Question 1

Although they are not directly toxic to living organisms,chlorofluorocarbons (CFCs)have had unanticipated effects on Earth's atmosphere.The ecological impacts of CFCs will be

Accepted Answer

A)  relatively benign,because even as secondary pollutants their toxicity remains low. 
B)  limited to the terrestrial ecosystem only. 
C)  limited to high-altitude communities where ultraviolet radiation is more intense. 
D)  uniformly serious,affecting almost all ecosystems and trophic levels. 
A)  relatively benign,because even as secondary pollutants their toxicity remains low. 
B)  limited to the terrestrial ecosystem only. 
C)  limited to high-altitude communities where ultraviolet radiation is more intense. 
D)  uniformly serious,affecting almost all ecosystems and trophic levels.

Question 2

All global changes that scientists are now observing on Earth are the result of human activity.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following statements about the worst-case scenario results of climate change is true?

Accepted Answer

A)  They cannot be averted and are inevitable. 
B)  They may be averted only if new technologies are discovered soon enough. 
C)  They can be averted only if the human population decreases by half. 
D)  They can be averted with the use of currently available technologies. 
A)  They cannot be averted and are inevitable. 
B)  They may be averted only if new technologies are discovered soon enough. 
C)  They can be averted only if the human population decreases by half. 
D)  They can be averted with the use of currently available technologies.

Question 4

Ample evidence now demonstrates that human activities are strongly associated with global warming.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following statements about land and water transformations is NOT true?

Accepted Answer

A)  They are caused by humans. 
B)  They are global in scale. 
C)  They are now occurring. 
D)  They have had little effect on the Earth. 
A)  They are caused by humans. 
B)  They are global in scale. 
C)  They are now occurring. 
D)  They have had little effect on the Earth.

Question 6

Increased carbon dioxide levels in the atmosphere cause the pH levels of oceans to ________.

Accepted Answer

The answer of Increased carbon dioxide levels in the atmosphere...

Question 7

Which of the following statements about bioaccumulation and biomagnification is NOT true?

Accepted Answer

A)  They both involve binding of chemicals to cells or tissues. 
B)  They both occur only through ingestion of chemicals. 
C)  They are both caused by humans altering natural nutrient cycles. 
D)  They both result in higher concentrations of a chemical in organisms than in the environment. 
A)  They both involve binding of chemicals to cells or tissues. 
B)  They both occur only through ingestion of chemicals. 
C)  They are both caused by humans altering natural nutrient cycles. 
D)  They both result in higher concentrations of a chemical in organisms than in the environment.

Question 8

Skin cancer is caused by exposure to ultraviolet light.Which of the following chemicals is most likely to be associated with an increase in skin cancer rates?

Accepted Answer

A)  chlorofluorocarbons 
B)  DDT 
C)  fossil fuels 
D)  methylmercury 
A)  chlorofluorocarbons 
B)  DDT 
C)  fossil fuels 
D)  methylmercury

Question 9

An unusual aspect of the recent rise in atmospheric CO2 levels is that

Accepted Answer

A)  scientists have not been able to determine how it is happening. 
B)  CO2 reacts so quickly with other compounds that this increase should not be happening. 
C)  it has happened relatively slowly. 
D)  it has happened relatively rapidly. 
A)  scientists have not been able to determine how it is happening. 
B)  CO2 reacts so quickly with other compounds that this increase should not be happening. 
C)  it has happened relatively slowly. 
D)  it has happened relatively rapidly.

Question 10

The single most significant human-caused contribution to the worldwide increase in atmospheric carbon dioxide levels is

Accepted Answer

A)  acid rain and the subsequent chemical reactions that release carbon dioxide from the soil. 
B)  the use of nitrogen supplements that accelerate decompositional activity and recycle carbon before it can become sequestered in the soil. 
C)  the burning of fossil fuels and the subsequent emission of carbon dioxide. 
D)  deforestation and the subsequent decline in photosynthesis. 
A)  acid rain and the subsequent chemical reactions that release carbon dioxide from the soil. 
B)  the use of nitrogen supplements that accelerate decompositional activity and recycle carbon before it can become sequestered in the soil. 
C)  the burning of fossil fuels and the subsequent emission of carbon dioxide. 
D)  deforestation and the subsequent decline in photosynthesis.

Question 11

The effects of global warming have already been detected in both aquatic and terrestrial ecosystems.

Accepted Answer

A) True 
 B)False

Question 12

Even without the melting of polar ice,global warming is causing sea levels to rise because warm water expands.

Accepted Answer

A) True 
 B)False

Question 13

Compared with past estimates,extinction rates are currently high.What is the most plausible explanation for this increase?

