dependent and density-independent factors?

Accepted Answer

A)  A flood causes a river to overflow and drown a herd of deer.
B)  A drought occurs; a small herd of deer is able to survive, whereas a larger herd in the same area perishes.
C)  A population of deer increases to a size at which individuals are competing with each other to get enough food.
D)  None of the above are correct because density-dependent and density-independent factors cannot affect the same population of organisms at the same time.

Exam 22: Growth of Populations

A population grows as more of its individuals emigrate.

Correct AnswerverifiedShow Answer

When an isolated population reaches its carrying capacity

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A population of 100 individuals is undergoing exponential growth, with a constant growth rate of 0.2 per year. What size will this population be in 2 years?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The carrying capacity of owls in an Alaskan forest is 8 per square kilometer. What will happen if 12 owls are confined to a 1-square-kilometer area?

Correct AnswerverifiedShow Answer

Which of the following has the smallest contribution to annual changes in the size of a population?

Correct AnswerverifiedShow Answer

If we humans do not limit our population growth rate, we will exceed the ____________________ of our environment, leading to a larger population than the environment can support.

Correct AnswerverifiedShow Answer

A population is counted at 100 individuals in 1998. In 2006, a new count found 1,600 individuals. What is the doubling time for the population?

Correct AnswerverifiedShow Answer

Use of the environment that can continue indefinitely without depleting all our resources or causing environmental damage is defined as being ____________________.

Correct AnswerverifiedShow Answer

The change in size of a given population of organisms may have a direct impact on humans. The 1993 outbreak of hantavirus in the southwestern United States was partly due to a(n)

Correct AnswerverifiedShow Answer

Exponential growth curves are always J-shaped.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The maximum population size that can be supported by its habitat is known as

Correct AnswerverifiedShow Answer

The population explosion that occurred shortly after the Opuntia cactus was introduced to Australia is an example of

Correct AnswerverifiedShow Answer

The term population density describes the

Correct AnswerverifiedShow Answer

Overall, when there are more individuals in a population, birth rates ____________________.

Correct AnswerverifiedShow Answer

China's ____________________ policy has slowed the growth of the population in that country to 0.57 percent currently from 1.07 percent during the 1990s.

Correct AnswerverifiedShow Answer

Which of the following situations illustrates a link between the effects of density-dependent and density-independent factors?

Correct AnswerverifiedShow Answer

The graph below shows the growth of a Paramecium population. The greatest amount of daily growth occurred when the population was at approximately _____ percent of its carrying capacity

Correct AnswerverifiedShow Answer

The size of a population can be decreased by

Correct AnswerverifiedShow Answer

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