Question 1

The demographic transition,where population growth slows in developed countries,is due to a(n)

Accepted Answer

A)  decreased death rate followed by a decreased birthrate.
B)  decreased death rate followed by increased birthrate.
C)  increased death rate followed by a decreased birthrate.
D)  increased death rate followed by increased birthrate.
E)  loss of a large number of members of the child-bearing age population.

Question 2

Replacement reproduction cannot bring about zero population growth unless

Accepted Answer

A)  all diseases such as cholera,typhus,and diphtheria are brought under control.
B)  there are many fatalities due to a world war.
C)  there are as many older women leaving the reproductive years as there are younger women entering them.
D)  there are more older women leaving the reproductive years than there are younger women entering them.
E)  there are fewer older women leaving the reproductive years than there are younger women entering them. C

Question 3

A form of symbiosis in which one participant benefits and the other apparently is not benefited nor harmed is

Accepted Answer

A)  commensalism.
B)  parasitism.
C)  mutualism.
D)  coevolution.
E)  symbiosis.

Question 4

The study of the interrelationships of plants and animals with each other and with their environment is known as

Accepted Answer

A)  a trophic level.
B)  a food web.
C)  a habitat.
D)  a biosphere.
E)  ecology.

Question 5

Which of the following is NOT true?

Accepted Answer

A)  Many MDCs have a stabilized age structure diagram.
B)  Most LDCs have a youthful age structure diagram.
C)  The quicker the replacement reproduction is achieved,the sooner the zero population growth results.
D)  The human population growth curve is exponential.
E)  As the human population increases in size,less energy but more material will be consumed.

Question 6

There are two organisms with overlapping ranges and filling a similar niche.We find that where their niches overlap,there is twice the competition for resources.This leads to

Accepted Answer

A)  speciation.
B)  hypervolume.
C)  competitive exclusion.
D)  total extinction of one species.
E)  a switch in habitat for one of the organisms. C

Question 7

Consider the life of the praying mantis.The large predatory female lays several hundred eggs in a foam mass in the fall.The young are most vulnerable when they emerge in the spring,but the few that survive spread out over the countryside and,if they find a mate,lay eggs the following fall.Which type of survivorship curve does this represent?

Accepted Answer

A)  type I
B)  type II
C)  type III
D)  exponential growth followed by a decline from resource depletion
E)  maximal exponential growth and minimal use of carrying capacity

Question 8

Secondary succession will start with bare ground that is lacking any type of soil.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following does not impact an organism's biotic potential?

Accepted Answer

A)  number of offspring per reproduction
B)  chances of survival until age of reproduction
C)  age at which reproduction begins
D)  how often each individual reproduces
E)  the rate of immigration into an area

Question 10

A scientist observes a population of grasshoppers in a farmer's field several times over the summer.She notices that after each application of an insecticide the grasshopper population increases to its pre-pesticide levels very rapidly and that the population never goes near zero at any time.The scientist's results indicate the grasshopper population is probably

Accepted Answer

A)  in the lag phase.
B)  in the exponential growth phase.
C)  in the deceleration phase.
D)  in the stable equilibrium phase.
E)  at carrying capacity.

Question 11

Ecology is best defined as the study of

Accepted Answer

A)  populations.
B)  the rate of population changes.
C)  communities.
D)  how populations are restricted by environmental resistance.
E)  organisms as they interact with other organisms and with their physical surroundings.

Question 12

Which of the following describes a type II survivorship curve (drawn by plotting the number of individuals in a given population alive at the beginning of each age interval) ?

Accepted Answer

A)  Most individuals die of old age.
B)  Many individuals die early in life.
C)  Individuals die at a constant rate throughout time.
D)  Most individuals die during their reproductive years.
E)  Most individuals die before old age,but after their reproductive years.

Question 13

Which of these is most likely true?

Accepted Answer

A)  The less developed countries will always have a high growth rate with no accompanying problems.
B)  The growth rate will decline only when the less developed countries are industrialized as much as the more developed countries.
C)  A good family planning program can help the growth rate decline even if the country is not yet industrialized.
D)  The less developed countries already have a low growth rate.
E)  The growth rate of more developed countries contributes more to world population growth.

Question 14

An example of commensalism is

Accepted Answer

A)  mycorrhizal fungal roots on the roots of plants.
B)  ants living on the bullhorn acacia tree.
C)  termites with protozoa in their digestive tracts.
D)  flowering plants and their pollinators.
E)  clown fishes in sea anemones.

Question 15

Interaction between two species as both attempt to use the same environmental resources is

Accepted Answer

A)  competition.
B)  a community.
C)  an ecosystem.
D)  predation.
E)  symbiosis.

