Question 1

A community whose species are not replaced by other species is classified as a _______ community.

Accepted Answer

The answer of A community whose species are not replaced...

Question 2

Food webs, like the one in the figure below, help biologists predict the impact to a community that changes in species abundance might produce.  
After studying the food web above, select a reasonable outcome following the complete disappearance of leopard seals.

Accepted Answer

A)  Killer whales may decline since they eat leopard seals 
B)  Chilean seas bass may increase since one of their primary predators is gone. 
C)  Baleen whales will increase as more krill becomes available 
D)  Sperm whales may decline as squid become less abundant. 
A)  Killer whales may decline since they eat leopard seals 
B)  Chilean seas bass may increase since one of their primary predators is gone. 
C)  Baleen whales will increase as more krill becomes available 
D)  Sperm whales may decline as squid become less abundant.

Question 3

A _______ is a single sequence of who eats whom in a community.

Accepted Answer

The answer of A _______ is a single sequence of...

Question 4

In which of the following situations would secondary rather than primary succession be most likely to occur?

Accepted Answer

A)  on an island that has just risen out of the ocean 
B)  on bare ground exposed by the retreat of a glacier 
C)  on the surface of recently cooled lava 
D)  in a forest that had burned to bare ground 
A)  on an island that has just risen out of the ocean 
B)  on bare ground exposed by the retreat of a glacier 
C)  on the surface of recently cooled lava 
D)  in a forest that had burned to bare ground

Question 5

Which of the following could represent the linear flow of energy within a food web?

Accepted Answer

A)  wolves, lions, and cheetahs 
B)  grass, bushes, and trees 
C)  lettuce, rabbits, and foxes 
D)  sheep, cows, and horses 
A)  wolves, lions, and cheetahs 
B)  grass, bushes, and trees 
C)  lettuce, rabbits, and foxes 
D)  sheep, cows, and horses

Question 6

Why would a food web rather than a food chain be the preferred way to represent the movement of food through the community?

Accepted Answer

A)  Food chains are oversimplified and suggest that a consumer eats only a single food item. 
B)  Food webs place producers at the bottom while food chains place them at the top. 
C)  Food webs are based on a foundation of producers. 
D)  Actually, ecologists prefer to use food chains to describe food movements. 
A)  Food chains are oversimplified and suggest that a consumer eats only a single food item. 
B)  Food webs place producers at the bottom while food chains place them at the top. 
C)  Food webs are based on a foundation of producers. 
D)  Actually, ecologists prefer to use food chains to describe food movements.

Question 7

All natural communities consist of an equivalent number of species.

Accepted Answer

A) True 
 B)False

Question 8

The process by which communities recover from _______ is known as secondary succession.

Accepted Answer

The answer of The process by which communities recover from...

Question 9

Secondary succession is more common following a disturbance than primary succession because _____ typically remain intact.

Accepted Answer

The answer of Secondary succession is more common following a...

Question 10

Although an icon of the western United States, the horse is not a native species; horses were introduced by Spanish explorers in the early 1500s. What does the integration of the horse to the semiarid grassland communities of the Southwest suggest?

Accepted Answer

A)  The community reached its saturation point sometime before 1500. 
B)  Terrestrial communities have less definition than aquatic communities where the introduction of new species is almost always disastrous. 
C)  The establishment of the horse must have be associated with the disappearance of at least one horse-like species. 
D)  Neutral groups within the community had enough ecological flexibility that the horse was integrated without significant disruption. 
A)  The community reached its saturation point sometime before 1500. 
B)  Terrestrial communities have less definition than aquatic communities where the introduction of new species is almost always disastrous. 
C)  The establishment of the horse must have be associated with the disappearance of at least one horse-like species. 
D)  Neutral groups within the community had enough ecological flexibility that the horse was integrated without significant disruption.

Question 11

_______ are organisms that make their food from an external energy source, such as the sun.

Accepted Answer

The answer of _______ are organisms that make their food...

Question 12

Succession has a major impact on the species makeup of a community at any given point in time.

Accepted Answer

A) True 
 B)False

Question 13

Into which category would a human be assigned when eating chicken?

