Question 1

The study of how organisms interact with one another and with their nonliving environment is

Accepted Answer

A)  anatomy. 
B)  ecosystems. 
C)  ecology. 
D)  genetics. 
E)  morphology. 
A)  anatomy. 
B)  ecosystems. 
C)  ecology. 
D)  genetics. 
E)  morphology.

Question 2

Parasitism is a density- dependent population control.

Accepted Answer

A) True 
 B)False

Question 3

-According to the graph, how long does it take the population of deer that is experiencing moderate growth (r = 0.2) to reach 3,000 deer?

Accepted Answer

A)  35 years 
B)  15 years 
C)  20 years 
D)  All three populations grow at the same rate. 
E)  None of the three populations grows to 3,000. 
A)  35 years 
B)  15 years 
C)  20 years 
D)  All three populations grow at the same rate. 
E)  None of the three populations grows to 3,000.

Question 4

A population of birds migrating to winter nesting grounds is blown off course by a late- season hurricane and ends up on an island that is uninhabited by any animal species. Which of the following represents a density- independent factor that will limit the population size?

Accepted Answer

A)  Heavily wooded 
B)  Abundant fruit trees 
C)  Freshwater spring 
D)  Abundant berry bushes 
E)  Nightly temperature dropping below freezing 
A)  Heavily wooded 
B)  Abundant fruit trees 
C)  Freshwater spring 
D)  Abundant berry bushes 
E)  Nightly temperature dropping below freezing

Question 5

Density- dependent factors become less effective as the population size increases.

Accepted Answer

A) True 
 B)False

Question 6

A population grows exponentially when

Accepted Answer

A)  emigration exceeds immigration and the birth rate equals the death rate. 
B)  the birth rate and the death rate are equal. 
C)  the birth rate exceeds the death rate and immigration exceeds emigration. 
D)  the carrying capacity is exceeded. 
E)  the death rate equals the birth rate and immigration is equal to emigration. 
A)  emigration exceeds immigration and the birth rate equals the death rate. 
B)  the birth rate and the death rate are equal. 
C)  the birth rate exceeds the death rate and immigration exceeds emigration. 
D)  the carrying capacity is exceeded. 
E)  the death rate equals the birth rate and immigration is equal to emigration.

Question 7

In a constant- loss population, an organism has an equal risk of dying at any time during its life span.

Accepted Answer

A) True 
 B)False

Question 8

If a caterpillar eats all of the seedlings in your garden, killing all of them, the caterpillar is acting as a

Accepted Answer

A)  saprophyte. 
B)  density- independent factor. 
C)  competitor. 
D)  predator. 
E)  parasite. 
A)  saprophyte. 
B)  density- independent factor. 
C)  competitor. 
D)  predator. 
E)  parasite.

Question 9

According to the equation for population growth rate, if two populations have the same death rates, then the population with r = 2 will increase more rapidly than a population with r = 4.

Accepted Answer

A) True 
 B)False

Question 10

Populations that have been relatively undisturbed by humans normally grow, with no limits set by their environments.

Accepted Answer

A) True 
 B)False

Question 11

A J- curve is typical of a stable population.

Accepted Answer

A) True 
 B)False

Question 12

Parasites often kill their hosts, although they do not directly benefit from their hosts' death. Yet many ecologists believe that parasites may have beneficial effects on their host populations. Why?

Accepted Answer

Parasites tend to destroy weaker and les

Question 13

In areas that have a stable population, the number of children born in a period of time is

Accepted Answer

A)  approximately equal to the number of adults. 
B)  higher than the number of adults. 
C)  lower than the number of adults. 
D)  increasing. 
E)  decreasing. 
A)  approximately equal to the number of adults. 
B)  higher than the number of adults. 
C)  lower than the number of adults. 
D)  increasing. 
E)  decreasing.

Question 14

Natural populations cannot exceed their carrying capacities.

Accepted Answer

A) True 
 B)False

Question 15

A laboratory experiment followed the growth of a flour beetle (Tribolium sp.) population over time. At first, the population increased dramatically, but later the growth slowed and the population size leveled off. Although food (the wheat flour in which they live) was still abundant, the flour beetles resorted to eating their own eggs when population densities got high. What can we conclude about cannibalism in this species?

