Question 1

How do ecological communities change over time?

Accepted Answer

A)  Interactions between and among species may cause changes in ecological communities over time. 
B)  Keystone species typically become the most common species within an ecological community. 
C)  Species richness typically declines as one species outcompetes all other species. 
D)  Ecological communities are defined at a given point in time; any change leads to reclassification of the community. 
A)  Interactions between and among species may cause changes in ecological communities over time. 
B)  Keystone species typically become the most common species within an ecological community. 
C)  Species richness typically declines as one species outcompetes all other species. 
D)  Ecological communities are defined at a given point in time; any change leads to reclassification of the community.

Question 2

One of the factors governing diversity within a community is species ________,which is defined as the total number of different species living within that community.

Accepted Answer

The answer of One of the factors governing diversity within...

Question 3

The relationship between house pets and people would be best described as

Accepted Answer

A)  parasitic. 
B)  mutualistic. 
C)  predatorial. 
D)  competitive. 
A)  parasitic. 
B)  mutualistic. 
C)  predatorial. 
D)  competitive.

Question 4

A species of bat is removed from a community after it is hunted to extinction.Within two years scientists notice seeds from several plants are no longer germinating.The bat was a

Accepted Answer

A)  community-defining species. 
B)  keystone species. 
C)  primary consumer. 
D)  producer. 
A)  community-defining species. 
B)  keystone species. 
C)  primary consumer. 
D)  producer.

Question 5

In a typical prairie food web,energy moves from grass to grasshopper to field mouse to fox.Which organism is the secondary consumer?

Accepted Answer

A)  the grass 
B)  the grasshopper 
C)  the mouse 
D)  the fox 
A)  the grass 
B)  the grasshopper 
C)  the mouse 
D)  the fox

Question 6

The activity of predators has caused their prey to evolve a variety of protective characteristics.How are prey able to acquire new features?

Accepted Answer

A)  Prey selectively breed in order to increase the frequency of protective traits in their population. 
B)  Prey undergo population explosions that allow them to outnumber their predators and thus develop new protective features. 
C)  Prey organisms mate with other species in order to acquire new protective traits. 
D)  Natural selection acts on genetic variability already present in the prey population. 
A)  Prey selectively breed in order to increase the frequency of protective traits in their population. 
B)  Prey undergo population explosions that allow them to outnumber their predators and thus develop new protective features. 
C)  Prey organisms mate with other species in order to acquire new protective traits. 
D)  Natural selection acts on genetic variability already present in the prey population.

Question 7

Discuss the hypotheses regarding how the reintroduction of wolves to the Yellowstone ecosystem has stimulated regrowth of two native tree species,aspen and cottonwood.

Accepted Answer

Before the reintroduction of wolves to Y

Question 8

Which of the following best explains why a grass species might disappear when a meat-eating species is removed from a community?

Accepted Answer

A)  The meat-eating species protects grass directly as a way to provide cover for themselves while stalking their prey. 
B)  The grass seeds are dispersed by meat eaters who travel long distances and deposit grass seeds in their feces. 
C)  The meat-eating species eats organisms that eat grass. Removing the meat-eater allows an increase in the abundance of grass-eating organisms. 
D)  The loss of meat-eaters from a community typically causes drastic changes in the physical environment that prevent grasses from sprouting. 
A)  The meat-eating species protects grass directly as a way to provide cover for themselves while stalking their prey. 
B)  The grass seeds are dispersed by meat eaters who travel long distances and deposit grass seeds in their feces. 
C)  The meat-eating species eats organisms that eat grass. Removing the meat-eater allows an increase in the abundance of grass-eating organisms. 
D)  The loss of meat-eaters from a community typically causes drastic changes in the physical environment that prevent grasses from sprouting.

Question 9

A "keystone" is defined in masonry as the stone at the top of an arch that holds the arch together.Using this definition and your knowledge of keystone species,explain how the role of a keystone species within an ecological community is analogous to the keystone within an arch.

Accepted Answer

A keystone species holds an ecological c

Question 10

Into which category would a human be assigned when eating pepperoni pizza?