Accepted Answer

A)  Natural fluctuations in climate are causing extinctions. 
B)  Continental drift is causing rapid changes in climate;these changes,in turn,cause extinctions. 
C)  Previous extinctions make survival of contemporary species more difficult. 
D)  Humans are affecting many aspects of the global environment. 
A)  Natural fluctuations in climate are causing extinctions. 
B)  Continental drift is causing rapid changes in climate;these changes,in turn,cause extinctions. 
C)  Previous extinctions make survival of contemporary species more difficult. 
D)  Humans are affecting many aspects of the global environment.

Question 14

Rainfall patterns around the world have changed because of

Accepted Answer

A)  biomagnification. 
B)  ocean acidification. 
C)  global warming. 
D)  land transformation. 
A)  biomagnification. 
B)  ocean acidification. 
C)  global warming. 
D)  land transformation.

Question 15

Wetlands are one of the few habitats to have escaped human-caused destruction;the worldwide distribution of wetlands has remained relatively stable for the past 200 years.

Accepted Answer

A) True 
 B)False

Question 16

The physical and biotic changes humans make to the land surface of Earth are collectively known as land ________.

Accepted Answer

The answer of The physical and biotic changes humans make...

Question 17

The cutting and burning of forests has led to an increase in global ________ levels.

Accepted Answer

The answer of The cutting and burning of forests has...

Question 18

Ample evidence now shows that worldwide environmental changes are occurring.One example of these changes is the

Accepted Answer

A)  increased net primary productivity observed within the world's aquatic ecosystems. 
B)  widespread increase of invasive species. 
C)  moderate decline in atmospheric carbon dioxide concentrations. 
D)  expansion of forested land as tree replanting efforts become more accepted. 
A)  increased net primary productivity observed within the world's aquatic ecosystems. 
B)  widespread increase of invasive species. 
C)  moderate decline in atmospheric carbon dioxide concentrations. 
D)  expansion of forested land as tree replanting efforts become more accepted.

Question 19

Global warming is causing the frequency of storms and severe weather to increase because the rising temperatures also increase ________ energy.

Accepted Answer

The answer of Global warming is causing the frequency of...

Question 20

Carbon dioxide makes up approximately ________ percent of Earth's atmosphere.

Accepted Answer

A)  94 
B)  44 
C)  4 
D)  0.04 
A)  94 
B)  44 
C)  4 
D)  0.04

Exam 25: Global Change

Although they are not directly toxic to living organisms,chlorofluorocarbons (CFCs)have had unanticipated effects on Earth's atmosphere.The ecological impacts of CFCs will be

All global changes that scientists are now observing on Earth are the result of human activity.

Which of the following statements about the worst-case scenario results of climate change is true?

Ample evidence now demonstrates that human activities are strongly associated with global warming.

Which of the following statements about land and water transformations is NOT true?

Increased carbon dioxide levels in the atmosphere cause the pH levels of oceans to ________.

Which of the following statements about bioaccumulation and biomagnification is NOT true?

Skin cancer is caused by exposure to ultraviolet light.Which of the following chemicals is most likely to be associated with an increase in skin cancer rates?

An unusual aspect of the recent rise in atmospheric CO2 levels is that

The single most significant human-caused contribution to the worldwide increase in atmospheric carbon dioxide levels is

The effects of global warming have already been detected in both aquatic and terrestrial ecosystems.

Even without the melting of polar ice,global warming is causing sea levels to rise because warm water expands.

Compared with past estimates,extinction rates are currently high.What is the most plausible explanation for this increase?

Rainfall patterns around the world have changed because of

Wetlands are one of the few habitats to have escaped human-caused destruction;the worldwide distribution of wetlands has remained relatively stable for the past 200 years.

The physical and biotic changes humans make to the land surface of Earth are collectively known as land ________.

The cutting and burning of forests has led to an increase in global ________ levels.

Ample evidence now shows that worldwide environmental changes are occurring.One example of these changes is the

Global warming is causing the frequency of storms and severe weather to increase because the rising temperatures also increase ________ energy.

Carbon dioxide makes up approximately ________ percent of Earth's atmosphere.

The Nature of Science and the Characteristics of Life

The Chemistry of Life

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Cancer and Human Health

Patterns of Inheritance

Chromosomes and Human Genetics

DNA and Genes

From Gene to Protein

DNA Technology

How Evolution Works

The Origin of Species

The Evolution of Biodiversity

Biological Diversity, Bacteria, and Archaea

Protista, Plantae, and Fungi

Animalia

The Biosphere

Growth of Populations

Animal Behavior

Ecological Communities

Ecosystems

Internal Organization and Homeostasis

Nutrition and Digestion

Circulation and Gas Exchange

Animal Hormones

Nervous and Sensory Systems

Skeletons,Muscles,and Movement

The Immune System

Reproduction and Development

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

Filters

An unusual aspect of the recent rise in atmospheric CO₂ levels is that