Question 1

Which of the following has the highest population density?

Accepted Answer

A)  1 grasshopper living in an area of 10 square meters. 
B)  100 rabbits living in an area of 10,000 square meters 
C)  200 sparrows living in an area of 20,000 square meters 
D)  1,500 oysters living in an area of 1,500 square meters 
A)  1 grasshopper living in an area of 10 square meters. 
B)  100 rabbits living in an area of 10,000 square meters 
C)  200 sparrows living in an area of 20,000 square meters 
D)  1,500 oysters living in an area of 1,500 square meters

Question 2

The current rate of human population growth is

Accepted Answer

A)  not sustainable. 
B)  sustainable. 
C)  a tightly linked cycle. 
D)  fairly low. 
A)  not sustainable. 
B)  sustainable. 
C)  a tightly linked cycle. 
D)  fairly low.

Question 3

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 4

Humans could be described as an invasive species.

Accepted Answer

A) True 
 B)False

Question 5

What was the effect of the pesticide DDT on bald eagles?

Accepted Answer

A)  They lost the ability to fly. 
B)  The animals they ate as prey were killed by the DDT. 
C)  Their eggs were fragile, breaking before the chicks could develop fully. 
D)  The trees they lived in were killed by the DDT. 
A)  They lost the ability to fly. 
B)  The animals they ate as prey were killed by the DDT. 
C)  Their eggs were fragile, breaking before the chicks could develop fully. 
D)  The trees they lived in were killed by the DDT.

Question 6

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

Accepted Answer

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

Question 7

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. 
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 8

A population grows as more of its individuals emigrate.

Accepted Answer

A) True 
 B)False

Question 9

A population of 100 individuals has a doubling time of 25 years. What size will this population be in 100 years?

Accepted Answer

A)  100 
B)  400 
C)  800 
D)  1,600 
A)  100 
B)  400 
C)  800 
D)  1,600

Question 10

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. 
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.

Question 11

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

Question 12

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 13

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 while 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: density-dependent and density-independent factors cannot affect the same population of organisms at the same time. 
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 while 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: density-dependent and density-independent factors cannot affect the same population of organisms at the same time.

Question 14

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

Question 15

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

Question 16

When an isolated population reaches its carry capacity

Accepted Answer

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

Question 17

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. 
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 18

_______ 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 19

The initial success of a human civilization

Accepted Answer

A)  is typically characterized by decreases in population density. 
B)  simply postpones its inevitable collapse. 
C)  does not guarantee its future existence. 
D)  has no effect on population factors. 
A)  is typically characterized by decreases in population density. 
B)  simply postpones its inevitable collapse. 
C)  does not guarantee its future existence. 
D)  has no effect on population factors.

Question 20

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

Accepted Answer

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

Exam 34: Growth of Populations

Which of the following has the highest population density?

The current rate of human population growth is

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.

Humans could be described as an invasive species.

What was the effect of the pesticide DDT on bald eagles?

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

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

A population grows as more of its individuals emigrate.

A population of 100 individuals has a doubling time of 25 years. What size will this population be in 100 years?

For most populations, irregular fluctuations in size or density

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

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

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

The size of a population can be decreased by

When an isolated population reaches its carry capacity

Which of the following statements about carrying capacity is true?

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

The initial success of a human civilization

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

The Nature of Science and the Characteristics of Life

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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.