Question 1

Competitive exclusion is a result of:

Accepted Answer

A)  interspecific competition. 
B)  intraspecific competition. 
C)  character displacement. 
D)  succession. 
E)  community complexity. 
A)  interspecific competition. 
B)  intraspecific competition. 
C)  character displacement. 
D)  succession. 
E)  community complexity.

Question 2

Keystone species:

Accepted Answer

A)  are always symbionts. 
B)  are typically not the most abundant species in the community. 
C)  illustrate secondary succession. 
D)  always form the base of a food chain. 
E)  are only found in tropical communities. 
A)  are always symbionts. 
B)  are typically not the most abundant species in the community. 
C)  illustrate secondary succession. 
D)  always form the base of a food chain. 
E)  are only found in tropical communities.

Question 3

Traditionally, most ecologists have assumed that community stability is a consequence of:

Accepted Answer

A)  competition. 
B)  predation. 
C)  community complexity. 
D)  the relative size of realized niches among species. 
E)  disease. 
A)  competition. 
B)  predation. 
C)  community complexity. 
D)  the relative size of realized niches among species. 
E)  disease.

Question 4

Which organisms may be a keystone species in a tropical rain forest?

Accepted Answer

A)  gray wolves 
B)  fruit-eating bats 
C)  poison arrow frogs 
D)  fig trees 
E)  fruit-eating monkeys 
A)  gray wolves 
B)  fruit-eating bats 
C)  poison arrow frogs 
D)  fig trees 
E)  fruit-eating monkeys

Question 5

One reason that the realized niche and fundamental niche are not typically the same is:

Accepted Answer

A)  limiting resources. 
B)  reproductive potential. 
C)  extinction event.s 
D)  species diversity. 
E)  species sparsity. 
A)  limiting resources. 
B)  reproductive potential. 
C)  extinction event.s 
D)  species diversity. 
E)  species sparsity.

Question 6

The community found on a rotting log would include:

Accepted Answer

A)  sunlight. 
B)  rainwater. 
C)  bacteria. 
D)  gases. 
E)  minerals. 
A)  sunlight. 
B)  rainwater. 
C)  bacteria. 
D)  gases. 
E)  minerals.

Question 7

Explain the ecological significance of limiting resources, using three specific examples in your discussion.

Accepted Answer

A limiting resource is an environmental

Question 8

Humans have small mites that live in hair follicles and oil glands around the nose and eyelashes. What would you need to know to classify them as exhibiting mutualism, commensalism, or parasitism?

Accepted Answer

Concepts to Consider: In mutualism, bene

Question 9

Ecologist James H. Brown of the University of New Mexico has addressed species composition and richness in experiments conducted since 1977 in the Chihuahuan desert of southeastern Arizona. In one experiment, the removal of three dominant species, all kangaroo rats, from several plots resulted in an increased diversity of other rodent species. This increase was ascribed both to lowered competition for food and also to an altered habitat, because the abundance of grass species ____ after the removal of the kangaroo rats.

Accepted Answer

A)  increased 
B)  decreased 
C)  did not change 
D)  was threatened 
E)  shrunk 
A)  increased 
B)  decreased 
C)  did not change 
D)  was threatened 
E)  shrunk

Question 10

Pollution affects species diversity, thus the species richness of a highly polluted stream is ____ compared with that of a nearby pristine stream.

Accepted Answer

A)  low 
B)  high 
C)  no different 
D)  more dense 
E)  complex 
A)  low 
B)  high 
C)  no different 
D)  more dense 
E)  complex

Question 11

In a lake, a certain native species of zooplankton is found evenly distributed in the water column. After introduction of a different species of zooplankton, the native species is only found in the shallow water zone. This is most likely an illustration of:

Accepted Answer

A)  character displacement. 
B)  species richness. 
C)  primary succession. 
D)  secondary succession. 
E)  competitive exclusion. 
A)  character displacement. 
B)  species richness. 
C)  primary succession. 
D)  secondary succession. 
E)  competitive exclusion.

Question 12

The almost complete loss of the American chestnut tree to the chestnut blight fungus had ____ ecological impact on the moderately diverse Appalachian woodlands of which it was formerly a part.

Accepted Answer

A)  little 
B)  great 
C)  moderate 
D)  undetectable 
E)  detectable 
A)  little 
B)  great 
C)  moderate 
D)  undetectable 
E)  detectable

Question 13

The orderly replacement of one community by another is known as:

Accepted Answer

A)  character displacement. 
B)  succession. 
C)  coevolution. 
D)  the edge effect. 
E)  competitive exclusion. 
A)  character displacement. 
B)  succession. 
C)  coevolution. 
D)  the edge effect. 
E)  competitive exclusion.

Exam 54: Community Ecology

Competitive exclusion is a result of:

Keystone species:

Traditionally, most ecologists have assumed that community stability is a consequence of:

Which organisms may be a keystone species in a tropical rain forest?

One reason that the realized niche and fundamental niche are not typically the same is:

The community found on a rotting log would include:

Explain the ecological significance of limiting resources, using three specific examples in your discussion.

Humans have small mites that live in hair follicles and oil glands around the nose and eyelashes. What would you need to know to classify them as exhibiting mutualism, commensalism, or parasitism?

Pollution affects species diversity, thus the species richness of a highly polluted stream is ____ compared with that of a nearby pristine stream.

In a lake, a certain native species of zooplankton is found evenly distributed in the water column. After introduction of a different species of zooplankton, the native species is only found in the shallow water zone. This is most likely an illustration of:

The almost complete loss of the American chestnut tree to the chestnut blight fungus had ____ ecological impact on the moderately diverse Appalachian woodlands of which it was formerly a part.

The orderly replacement of one community by another is known as:

A View of Life

Atoms and Molecules the Chemical Basis of Life

The Chemistry of Life Organic Compounds

Organization of the Cell

Biological Membranes

Cell Communication

Energy and Metabolism

How Cells Make Atp Energy-Releasing Pathways

Photosynthesis Capturing Light Energy

Chromosomes, Mitosis, and Meiosis

The Basic Principles of Heredity

Dna the Carrier of Genetic Information

Gene Expression

Gene Regulation

Dna Technology and Genomics

Human Genetics and the Human Genome

Developmental Genetics

Introduction to Darwinian Evolution

Evolutionary Change in Populations

Speciation and Macroevolution

The Origin and Evolutionary History of Life

The Evolution of Primates

Understanding Diversity Systematics

Viruses and Subviral Agents

Bacteria and Archaea

Protists

Seedless Plants

Seed Plants

The Fungi

An Introduction to Animal Diversity

Sponges, Cnidarians, Ctenophores, and Protostomes

The Deuterostomes

Plant Structure Growth and Development

Leaf Structure and Function

Stem Structure and Transport

Roots and Mineral Nutrition

Reproduction in Flowering Plants

Plant Developmental Responses to External and Internal Signals

Animal Structure and Function an Introduction

Protection Support and Movement

Neural Signaling

Neural Regulation

Sensory Systems

Internal Transport

The Immune System Internal Defense

Gas Exchange

Processing Food and Nutrition

Osmoregulation and Disposal of Metabolic Wastes

Endocrine Regulation

Reproduction

Animal Development

Animal Behavior

Introduction to Ecology Population Ecology

Ecosystems and the Biosphere

Ecology and the Geography of Life

Biological Diversity and Conservation Biology

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