Accepted Answer

A)  We cannot reach any conclusions based on the information provided. 
B)  It is a density- independent means of population control. 
C)  It has no effect on the growth of the population, as food scarcity is clearly the limiting factor. 
D)  It is clearly maladaptive, as populations always do best when their densities increase as much as possible. 
E)  It is a density- dependent means of population control. 
A)  We cannot reach any conclusions based on the information provided. 
B)  It is a density- independent means of population control. 
C)  It has no effect on the growth of the population, as food scarcity is clearly the limiting factor. 
D)  It is clearly maladaptive, as populations always do best when their densities increase as much as possible. 
E)  It is a density- dependent means of population control.

Question 16

Deforestation increases the productivity of land.

Accepted Answer

A) True 
 B)False

Question 17

All the members of a species that live within an ecosystem form a(n) _ .

Accepted Answer

The answer of All the members of a species that...

Question 18

A complex, interrelated network of organisms and the surrounding nonliving environment in a defined area is a(n)

Accepted Answer

A)  population. 
B)  biome. 
C)  biosphere. 
D)  ecosystem. 
E)  community. 
A)  population. 
B)  biome. 
C)  biosphere. 
D)  ecosystem. 
E)  community.

Question 19

Which of the following correctly describes the effect parasites have on their host's population size and on the host itself?

Accepted Answer

A)  Parasites have a density- dependent effect, but they do not affect host death rates. 
B)  Parasites have a density- dependent effect, and they usually kill their hosts. 
C)  Parasites have a density- independent effect, and they usually kill their hosts. 
D)  Parasites have a density- independent effect, but they do not usually kill their hosts. 
E)  Parasites have a density- dependent effect, but they do not usually kill their hosts. 
A)  Parasites have a density- dependent effect, but they do not affect host death rates. 
B)  Parasites have a density- dependent effect, and they usually kill their hosts. 
C)  Parasites have a density- independent effect, and they usually kill their hosts. 
D)  Parasites have a density- independent effect, but they do not usually kill their hosts. 
E)  Parasites have a density- dependent effect, but they do not usually kill their hosts.

Question 20

Write an equation that describes a situation in which a population remains stable.

Accepted Answer

Birth + immigration = death +

Exam 27: Population Growth and Regulation

The study of how organisms interact with one another and with their nonliving environment is

Parasitism is a density- dependent population control.

-According to the graph, how long does it take the population of deer that is experiencing moderate growth (r = 0.2) to reach 3,000 deer?

A population of birds migrating to winter nesting grounds is blown off course by a late- season hurricane and ends up on an island that is uninhabited by any animal species. Which of the following represents a density- independent factor that will limit the population size?

Density- dependent factors become less effective as the population size increases.

A population grows exponentially when

In a constant- loss population, an organism has an equal risk of dying at any time during its life span.

If a caterpillar eats all of the seedlings in your garden, killing all of them, the caterpillar is acting as a

According to the equation for population growth rate, if two populations have the same death rates, then the population with r = 2 will increase more rapidly than a population with r = 4.

Populations that have been relatively undisturbed by humans normally grow, with no limits set by their environments.

A J- curve is typical of a stable population.

Parasites often kill their hosts, although they do not directly benefit from their hosts' death. Yet many ecologists believe that parasites may have beneficial effects on their host populations. Why?

In areas that have a stable population, the number of children born in a period of time is

Natural populations cannot exceed their carrying capacities.

Deforestation increases the productivity of land.

All the members of a species that live within an ecosystem form a(n) _ .

A complex, interrelated network of organisms and the surrounding nonliving environment in a defined area is a(n)

Which of the following correctly describes the effect parasites have on their host's population size and on the host itself?

Write an equation that describes a situation in which a population remains stable.

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

Cellular Reproduction

Meiosis: the Basis of Sexual Reproduction

Patterns of Inheritance

Dna: the Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amid Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity II: Vertebrates

Animal Behavior

Community Interactions

Energy Flow and Nutrient Cycling in Ecosystems

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

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