Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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 disease

Question 3

The following graph 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 4

Because of its shape,the curve describing population growth that occurs when a population grows exponentially is termed ________-shaped.

Accepted Answer

The answer of Because of its shape,the curve describing population...

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

The following figure shows that the human population was small and relatively stable for nearly 12,000 years but has increased dramatically in the past 200 years.  How might this increase in population growth be explained?

Accepted Answer

A)  Effective methods of intercontinental travel permitted humans to immigrate to locations better suited to support larger populations. 
B)  For most of human history, people were too malnourished to have many children. 
C)  People simply chose to have fewer children and smaller families in the past than at present. 
D)  Prior human populations were at existing carrying capacities, but newly developed technologies have raised the carrying capacity and permitted the recent expansion.

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

The carrying capacity of a habitat always remains the same.

Accepted Answer

A) True 
 B)False

Question 9

Factors such as the age of reproductive maturity,maximum litter size,and the gestation period combine to produce an upper limit for the growth rate of any population; under what circumstances is that rate most likely to be seen?

Accepted Answer

A)  when the population approaches a density that's 50 percent of its carrying capacity 
B)  when there are very few individuals in the population, for example, the initial colonists in a new habitat or the first few individuals of an introduced species 
C)  when the population reaches its carrying capacity 
D)  when the survivors following a population crash begin to reproduce

Question 10

The decrease in the availability of food,access to water,or access to cover that accompanies increasing population size illustrates the concept of a(n)

Accepted Answer

A)  density-dependent factor. 
B)  density-independent factor. 
C)  emigration-related factor. 
D)  high-carrying capacity factor.

Question 11

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 12

Which of the following populations would be most vulnerable to an outbreak of a communicable disease?

Accepted Answer

A)  10 grasshoppers living in an area of 100 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)  250,000 people living in an area of 100,000 square meters

Question 13

Food shortages and communicable disease are examples of factors that can increase a population's death rate while simultaneously ________ its growth rate.

Accepted Answer

The answer of Food shortages and communicable disease are examples...

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.

Question 15

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 < the death rate. 
D)  It is not possible to generalize these values.

Question 16

A group of interacting individuals of the same species living within the same area comprises a(n)________.

Accepted Answer

The answer of A group of interacting individuals of the...

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.

Question 18

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.

Question 19

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.

Question 20

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

Exam 21: Growth of Populations

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

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

The following graph 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.

Because of its shape,the curve describing population growth that occurs when a population grows exponentially is termed ________-shaped.

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

The following figure shows that the human population was small and relatively stable for nearly 12,000 years but has increased dramatically in the past 200 years. How might this increase in population growth be explained?

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

The carrying capacity of a habitat always remains the same.

Factors such as the age of reproductive maturity,maximum litter size,and the gestation period combine to produce an upper limit for the growth rate of any population; under what circumstances is that rate most likely to be seen?

The decrease in the availability of food,access to water,or access to cover that accompanies increasing population size illustrates the concept of a(n)

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.

Which of the following populations would be most vulnerable to an outbreak of a communicable disease?

Food shortages and communicable disease are examples of factors that can increase a population's death rate while simultaneously ________ its growth rate.

The size of a population can be decreased by

When an isolated population reaches its carrying capacity

A group of interacting individuals of the same species living within the same area comprises a(n)________.

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

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?

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

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