Question 1

Which of the following is an example of a population?

Accepted Answer

A)  all students attending colleges and universities in your state
B)  the various plants found in prairies in the western United States
C)  all of the students in your classroom
D)  all of the microorganisms on your skin

Question 2

An r- selected species typically

Accepted Answer

A)  offers considerable parental care to offspring.
B)  is large- bodied and long- lived.
C)  has an advantage in habitats that experience unpredictable disturbances.
D)  lives in stable climates.

Question 3

Which of the following organisms best illustrates K- selection?

Accepted Answer

A)  a polar bear producing one or two cubs every three years
B)  a species of weed that quickly spreads into a region of cleared trees
C)  the production of thousands of eggs every spring by frogs
D)  mice that produce three litters of 10- 15 babies in the course of a summer

Question 4

Which of the following will likely decrease a population's size?

Accepted Answer

A)  decreasing the food supply available to the population
B)  practicing sustainable resource management in its habitat
C)  improving the quality of its habitat
D)  increasing the size of its habitat

Question 5

A survivorship curve is a

Accepted Answer

A)  model for population growth that incorporates the concept of carrying capacity.
B)  graph that plots an individual's likelihood of being alive as a function of age.
C)  graph that plots an individual's likelihood of reproducing as a function of age.
D)  graph that shows the effect of predation on a prey population.

Question 6

A tidal wave wipes out the entire population of mice living on an island.This is an example of

Accepted Answer

A)  the effects of abiotic factors.
B)  a density- dependent effect.
C)  Type III survivorship.
D)  the interaction between density- dependent and abiotic factors.

Question 7

Which of the following statements about human population growth is true?

Accepted Answer

A)  Human population size has increased faster and faster throughout human history.
B)  Human population size on Earth today is at equilibrium.
C)  Demographic transition is a transition from high birth rates and high death rates to low birth rates and low death rates.
D)  During a demographic transition,birth rates typically drop first due to the availability of reliable contraception. C

Question 8

The density of Douglas firs in an old- growth forest is estimated by counting the Douglas firs in four sample plots of 1 hectare each.The number of fir trees in the plots is 10,12,7,and 11,respectively.What is the estimated density of firs in the forest?

Accepted Answer

A)  20 trees per hectare
B)  10 trees per hectare
C)  25 trees per hectare
D)  5 trees per hectare B

Question 9

The death by bubonic plague of about one- third of Europe's population during the fourteenth century is a good example of

Accepted Answer

A)  abiotic factors limiting population size.
B)  a density- independent effect.
C)  a density- dependent effect.
D)  carrying capacity. C

Question 10

A population of fungi in a yard produces 10 mushrooms in year 1,20 in year 2,and 40 in year 3.If this trend continues,by year 5 there will be mushrooms.

Accepted Answer

A)  40
B)  80
C)  320
D)  160

Question 11

The world human population

Accepted Answer

A)  is growing faster now than ever before.
B)  has leveled off at carrying capacity.
C)  is growing,but at a slower rate than in the last century.
D)  is starting to decline.

Question 12

The maximum number of individuals a habitat can support is called its

Accepted Answer

A)  reproductive potential.
B)  density- dependent factor.
C)  carrying capacity.
D)  community size.

Question 13

Which of the following statements about human demographic trends is true?

Accepted Answer

A)  After 1950,mortality rates increased rapidly in most developing countries.
B)  A human population in which women reproduce at an later age will experience slower population growth.
C)  As women's status and education increase,they choose to have more children.
D)  The movement from high birth rates and low death rates to low birth rates and high death rates is called the demographic transition.

Question 14

What is the age structure of a population?

Accepted Answer

A)  the difference in the age distribution of a population at two different points in time
B)  the proportion of individuals in different age groups
C)  the curve that results when the likelihood of being alive is plotted as a function of age
D)  the curve that results when the likelihood of dying is plotted as a function of age

Question 15

A test tube is inoculated with 1 × 103 cells of a bacterial strain that has a generation time of 30 minutes.The carrying capacity of the test tube for this strain is 6 × 109 cells.What will the bacterial population be after 90 minutes of culturing?

