Question 1

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. 
A)  flat. 
B)  J-shaped. 
C)  V-shaped. 
D)  S-shaped. 
E)  W-shaped.

Question 2

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. 
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.

Question 3

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. 
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.

Question 4

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

Accepted Answer

A) True 
 B)False

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. 
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.

Question 6

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. 
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.

Question 7

An intimate relationship between two different species is called

Accepted Answer

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

Question 8

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. 
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.

Question 9

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. 
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.

Question 10

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

Question 11

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. 
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 12

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)  0.75 
A)  0.7 
B)  0.5 
C)  0.2 
D)  0.3 
E)  0.75

Question 13

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. 
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 14

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

Question 15

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

Question 16

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. 
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.

Question 17

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

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

Question 19

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

Question 20

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. 
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.

Exam 34: Population and Community Ecology

The human growth curve is best described as being

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

Age structure diagrams with a broad base suggest that

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

Which statement about parasitism is true?

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

An intimate relationship between two different species is called

Biotic potential depends on

Replacement reproduction cannot bring about zero population growth unless

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

Which of the following describes a type III survivorship curve?

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.

An example of commensalism is

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

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

Which of the following is a form of environmental resistance?

The division of feeding niches in a community is known as

The role a species plays in the community is called its

Ecology is best defined as the study of

The Study of Life

The Molecules of Cells

Cell Structure and Function

Membrane Structure and Function

Cell Division

Metabolism: Energy and Enzymes

Cellular Respiration

Photosynthesis

Plant Organization and Function

Plant Reproduction and Responses

Human Organization

Cardiovascular System

Lymphatic and Immune Systems

Digestive System and Nutrition

Respiratory System

Urinary System and Excretion

Nervous System

Senses

Musculoskeletal System

Endocrine System

Reproductive System

Development and Aging

Patterns of Gene Inheritance

Chromosomal Basis of Inheritance

Dna Structure and Gene Expression

Biotechnology and Genomics

Evolution of Life

Microbiology

Protists and Fungi

Plants

Animals: the Invertebrates

Animals: Chordates and Vertebrates

Behavioral Ecology

Nature of Ecosystems

Major Ecosystems of the Biosphere

Conservation Biology

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