Accepted Answer

A)  producer and primary consumer 
B)  primary and secondary consumer 
C)  secondary and tertiary consumer 
D)  producer and primary consumer. 
A)  producer and primary consumer 
B)  primary and secondary consumer 
C)  secondary and tertiary consumer 
D)  producer and primary consumer.

Question 11

When removed from a community,a ________ has a far greater effect on the community than its mere numbers would have suggested.

Accepted Answer

The answer of When removed from a community,a ________ has...

Question 12

In ________ competition,species compete indirectly for a shared resource,each reducing the amount available to the other competitor.

Accepted Answer

A)  exploitative 
B)  restrictive 
C)  interference 
D)  advantageous 
A)  exploitative 
B)  restrictive 
C)  interference 
D)  advantageous

Question 13

Follicle mites live in the hair follicles of human skin.They feed on single cells but do little if any harm to the human; the mite has a stable place to live and reproduce.This is an example of ________.

Accepted Answer

The answer of Follicle mites live in the hair follicles...

Question 14

Match each term to a statement listed below.
-a bird building a nest within a tree

Accepted Answer

A) mutualism 
B) commensalism 
C) exploitation 
D) competition 
A) mutualism 
B) commensalism 
C) exploitation 
D) competition

Question 15

Which of the following choices best explains,from an ecological perspective,why there are laws that require a wildlife survey before certain building or other land-use projects may proceed?

Accepted Answer

A)  If a keystone species is found, it can be moved to another area where it will establish a new community of organisms. 
B)  If the only local habitat for a keystone species is disturbed, the entire community of populations will be affected. 
C)  If the species are surveyed before the land is used, they will all be more likely to survive the building project. 
D)  If the species are surveyed before the land is used, they will all be more easily distributed to other habitats. 
A)  If a keystone species is found, it can be moved to another area where it will establish a new community of organisms. 
B)  If the only local habitat for a keystone species is disturbed, the entire community of populations will be affected. 
C)  If the species are surveyed before the land is used, they will all be more likely to survive the building project. 
D)  If the species are surveyed before the land is used, they will all be more easily distributed to other habitats.

Question 16

In which of the following situations would succession be expected to take the longest?

Accepted Answer

A)  A volcanic island forms far from any mainland. 
B)  A forest fire burns 1,200 acres in Texas. 
C)  Sand dunes form a new island within a half mile of a mainland. 
D)  Humans log an area and then burn the remaining undergrowth. 
A)  A volcanic island forms far from any mainland. 
B)  A forest fire burns 1,200 acres in Texas. 
C)  Sand dunes form a new island within a half mile of a mainland. 
D)  Humans log an area and then burn the remaining undergrowth.

Question 17

The reintroduction of wolves to Yellowstone National Park has been followed by a marked increase in the number of aspen trees (and also an increase in their height)along with a decrease in the number of elk.What other evidence would support the hypothesis that the wolves are a keystone species in the Yellowstone ecological community? Explain your answer.

Accepted Answer

Additional evidence to support the hypot

Question 18

A(n)________ is a single sequence of who eats whom in a community.

Accepted Answer

The answer of A(n)________ is a single sequence of who...

Question 19

The removal of a keystone species from a community usually results in

Accepted Answer

A)  the death of all other community members. 
B)  the disappearance of that community. 
C)  substantial changes in the abundance of many species. 
D)  minor changes, if any. 
A)  the death of all other community members. 
B)  the disappearance of that community. 
C)  substantial changes in the abundance of many species. 
D)  minor changes, if any.

Question 20

What statement best describes a parasitic relationship?

Accepted Answer

A)  Both the parasite and the host benefit. 
B)  Only the parasite benefits; the host is harmed. 
C)  Both the parasite and the host are harmed. 
D)  Only the host benefits; the parasite is harmed. 
A)  Both the parasite and the host benefit. 
B)  Only the parasite benefits; the host is harmed. 
C)  Both the parasite and the host are harmed. 
D)  Only the host benefits; the parasite is harmed.

How do ecological communities change over time?

One of the factors governing diversity within a community is species ________,which is defined as the total number of different species living within that community.