Accepted Answer

A)  1 × 1012 
B)  1 × 109 
C)  3 × 103 
D)  8 × 103

Question 16

Which of the following is most clearly a case of density- dependent population regulation?

Accepted Answer

A)  the occurrence of rainstorms for an opportunistic desert annual
B)  the first hard frost of fall for a population of annual morning glory vines
C)  the summer drying of savanna grass for an insect that feeds on grass sap
D)  a dangerous new flu strain that is transmitted among humans by sneezing

Question 17

If an ecosystem has a carrying capacity of 1,000 individuals for a given species,and 2,000 individuals of that species are present,we can predict that the population

Accepted Answer

A)  size will slowly increase.
B)  size will remain at equilibrium.
C)  size will decrease.
D)  will show a clumped dispersion pattern.

Question 18

A Type I survivorship curve is associated with which of the following life history traits?

Accepted Answer

A)  infant mortality being much greater than adult mortality
B)  large numbers of offspring being produced
C)  a short life span for most individuals
D)  parents providing extended care for their young

Question 19

An ecologist hypothesizes that predation by a particular owl species is the major factor controlling the population of a particular rabbit species.The first step in testing this hypothesis would be to determine

Accepted Answer

A)  whether the owls eat the rabbits.
B)  what food the rabbits eat.
C)  whether populations of the rabbit that live outside the range of the owl have higher population densities.
D)  to which diseases the rabbit population is subject.

Question 20

Assume that there are five alligators per acre in a swamp in northern Florida.This is a measure of the alligator population's

Accepted Answer

A)  intrinsic rate of increase.
B)  dispersion.
C)  range.
D)  density.

Exam 36: Population Ecology

Which of the following is an example of a population?

Correct AnswerverifiedShow Answer

An r- selected species typically

Correct AnswerverifiedShow Answer

Which of the following organisms best illustrates K- selection?

Correct AnswerverifiedShow Answer

Which of the following will likely decrease a population's size?

Correct AnswerverifiedShow Answer

A survivorship curve is a

Correct AnswerverifiedShow Answer

A tidal wave wipes out the entire population of mice living on an island.This is an example of

Correct AnswerverifiedShow Answer

Which of the following statements about human population growth is true?

Correct AnswerverifiedC

The density of Douglas firs in an old- growth forest is estimated by counting the Douglas firs in four sample plots of 1 hectare each.The number of fir trees in the plots is 10,12,7,and 11,respectively.What is the estimated density of firs in the forest?

Correct AnswerverifiedB

The death by bubonic plague of about one- third of Europe's population during the fourteenth century is a good example of

Correct AnswerverifiedC

A population of fungi in a yard produces 10 mushrooms in year 1,20 in year 2,and 40 in year 3.If this trend continues,by year 5 there will be mushrooms.

Correct AnswerverifiedShow Answer

The world human population

Correct AnswerverifiedShow Answer

The maximum number of individuals a habitat can support is called its

Correct AnswerverifiedShow Answer

Which of the following statements about human demographic trends is true?

Correct AnswerverifiedShow Answer

What is the age structure of a population?

Correct AnswerverifiedShow Answer

A test tube is inoculated with 1 × 103 cells of a bacterial strain that has a generation time of 30 minutes.The carrying capacity of the test tube for this strain is 6 × 109 cells.What will the bacterial population be after 90 minutes of culturing?

Correct AnswerverifiedShow Answer

Which of the following is most clearly a case of density- dependent population regulation?

Correct AnswerverifiedShow Answer

If an ecosystem has a carrying capacity of 1,000 individuals for a given species,and 2,000 individuals of that species are present,we can predict that the population

Correct AnswerverifiedShow Answer

A Type I survivorship curve is associated with which of the following life history traits?

Correct AnswerverifiedShow Answer

An ecologist hypothesizes that predation by a particular owl species is the major factor controlling the population of a particular rabbit species.The first step in testing this hypothesis would be to determine

Correct AnswerverifiedShow Answer

Assume that there are five alligators per acre in a swamp in northern Florida.This is a measure of the alligator population's

Correct AnswerverifiedShow Answer

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C

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