Question 1

In comparison of the white oak (left) and the cottonwood (right) age structures shown,what conclusion(s) can be drawn?

Accepted Answer

A)   The next decade will likely result in many white oaks dying off.
B)   In the next decade, many white oaks will survive, while many cottonwoods will die.
C)   Many white oaks will likely survive the next decade.
D)   The next decade will likely result in many cottonwoods dying off.
E)   Many cottonwoods will likely survive the next decade.F) A) and C)
G) C) and D)

Question 2

Emigration happens when individuals move ___ a population,while immigration happens when individuals move ___ a population.

Accepted Answer

A)   by extrapolation towards; by dispersion from
B)   into; out of
C)   due to environmental resistance within; due to carrying capacity within
D)   out of; into
E)   by dispersion through; by extrapolation at the periphery ofF) A) and B)
G) A) and C)

Question 3

Wildlife biologists use methods which ______ in order to control the brown tree snake population on Guam.

Accepted Answer

A)   anesthetize the snakes with acetominephin in rats
B)   release sterilized males to compete with wild fertile males
C)   capture and kill the snakes, increasing death rates
D)   use specially trained dogs to prevent spread to other islands
E)   All of the answer choices are correct.F) B) and C)
G) A) and E)

Question 4

A population with a large fraction of pre-reproductive individuals is common in _____-developed countries; this population will most likely _____ in size.

Accepted Answer

A)   more; decrease
B)   more; increase
C)   less; decrease
D)   less; increaseE) A) and B)
F) B) and C)

Question 5

When exponential growth is plotted over time,an S-shaped curve emerges.

Accepted Answer

A) True 
 B)False

Question 6

Figuer:
The insets below show the age structures of India, the United States, and China.

-Based upon the population pyramid shown above,you would expect the Indian population to

Accepted Answer

A)   grow and then begin to stabilize.
B)   shrink.
C)   grow exponentially.
D)   stay constant.E) A) and D)
F) None of the above

Question 7

The brown tree snake in Guam had a ______of about 100 snakes per hectare,which is approximately equal to two American football fields.

Accepted Answer

A)   population density
B)   population distribution
C)   death rate
D)   growth rate
E)   populationF) B) and D)
G) C) and D)

Question 8

The study of the factors that influence changes in a population's size is

Accepted Answer

A)   population dynamics.
B)   population geology.
C)   population dispersion.
D)   population density.
E)   population ethology.F) C) and E)
G) C) and D)

Question 9

An ecologist catches 100 frogs from a pond,marks them,and releases them back into the pond.After a few days,another 100 frogs are captured and 10 have the marks on them.How many frogs are in the pond?

Accepted Answer

A)   100
B)   900
C)   10,000
D)   90
E)   1000F) A) and B)
G) D) and E)

Question 10

In a population,the difference between the birth rate and the death rate is termed the

Accepted Answer

A)   population density determining factor.
B)   J-shaped population curve.
C)   population dispersion factor.
D)   S-shaped population curve.
E)   per capita rate of increase.F) B) and D)
G) None of the above

Question 11

If a deer herd has a population of N = 1000,and a per capita rate of increase of 10% (r = 0.1 per year) ,how much will the deer population grow in a year,if resources are unlimited?

Accepted Answer

A)   50
B)   500
C)   1000
D)   100
E)   10F) B) and C)
G) None of the above

Question 12

Atlantic mollies of the species Poecilia mexicana live in habitats that make multiple collection trips difficult,yet they live in populations of many small individuals.What variable was measured to estimate and compare their life histories among different conditions?

Accepted Answer

A)   ages of the collected male and female Atlantic mollies
B)   embryo number
C)   embryo number and embryo biomass
D)   numbers and sizes of the collected male and female Atlantic mollies
E)   embryo biomassF) B) and E)
G) A) and B)

Question 13

How is the adaptation of investing more energy in producing large offspring beneficial in the Atlantic mollies?

Accepted Answer

A)   Larger-sized offspring can migrate more easily among the stressful and non-stressful environments.
B)   All of the answer choices are correct.
C)   Larger-sized offspring can more quickly mature to reproductive age.
D)   Larger-sized offspring increases swimming ability for accessing food in toxic or dark conditions.
E)   Larger-sized offspring allow greater ability to avoid predation by other species.F) A) and E)
G) A) and D)

Question 14

Atlantic mollies of the species Poecilia mexicana are found in the habitat(s) of

Accepted Answer

A)   isolated desert pools left from hurricane storm surges.
B)   estuaries where saltwater and freshwater mix.
C)   All of the answer choices are correct.
D)   coastal tidal pools and coral reefs.
E)   streams and cave waters with clean water and H2S poisonous molecules.F) B) and E)
G) D) and E)

Question 15

The United Nations issued a highest projection of the global human population in 2100 to be 15.8 billion people.