Question 16

Similar species occupying slightly different niches in the same community is shown by

Accepted Answer

A)  the presence of carp in polluted waters in the United States.
B)  fluctuation of the snowshoe hare and lynx populations in Canada.
C)  competition between two species of barnacles in Scotland,resulting in one living in the intertidal zone and the other living below this species.
D)  removal of a starfish species from intertidal communities in Washington.
E)  killing dingoes in Australia or coyotes in the American West.

Question 17

A population of 1,000 mice living in a barn loses one-half of its members when a sudden virus spreads through the population.This population has undergone a reduction in population size due to

Accepted Answer

A)  an intrinsic factor.
B)  a density-independent factor.
C)  a density-dependent factor.
D)  natural selection.
E)  an opportunistic control.

Question 18

If the growth rate of a population increases,the doubling time

Accepted Answer

A)  increases.
B)  decreases.
C)  remains the same.
D)  depends on the amount of natural resources.
E)  is not related to growth rate increase. B

Question 19

There are two plowed fields that are each one acre and one mile apart with a wood surrounding one and the other surrounded by a pasture; they have the same soil composition and climate.In the first field,as succession begins,the pioneer species are pine trees and shrubs.In the second field,the pioneer species are weeds and shrubs.This provides evidence for which model of succession?

Accepted Answer

A)  the facilitation model
B)  the tolerance model
C)  the inhibition model
D)  an opportunistic model
E)  the climax model

Question 20

When the number of births exceeds the number of deaths,this results in

Accepted Answer

A)  population growth.
B)  biotic potential.
C)  environmental resistance.
D)  carrying capacity.
E)  doubling time.

Exam 34: Population Ecology

The demographic transition,where population growth slows in developed countries,is due to a(n)

Correct Answer
verified

Replacement reproduction cannot bring about zero population growth unless

Correct Answer
verified
C

A form of symbiosis in which one participant benefits and the other apparently is not benefited nor harmed is

Correct Answer
verified

The study of the interrelationships of plants and animals with each other and with their environment is known as

Correct Answer
verified

Which of the following is NOT true?

Correct Answer
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There are two organisms with overlapping ranges and filling a similar niche.We find that where their niches overlap,there is twice the competition for resources.This leads to

Correct Answer
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C

Correct Answer
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Secondary succession will start with bare ground that is lacking any type of soil.

Correct Answer
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Which of the following does not impact an organism's biotic potential?

Correct Answer
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Correct Answer
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Ecology is best defined as the study of

Correct Answer
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Which of the following describes a type II survivorship curve (drawn by plotting the number of individuals in a given population alive at the beginning of each age interval) ?

Correct Answer
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Which of these is most likely true?

Correct Answer
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An example of commensalism is

Correct Answer
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Interaction between two species as both attempt to use the same environmental resources is

Correct Answer
verified

Similar species occupying slightly different niches in the same community is shown by

Correct Answer
verified

A population of 1,000 mice living in a barn loses one-half of its members when a sudden virus spreads through the population.This population has undergone a reduction in population size due to

Correct Answer
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If the growth rate of a population increases,the doubling time

Correct Answer
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B

Correct Answer
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When the number of births exceeds the number of deaths,this results in

Correct Answer
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Exam 34: Population Ecology

The demographic transition,where population growth slows in developed countries,is due to a(n)

Correct AnswerverifiedShow Answer

Replacement reproduction cannot bring about zero population growth unless

Correct AnswerverifiedC

A form of symbiosis in which one participant benefits and the other apparently is not benefited nor harmed is

Correct AnswerverifiedShow Answer

The study of the interrelationships of plants and animals with each other and with their environment is known as

Correct AnswerverifiedShow Answer

Which of the following is NOT true?

Correct AnswerverifiedShow Answer

There are two organisms with overlapping ranges and filling a similar niche.We find that where their niches overlap,there is twice the competition for resources.This leads to

Correct AnswerverifiedC

Correct AnswerverifiedShow Answer

Secondary succession will start with bare ground that is lacking any type of soil.

Correct AnswerverifiedShow Answer

Which of the following does not impact an organism's biotic potential?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Ecology is best defined as the study of

Correct AnswerverifiedShow Answer

Which of the following describes a type II survivorship curve (drawn by plotting the number of individuals in a given population alive at the beginning of each age interval) ?

Correct AnswerverifiedShow Answer

Which of these is most likely true?

Correct AnswerverifiedShow Answer

An example of commensalism is

Correct AnswerverifiedShow Answer

Interaction between two species as both attempt to use the same environmental resources is

Correct AnswerverifiedShow Answer

Similar species occupying slightly different niches in the same community is shown by

Correct AnswerverifiedShow Answer

A population of 1,000 mice living in a barn loses one-half of its members when a sudden virus spreads through the population.This population has undergone a reduction in population size due to

Correct AnswerverifiedShow Answer

If the growth rate of a population increases,the doubling time

Correct AnswerverifiedB

Correct AnswerverifiedShow Answer

When the number of births exceeds the number of deaths,this results in

Correct AnswerverifiedShow Answer

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C

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C

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B

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