Question 1

Replacement reproduction cannot bring about zero population growth unless

Accepted Answer

A)   all diseases such as cholera, typhus, and diphtheria are eradicated.
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.F) A) and C)
G) B) and E)

Question 2

In a population of 150 organisms, over a six-month period, there are 75 births and 30 deaths. Calculate the growth rate for those six months.

Accepted Answer

A)   0.7
B)   0.5
C)   0.2
D)   0.3
E)   0.75F) A) and D)
G) D) and E)

Question 3

An intimate relationship between two different species is called

Accepted Answer

A)   competition.
B)   exclusion.
C)   mimicry.
D)   predation.
E)   symbiosis.F) A) and D)
G) D) and E)

Question 4

Age structure diagrams with a broad base suggest that

Accepted Answer

A)   the population will continue to grow for some time.
B)   environmental resistance is preventing population growth.
C)   the biotic potential is decreasing.
D)   many individuals are migrating into the population.
E)   there are many older individuals in a population.F) A) and B)
G) All of the above

Question 5

Which statement about parasitism is true?

Accepted Answer

A)   The host is generally smaller than the parasite.
B)   Parasites always kill the host.
C)   All parasites require a single host for their life cycle.
D)   There are examples of parasites in every kingdom of life.
E)   All parasites will remain attached to their host for the entire life span of the host.F) B) and D)
G) A) and D)

Question 6

The human growth curve is best described as being

Accepted Answer

A)   flat.
B)   J-shaped.
C)   V-shaped.
D)   S-shaped.
E)   W-shaped.F) A) and E)
G) None of the above

Question 7

The demographic transition, where population growth slows in developed countries, may be attributed at least in part to

Accepted Answer

A)   socialization.
B)   sensitivity.
C)   an increase in family size.
D)   better medical care.
E)   education.F) A) and C)
G) A) and B)

Question 8

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.F) A) and B)
G) D) and E)

Question 9

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.F) C) and D)
G) A) and E)

Question 10

A small marine amphipod has recently been discovered that carries another organism on its back. The "backpack" organism tastes bad. If a fish ingests the pair, it immediately spits them back out. If the amphipod is alone, however, it is readily eaten and swallowed. There is no apparent benefit in this relationship for the "backpack" organism, which appears to be neither helped nor harmed. This is therefore a case of

Accepted Answer

A)   mutualism.
B)   parasitism.
C)   commensalism.
D)   competitive exclusion.
E)   predation.F) B) and D)
G) C) and E)

Question 11

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.F) A) and B)
G) B) and D)

Question 12

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)   the interactions between organisms and with their physical surroundings.F) A) and B)
G) B) and C)

Question 13

The division of feeding niches in a community is known as

Accepted Answer

A)   competitive exclusion.
B)   resource partitioning.
C)   predation.
D)   hybridization.
E)   competition.F) A) and D)
G) B) and C)

Question 14

Which of the following describes a type III survivorship curve?

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.F) None of the above
G) C) and D)

Question 15

Which of the following is a form of environmental resistance?

Accepted Answer

A)   limited food supply
B)   accumulation of waste products
C)   predation
D)   limited living space
E)   All of the answer choices describe environmental resistance factors.F) A) and C)
G) B) and D)

Question 16

In a mutualistic relationship, one species benefits while the other is harmed.

Accepted Answer

A) True 
 B)False

Question 17

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 young adults.F) A) and B)
G) C) and D)

Question 18

The role a species plays in the community is called its

Accepted Answer

A)   habitat.
B)   ecological niche.
C)   biotic role.
D)   abiotic role.
E)   ecology.F) A) and B)
G) C) and D)

Question 19

Which of the following impacts 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)   All of the answer choices describe factors that can affect the biotic potential of an organism.F) All of the above
G) B) and D)

Question 20

Biotic potential depends on

Accepted Answer

A)   the number of offspring per reproduction.
B)   how often each individual reproduces.
C)   chances of survival until the age of reproduction.
D)   the age at which reproduction begins.
E)   All of the answer choices describe factors that affect biotic potential.F) C) and D)
G) D) and E)

Exam 34: Population and Community Ecology

Ecology is best defined as the study of

Correct Answer
verified

In a population of 150 organisms, over a six-month period, there are 75 births and 30 deaths. Calculate the growth rate for those six months.

Correct Answer
verified

An example of commensalism is

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
verified

Which of the following is a form of environmental resistance?

Correct Answer
verified

The division of feeding niches in a community is known as

Correct Answer
verified

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

Correct Answer
verified

Which of the following impacts an organism's biotic potential?

Correct Answer
verified

Age structure diagrams with a broad base suggest that

Correct Answer
verified

The demographic transition, where population growth slows in developed countries, may be attributed at least in part to

Correct Answer
verified

Which statement about parasitism is true?

Correct Answer
verified

The role a species plays in the community is called its

Correct Answer
verified

Which of the following describes a type III survivorship curve?

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Biotic potential depends on

Correct Answer
verified

Replacement reproduction cannot bring about zero population growth unless

Correct Answer
verified

An intimate relationship between two different species is called

Correct Answer
verified

In a mutualistic relationship, one species benefits while the other is harmed.

Correct Answer
verified

The human growth curve is best described as being

Correct Answer
verified

Exam 34: Population and Community Ecology

Ecology is best defined as the study of

Correct AnswerverifiedShow Answer

In a population of 150 organisms, over a six-month period, there are 75 births and 30 deaths. Calculate the growth rate for those six months.

Correct AnswerverifiedShow Answer

An example of commensalism is

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

Which of the following is a form of environmental resistance?

Correct AnswerverifiedShow Answer

The division of feeding niches in a community is known as

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following impacts an organism's biotic potential?

Correct AnswerverifiedShow Answer

Age structure diagrams with a broad base suggest that

Correct AnswerverifiedShow Answer

The demographic transition, where population growth slows in developed countries, may be attributed at least in part to

Correct AnswerverifiedShow Answer

Which statement about parasitism is true?

Correct AnswerverifiedShow Answer

The role a species plays in the community is called its

Correct AnswerverifiedShow Answer

Which of the following describes a type III survivorship curve?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Biotic potential depends on

Correct AnswerverifiedShow Answer

Replacement reproduction cannot bring about zero population growth unless

Correct AnswerverifiedShow Answer

An intimate relationship between two different species is called

Correct AnswerverifiedShow Answer

In a mutualistic relationship, one species benefits while the other is harmed.

Correct AnswerverifiedShow Answer

The human growth curve is best described as being

Correct AnswerverifiedShow Answer

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