Accepted Answer

A) True 
 B)False

Question 16

Why are the leading causes of death in high-income countries heart disease,stroke,and cancer,while in low-income countries infectious diseases are the leading causes of death?

Accepted Answer

A)   The population density in high-income countries is clustered.
B)   The population density in high-income countries is larger.
C)   Access to sanitation, vaccines, and antibiotics is greater in high-income countries.
D)   The ecological footprint in high-income countries is larger.
E)   There are genetic differences between populations.F) A) and B)
G) B) and E)

Question 17

In this graph of yellow-eyed penguins,the data indicate that

Accepted Answer

A)   Reproductive age of the yellow-eyed penguins is three years.
B)   All of the answer choices are correct.
C)   Most of the yellow-eyed penguins die in their first year of life.
D)   10% of the yellow-eyed penguins live to eleven years of age.
E)   Just less than 30% of the yellow-eyed penguins survive to reproductive age.F) A) and B)
G) A) and C)

Question 18

Species with an equilibrium,or K-selected,life history strategy

Accepted Answer

A)   are short-lived.
B)   have a large number of offspring.
C)   give very little care to their offspring.
D)   reproduce at an early age.
E)   have only a few offspring.F) B) and E)
G) C) and D)

Question 19

The study of the relationships among organisms and the environment is

Accepted Answer

A)   habitology.
B)   ecology.
C)   ergonomics.
D)   ethology.
E)   geology.F) A) and B)
G) B) and D)

Question 20

The number of individuals produced per individual per unit time in a population is its _____ rate.

Accepted Answer

A)   immigration
B)   expatriation
C)   death
D)   birth
E)   emigrationF) All of the above
G) A) and E)

Exam 37: Population Ecology

In a population,the difference between the birth rate and the death rate is termed the

Correct AnswerverifiedShow Answer

Species with an equilibrium,or K-selected,life history strategy

Correct AnswerverifiedShow Answer

In comparison of the white oak (left) and the cottonwood (right) age structures shown,what conclusion(s) can be drawn?

Correct AnswerverifiedShow Answer

Emigration happens when individuals move ___ a population,while immigration happens when individuals move ___ a population.

Correct AnswerverifiedShow Answer

The United Nations issued a highest projection of the global human population in 2100 to be 15.8 billion people.

Correct AnswerverifiedShow Answer

The study of the relationships among organisms and the environment is

Correct AnswerverifiedShow Answer

If a deer herd has a population of N = 1000,and a per capita rate of increase of 10% (r = 0.1 per year) ,how much will the deer population grow in a year,if resources are unlimited?

Correct AnswerverifiedShow Answer

Figuer: The insets below show the age structures of India, the United States, and China. -Based upon the population pyramid shown above,you would expect the Indian population to

Correct AnswerverifiedShow Answer

The study of the factors that influence changes in a population's size is

Correct AnswerverifiedShow Answer

Why are the leading causes of death in high-income countries heart disease,stroke,and cancer,while in low-income countries infectious diseases are the leading causes of death?

Correct AnswerverifiedShow Answer

Atlantic mollies of the species Poecilia mexicana are found in the habitat(s) of

Correct AnswerverifiedShow Answer

Atlantic mollies of the species Poecilia mexicana live in habitats that make multiple collection trips difficult,yet they live in populations of many small individuals.What variable was measured to estimate and compare their life histories among different conditions?

Correct AnswerverifiedShow Answer

A population with a large fraction of pre-reproductive individuals is common in _____-developed countries; this population will most likely _____ in size.

Correct AnswerverifiedShow Answer

In this graph of yellow-eyed penguins,the data indicate that

Correct AnswerverifiedShow Answer

An ecologist catches 100 frogs from a pond,marks them,and releases them back into the pond.After a few days,another 100 frogs are captured and 10 have the marks on them.How many frogs are in the pond?

Correct AnswerverifiedShow Answer

When exponential growth is plotted over time,an S-shaped curve emerges.

Correct AnswerverifiedShow Answer

Wildlife biologists use methods which ______ in order to control the brown tree snake population on Guam.

Correct AnswerverifiedShow Answer

The number of individuals produced per individual per unit time in a population is its _____ rate.

Correct AnswerverifiedShow Answer

How is the adaptation of investing more energy in producing large offspring beneficial in the Atlantic mollies?

Correct AnswerverifiedShow Answer

The brown tree snake in Guam had a ______of about 100 snakes per hectare,which is approximately equal to two American football fields.

Correct AnswerverifiedShow Answer

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Emigration happens when individuals move _ a population,while immigration happens when individuals move _ a population.

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A population with a large fraction of pre-reproductive individuals is common in _-developed countries; this population will most likely _ in size.

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