Accepted Answer

A)  producers. 
B)  primary consumers. 
C)  secondary consumers. 
D)  tertiary consumers. 
A)  producers. 
B)  primary consumers. 
C)  secondary consumers. 
D)  tertiary consumers.

Question 14

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

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 15

The general process by which species in a community are replaced over time is called _______.

Accepted Answer

The answer of The general process by which species in...

Question 16

If the original organisms that colonized Hawaii came from other places on Earth, why are the organisms that now live on Hawaii so different from organisms that live elsewhere on Earth?

Accepted Answer

A)  Hawaii is a relatively young land mass, so evolution continues there although it has ceased in most other places on Earth. 
B)  The organisms that live on Hawaii do not have predators, which allows them to evolve into a greater variety of life forms. 
C)  Through time, adaptation and evolution caused speciation to produce new organisms unique to Hawaii. 
D)  none of the above 
A)  Hawaii is a relatively young land mass, so evolution continues there although it has ceased in most other places on Earth. 
B)  The organisms that live on Hawaii do not have predators, which allows them to evolve into a greater variety of life forms. 
C)  Through time, adaptation and evolution caused speciation to produce new organisms unique to Hawaii. 
D)  none of the above

Question 17

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 18

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 19

Which of the following statements about communities is true?

Accepted Answer

A)  They usually have few species of organisms. 
B)  There can be complex interactions between the organisms that make up a community. 
C)  They are more abundant in temperate areas. 
D)  They are made up of mammal species only. 
A)  They usually have few species of organisms. 
B)  There can be complex interactions between the organisms that make up a community. 
C)  They are more abundant in temperate areas. 
D)  They are made up of mammal species only.

Question 20

A _______ species has, relative to its own abundance, a large impact on the type and abundance of other species in its community.

Accepted Answer

The answer of A _______ species has, relative to its...

Exam 36: Communities of Organisms

A community whose species are not replaced by other species is classified as a _______ community.

Food webs, like the one in the figure below, help biologists predict the impact to a community that changes in species abundance might produce. After studying the food web above, select a reasonable outcome following the complete disappearance of leopard seals.

A _______ is a single sequence of who eats whom in a community.

In which of the following situations would secondary rather than primary succession be most likely to occur?

Which of the following could represent the linear flow of energy within a food web?

Why would a food web rather than a food chain be the preferred way to represent the movement of food through the community?

All natural communities consist of an equivalent number of species.

The process by which communities recover from _______ is known as secondary succession.

Secondary succession is more common following a disturbance than primary succession because _____ typically remain intact.

Although an icon of the western United States, the horse is not a native species; horses were introduced by Spanish explorers in the early 1500s. What does the integration of the horse to the semiarid grassland communities of the Southwest suggest?

_______ are organisms that make their food from an external energy source, such as the sun.

Succession has a major impact on the species makeup of a community at any given point in time.

Into which category would a human be assigned when eating chicken?

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

The general process by which species in a community are replaced over time is called _______.

If the original organisms that colonized Hawaii came from other places on Earth, why are the organisms that now live on Hawaii so different from organisms that live elsewhere on Earth?

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

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?

Which of the following statements about communities is true?

A _______ species has, relative to its own abundance, a large impact on the type and abundance of other species in its community.

The Nature of Science and the Characteristics of Life

Organizing the Diversity of Life

Major Groups of Living Organisms

Chemical Building Blocks

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

DNA

From Gene to Protein

Control of Gene Expression

DNA Technology

How Evolution Works

Evolution of Populations

Adaptation and Speciation

The Evolutionary History of Life

Maintaining the Internal Environment

Animal Nutrition and Digestion

Gas Exchange

The Circulatory System

Animal Hormones

The Nervous System

Sensing the Environment

Skeletons, Muscles, and Movement

Defenses against Disease

Reproduction and Development

Animal Behavior

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

The Biosphere

Growth of Populations

Interactions among Organisms

Ecosystems

Global Change

Biodiversity and People

Cancer: Cell Division Out of Control

Harnessing the Human Genome

Humans and Evolution

Smoking--Beyond Lung Cancer

Feeding a Hungry Planet

Building a Sustainable Society

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