Question 1

Floods and fires are examples of_________ , which can dramatically and unpredictably reduce populations.

Accepted Answer

A)  environmental resistance 
B)  density-dependent factors 
C)  demographic factors 
D)  biotic factors 
E)  logistic growth factors 
A)  environmental resistance 
B)  density-dependent factors 
C)  demographic factors 
D)  biotic factors 
E)  logistic growth factors

Question 2

Many species of field mice are able to reproduce several times a year and produce litters with multiple offspring. However, an ecologist noted that the population size of mice, as measured in a California grassland, did not change from year to year. The factors that keep natural populations from increasing are collectively called

Accepted Answer

A)  nonliving factors. 
B)  exponential growth. 
C)  scramble competition. 
D)  biotic potential. 
E)  environmental resistance. 
A)  nonliving factors. 
B)  exponential growth. 
C)  scramble competition. 
D)  biotic potential. 
E)  environmental resistance.

Question 3

At the start of a study, 200 spotted owls lived in an old-growth forest patch in western Oregon. During the next year, a biologist tracking the birds observed that 25 new birds hatched and 5 died. What was the growth rate (r) for this year?

Accepted Answer

A)  20 
B)  200 
C)  5 
D)  25 
E)  0.1 
A)  20 
B)  200 
C)  5 
D)  25 
E)  0.1

Question 4

Zebra mussels were introduced into Lake St. Clair around 1988. The table lists the population densities (in grams dry weight per square meter of lake bottom) of native unionid mussels and exotic zebra mussels in the lake before and after this introduction. Both groups feed by filtering small particles from the water. Based on the information given, which of the following best describes the likely relationship between zebra mussels and unionids?

Accepted Answer

A)  Zebra mussels exert a density-dependent control on unionid populations. 
B)  Zebra mussels and unionids have no effect on each other. 
C)  Unionids exert a density-independent control on zebra mussel populations. 
D)  Unionids exert a density-dependent control on zebra mussel populations. 
E)  Zebra mussels exert a density-independent control on unionid populations. 
A)  Zebra mussels exert a density-dependent control on unionid populations. 
B)  Zebra mussels and unionids have no effect on each other. 
C)  Unionids exert a density-independent control on zebra mussel populations. 
D)  Unionids exert a density-dependent control on zebra mussel populations. 
E)  Zebra mussels exert a density-independent control on unionid populations.

Question 5

How does the environment limit population growth?

Accepted Answer

Competition, predation, limits

Question 6

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

Accepted Answer

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

Question 7

Exponential growth occurs

Accepted Answer

A)  only in theory, never in actual populations. 
B)  frequently in natural populations. 
C)  at regular intervals in natural populations. 
D)  only for a limited time in natural populations. 
E)  only in laboratory populations. 
A)  only in theory, never in actual populations. 
B)  frequently in natural populations. 
C)  at regular intervals in natural populations. 
D)  only for a limited time in natural populations. 
E)  only in laboratory populations.

Question 8

Within their territory, pack animals such as wolves exhibit a uniform distribution.

Accepted Answer

A) True 
 B)False

Question 9

Schools of fish typically exhibit a _________distribution pattern.

Accepted Answer

A)  J-curve 
B)  scrambled 
C)  uniform 
D)  clumped 
E)  random 
A)  J-curve 
B)  scrambled 
C)  uniform 
D)  clumped 
E)  random

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

The different species within an ecosystem that interact in various ways make up a(n)

Accepted Answer

A)  ecotone. 
B)  aggregation. 
C)  community. 
D)  trophic level. 
E)  population. 
A)  ecotone. 
B)  aggregation. 
C)  community. 
D)  trophic level. 
E)  population.

Question 12

At present, Earthʹs human population is

Accepted Answer

A)  declining. 
B)  increasing by about 10% per year. 
C)  increasing at a constant rate. 
D)  stable. 
E)  increasing exponentially. 
A)  declining. 
B)  increasing by about 10% per year. 
C)  increasing at a constant rate. 
D)  stable. 
E)  increasing exponentially.

Question 13

Humans are classified as a late-loss population.

Accepted Answer

A) True 
 B)False

Question 14

If the individuals of a species are likely to live until old age, that species exhibits a(n)_________ survivorship curve.

Accepted Answer

A)  S-shaped 
B)  early-loss 
C)  constant-loss 
D)  late-loss 
E)  declining 
A)  S-shaped 
B)  early-loss 
C)  constant-loss 
D)  late-loss 
E)  declining

Question 15

In the eighteenth and nineteenth centuries, people increased Earth?s capacity to support more humans through_________ advances.

Accepted Answer

A)  psychological 
B)  social-medical 
C)  cultural 
D)  demographic 
E)  industrial-agricultural 
A)  psychological 
B)  social-medical 
C)  cultural 
D)  demographic 
E)  industrial-agricultural

Question 16

Why has it been so hard to come up with an accurate measure of Earthʹs carrying capacity for humans?

Accepted Answer

Humans have the ability to inc

Question 17

Parasitism is a density-dependent population control.

Accepted Answer

A) True 
 B)False

Question 18

Human populations have continued to grow because humans have increased Earth?s_________through agriculture, medicine, and technology.

Accepted Answer

The answer of Human populations have continued to grow because...

Question 19

When resources are limited but spread evenly throughout a region, plants are likely to form a uniform distribution pattern.

Accepted Answer

A) True 
 B)False

Question 20

In a deciduous oak forest in the northeastern United States, one example of a nonliving component of the ecosystem is

Accepted Answer

A)  nematodes in the soil that feed on dead organic matter. 
B)  nematodes in the soil that feed on plant roots. 
C)  the smaller plants living under the oak trees. 
D)  sunlight that filters through the canopy. 
E)  animals such as deer that migrate through the forest but do not eat in the forest. 
A)  nematodes in the soil that feed on dead organic matter. 
B)  nematodes in the soil that feed on plant roots. 
C)  the smaller plants living under the oak trees. 
D)  sunlight that filters through the canopy. 
E)  animals such as deer that migrate through the forest but do not eat in the forest.

Exam 27: Population Growth and Regulation

Floods and fires are examples of_________ , which can dramatically and unpredictably reduce populations.

At the start of a study, 200 spotted owls lived in an old-growth forest patch in western Oregon. During the next year, a biologist tracking the birds observed that 25 new birds hatched and 5 died. What was the growth rate (r) for this year?

How does the environment limit population growth?

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

Exponential growth occurs

Within their territory, pack animals such as wolves exhibit a uniform distribution.

Schools of fish typically exhibit a _________distribution pattern.

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

The different species within an ecosystem that interact in various ways make up a(n)

At present, Earthʹs human population is

Humans are classified as a late-loss population.

If the individuals of a species are likely to live until old age, that species exhibits a(n)_________ survivorship curve.

In the eighteenth and nineteenth centuries, people increased Earth?s capacity to support more humans through_________ advances.

Why has it been so hard to come up with an accurate measure of Earthʹs carrying capacity for humans?

Parasitism is a density-dependent population control.

Human populations have continued to grow because humans have increased Earth?s_________through agriculture, medicine, and technology.

When resources are limited but spread evenly throughout a region, plants are likely to form a uniform distribution pattern.

In a deciduous oak forest in the northeastern United States, one example of a nonliving component of the ecosystem is

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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