Question 1

Which of the following is likely to make the smallest contribution to annual changes in the size of a population?

Accepted Answer

A)  extreme weather events such as a hurricane 
B)  an introduced species that preys on the population 
C)  global climate change 
D)  an outbreak of a highly infectious disease 
A)  extreme weather events such as a hurricane 
B)  an introduced species that preys on the population 
C)  global climate change 
D)  an outbreak of a highly infectious disease C

Question 2

Populations generally change in size over time.

Accepted Answer

A) True 
 B)False  True

Question 3

If everyone lived a lifestyle as consumptive as American college students,the total acreage required would be the equivalent of ________ Earths.

Accepted Answer

4.5

Question 4

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 5

The Rapanui people initiated the environmental disasters on Easter Island by first

Accepted Answer

A)  planting crops that required too much water. 
B)  overfishing the lagoons around the island. 
C)  removing protective vegetation and exposing the soil to increased erosion. 
D)  using resources to make statues instead of using these resources as fertilizer. 
A)  planting crops that required too much water. 
B)  overfishing the lagoons around the island. 
C)  removing protective vegetation and exposing the soil to increased erosion. 
D)  using resources to make statues instead of using these resources as fertilizer.

Question 6

Using the environment in ways that can continue indefinitely,neither depleting essential resources nor causing environmental damage,is defined as ________ use.

Accepted Answer

The answer of Using the environment in ways that can...

Question 7

Food production and consumption are not well matched throughout the world;preventing mass starvation would be possible if nontraditional food sources could be developed.One of the most promising,because they grow quickly and have a high protein content,is ________.

Accepted Answer

The answer of Food production and consumption are not well...

Question 8

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. 
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.

Question 9

In 1978,a drought on the Galápagos Islands caused a reduction in the production of seeds that one of the finches,a type of bird,fed upon.This resulted in a decrease from 1,400 to 200 birds.Drought,in this specific situation,

Accepted Answer

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

Question 10

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

Question 11

When an S-shaped growth curve levels,it is an indication that a population may have reached its carrying capacity and that at least one critical resource has become limiting.

Accepted Answer

A) True 
 B)False

Question 12

At room temperature,a population of dangerous bacteria on a piece of raw chicken increases from 100,000 to 400,000 in 40 minutes.During this period of exponential growth,the population doubles every ________ minutes.

Accepted Answer

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

Question 13

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

Question 14

The definition of an area,relative to a population study,

Accepted Answer

A)  is constant. 
B)  is always 1 square meter. 
C)  depends on the questions being asked and specific characteristics of the species forming the population. 
D)  depends on whether the area is terrestrial or aquatic. 
A)  is constant. 
B)  is always 1 square meter. 
C)  depends on the questions being asked and specific characteristics of the species forming the population. 
D)  depends on whether the area is terrestrial or aquatic.

Question 15

Pollution is one of the many density-dependent factors that can limit population growth.

Accepted Answer

A) True 
 B)False

Question 16

As a component of its solution for overpopulation,China has imposed a policy that legally limits families to one child;China's government is attempting to manipulate which population factor?

Accepted Answer

A)  N 
B)  r 
C)  carrying capacity 
D)  food supply 
A)  N 
B)  r 
C)  carrying capacity 
D)  food supply

Question 17

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. 
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 18

Biologists estimate that the human population on Easter Island declined by 90 percent during the 200-year period between AD 1400 and 1600;what accounts for the crash of this population?

Accepted Answer

A)  the introduction of novel diseases brought by visiting Polynesians 
B)  expanding forests and the consequent loss of farmland 
C)  the aftermath of a volcanic eruption 
D)  deforestation,soil erosion,and resource depletion 
A)  the introduction of novel diseases brought by visiting Polynesians 
B)  expanding forests and the consequent loss of farmland 
C)  the aftermath of a volcanic eruption 
D)  deforestation,soil erosion,and resource depletion

Question 19

The type of growth that occurs when the population size increases by a constant proportion over time is known as ________.

Accepted Answer

The answer of The type of growth that occurs when...

Question 20

Bald eagle populations reached such low numbers in the 1960s that some biologists predicted their extinction in the continental United States;what action appears to have been most significant in reversing their decline?

Accepted Answer

A)  Eagle sanctuaries were established to provide protection for nesting eagles. 
B)  Bounties on eagle predators were enacted. 
C)  The use of DDT was banned in the United States. 
D)  Eagles were reared in captivity until reaching an age of self-sufficiency and then returned to the wild. 
A)  Eagle sanctuaries were established to provide protection for nesting eagles. 
B)  Bounties on eagle predators were enacted. 
C)  The use of DDT was banned in the United States. 
D)  Eagles were reared in captivity until reaching an age of self-sufficiency and then returned to the wild.

Exam 21: Growth of Populations

Which of the following is likely to make the smallest contribution to annual changes in the size of a population?

Populations generally change in size over time.

If everyone lived a lifestyle as consumptive as American college students,the total acreage required would be the equivalent of ________ Earths.

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

The Rapanui people initiated the environmental disasters on Easter Island by first

Using the environment in ways that can continue indefinitely,neither depleting essential resources nor causing environmental damage,is defined as ________ use.

Food production and consumption are not well matched throughout the world;preventing mass starvation would be possible if nontraditional food sources could be developed.One of the most promising,because they grow quickly and have a high protein content,is ________.

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

In 1978,a drought on the Galápagos Islands caused a reduction in the production of seeds that one of the finches,a type of bird,fed upon.This resulted in a decrease from 1,400 to 200 birds.Drought,in this specific situation,

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?

When an S-shaped growth curve levels,it is an indication that a population may have reached its carrying capacity and that at least one critical resource has become limiting.

At room temperature,a population of dangerous bacteria on a piece of raw chicken increases from 100,000 to 400,000 in 40 minutes.During this period of exponential growth,the population doubles every ________ minutes.

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?

The definition of an area,relative to a population study,

Pollution is one of the many density-dependent factors that can limit population growth.

As a component of its solution for overpopulation,China has imposed a policy that legally limits families to one child;China's government is attempting to manipulate which population factor?

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)

Biologists estimate that the human population on Easter Island declined by 90 percent during the 200-year period between AD 1400 and 1600;what accounts for the crash of this population?

The type of growth that occurs when the population size increases by a constant proportion over time is known as ________.

Bald eagle populations reached such low numbers in the 1960s that some biologists predicted their extinction in the continental United States;what action appears to have been most significant in reversing their decline?

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