The relationship between house pets and people would be best described as

A species of bat is removed from a community after it is hunted to extinction.Within two years scientists notice seeds from several plants are no longer germinating.The bat was a

In a typical prairie food web,energy moves from grass to grasshopper to field mouse to fox.Which organism is the secondary consumer?

The activity of predators has caused their prey to evolve a variety of protective characteristics.How are prey able to acquire new features?

Discuss the hypotheses regarding how the reintroduction of wolves to the Yellowstone ecosystem has stimulated regrowth of two native tree species,aspen and cottonwood.

Which of the following best explains why a grass species might disappear when a meat-eating species is removed from a community?

A "keystone" is defined in masonry as the stone at the top of an arch that holds the arch together.Using this definition and your knowledge of keystone species,explain how the role of a keystone species within an ecological community is analogous to the keystone within an arch.

Into which category would a human be assigned when eating pepperoni pizza?

When removed from a community,a ________ has a far greater effect on the community than its mere numbers would have suggested.

In ________ competition,species compete indirectly for a shared resource,each reducing the amount available to the other competitor.

Follicle mites live in the hair follicles of human skin.They feed on single cells but do little if any harm to the human; the mite has a stable place to live and reproduce.This is an example of ________.

Match each term to a statement listed below. -a bird building a nest within a tree

Which of the following choices best explains,from an ecological perspective,why there are laws that require a wildlife survey before certain building or other land-use projects may proceed?

In which of the following situations would succession be expected to take the longest?

A(n)________ is a single sequence of who eats whom in a community.

The removal of a keystone species from a community usually results in

What statement best describes a parasitic relationship?

The Nature of Science

Evaluating Scientific Claims

Chemistry of Life

Life Is Cellular

How Cells Work

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

What Genes Are

How Genes Work

Evidence for Evolution

Mechanisms of Evolution

Adaptation and Species

The History of Life

Bacteria and Archaea

Plants, Fungi, and Protists

Animals and Human Evolution

General Principles of Ecology

Growth of Populations

Ecosystems

Filters

Exam 20: Communities of Organisms

How do ecological communities change over time?

One of the factors governing diversity within a community is species ________,which is defined as the total number of different species living within that community.

The relationship between house pets and people would be best described as

A species of bat is removed from a community after it is hunted to extinction.Within two years scientists notice seeds from several plants are no longer germinating.The bat was a

In a typical prairie food web,energy moves from grass to grasshopper to field mouse to fox.Which organism is the secondary consumer?

The activity of predators has caused their prey to evolve a variety of protective characteristics.How are prey able to acquire new features?

Discuss the hypotheses regarding how the reintroduction of wolves to the Yellowstone ecosystem has stimulated regrowth of two native tree species,aspen and cottonwood.

Which of the following best explains why a grass species might disappear when a meat-eating species is removed from a community?

A "keystone" is defined in masonry as the stone at the top of an arch that holds the arch together.Using this definition and your knowledge of keystone species,explain how the role of a keystone species within an ecological community is analogous to the keystone within an arch.

Into which category would a human be assigned when eating pepperoni pizza?

When removed from a community,a ________ has a far greater effect on the community than its mere numbers would have suggested.

In ________ competition,species compete indirectly for a shared resource,each reducing the amount available to the other competitor.

Follicle mites live in the hair follicles of human skin.They feed on single cells but do little if any harm to the human; the mite has a stable place to live and reproduce.This is an example of ________.

Match each term to a statement listed below. -a bird building a nest within a tree

Which of the following choices best explains,from an ecological perspective,why there are laws that require a wildlife survey before certain building or other land-use projects may proceed?

In which of the following situations would succession be expected to take the longest?

A(n)________ is a single sequence of who eats whom in a community.

The removal of a keystone species from a community usually results in

What statement best describes a parasitic relationship?

The Nature of Science

Evaluating Scientific Claims

Chemistry of Life

Life Is Cellular

How Cells Work

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

What Genes Are

How Genes Work

Evidence for Evolution

Mechanisms of Evolution

Adaptation and Species

The History of Life

Bacteria and Archaea

Plants, Fungi, and Protists

Animals and Human Evolution

General Principles of Ecology

Growth of Populations

Ecosystems

Filters