Question 1

Which of the following statements best describes the relationship between deforestation and changes in atmospheric carbon dioxide levels?

Accepted Answer

A)  In the absence of forests, herbivore populations decline; without their respiration, less carbon dioxide is recycled into the atmosphere. 
B)  The carbon dioxide used by forest plants for cellular respiration would all be released into the atmosphere at once. 
C)  Trees naturally die and decompose, but when they are turned into lumber their carbon is prevented from recycling back to the atmosphere. 
D)  In the absence of forest plants, less carbon dioxide is removed from the atmosphere for use during photosynthesis. 
A)  In the absence of forests, herbivore populations decline; without their respiration, less carbon dioxide is recycled into the atmosphere. 
B)  The carbon dioxide used by forest plants for cellular respiration would all be released into the atmosphere at once. 
C)  Trees naturally die and decompose, but when they are turned into lumber their carbon is prevented from recycling back to the atmosphere. 
D)  In the absence of forest plants, less carbon dioxide is removed from the atmosphere for use during photosynthesis.

Question 2

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 3

The atmospheric concentration of carbon dioxide is now approaching levels equal to those estimated to have existed 420,000 years ago.

Accepted Answer

A) True 
 B)False

Question 4

The best hope for slowing Earth's rapid ecological changes is to decrease the ________ impact on the biosphere to a sustainable level.

Accepted Answer

The answer of The best hope for slowing Earth's rapid...

Question 5

Which of the following statements about carbon dioxide levels in Earth's atmosphere is true?

Accepted Answer

A)  They peaked around 1950 and have been slowly decreasing since then. 
B)  They are high now but are not higher than the highest estimated levels during the last 420,000 years. 
C)  They are estimated to be higher now than at any time in the past 420,000 years. 
D)  They began to decrease when the use of CFCs stopped. 
A)  They peaked around 1950 and have been slowly decreasing since then. 
B)  They are high now but are not higher than the highest estimated levels during the last 420,000 years. 
C)  They are estimated to be higher now than at any time in the past 420,000 years. 
D)  They began to decrease when the use of CFCs stopped.

Question 6

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 7

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 8

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 9

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

Question 10

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 11

Atmospheric carbon dioxide levels are increasing because

Accepted Answer

A)  human agriculture has greatly increased the amount of carbon dioxide given off by plants during respiration. 
B)  human activities have begun to release carbon that was formerly sequestered in fossil fuels into the atmosphere. 
C)  holes in the ozone layer have reduced the total amount of photosynthesis occurring in the biosphere. 
D)  the huge growth of the human population and the domestic livestock population has increased the amount of carbon dioxide being released through respiration. 
A)  human agriculture has greatly increased the amount of carbon dioxide given off by plants during respiration. 
B)  human activities have begun to release carbon that was formerly sequestered in fossil fuels into the atmosphere. 
C)  holes in the ozone layer have reduced the total amount of photosynthesis occurring in the biosphere. 
D)  the huge growth of the human population and the domestic livestock population has increased the amount of carbon dioxide being released through respiration.

Question 12

The release of chlorofluorocarbons (CFCs)into the atmosphere has caused a(n)

Accepted Answer

A)  increase in the amount of usable nitrogen. 
B)  decrease in the amount of ultraviolet light reaching Earth. 
C)  increase in acid rainfall. 
D)  decrease in Earth's ozone layer. 
A)  increase in the amount of usable nitrogen. 
B)  decrease in the amount of ultraviolet light reaching Earth. 
C)  increase in acid rainfall. 
D)  decrease in Earth's ozone layer.

Question 13

An increase in POP concentrations in higher trophic levels is the result of

Accepted Answer

A)  biomagnification. 
B)  bioaccumulation. 
C)  bioacidification. 
D)  biodegradation. 
A)  biomagnification. 
B)  bioaccumulation. 
C)  bioacidification. 
D)  biodegradation.

Question 14

If all bacteria were suddenly unable to absorb mercury,biomagnification of methylmercury would most likely

Accepted Answer

A)  stop. 
B)  continue. 
C)  continue, but only in the lower trophic levels. 
D)  continue, but only in the higher trophic levels. 
A)  stop. 
B)  continue. 
C)  continue, but only in the lower trophic levels. 
D)  continue, but only in the higher trophic levels.

Question 15

Increased agricultural productivity in the northern latitudes is expected to be a consequence of global warming because

Accepted Answer

A)  the increased temperatures will lead to a longer growing season. 
B)  cold-tolerant plants will adapt to become hardier. 
C)  soil acidification will occur in those areas. 
D)  agricultural productivity increases are predicted for all latitudes. 
A)  the increased temperatures will lead to a longer growing season. 
B)  cold-tolerant plants will adapt to become hardier. 
C)  soil acidification will occur in those areas. 
D)  agricultural productivity increases are predicted for all latitudes.

Question 16

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 17

Changes to Earth's physical and biotic features are called land and water transformations.Which of the following human activities is an example of a water transformation?

Accepted Answer

A)  clearing land along an urban growth boundary to enable a city to expand 
B)  constructing a dam along a river so that an expanding city may increase the availability of drinking water 
C)  clear-cutting a forest for the lumber needed to build houses for an expanding city 
D)  clear-cutting a forest to make cropland to grow food for an expanding city 
A)  clearing land along an urban growth boundary to enable a city to expand 
B)  constructing a dam along a river so that an expanding city may increase the availability of drinking water 
C)  clear-cutting a forest for the lumber needed to build houses for an expanding city 
D)  clear-cutting a forest to make cropland to grow food for an expanding city

Question 18

Scientists predict that current increases in atmospheric carbon dioxide concentrations will cause temperatures on Earth to rise,a phenomenon known as ________.

Accepted Answer

The answer of Scientists predict that current increases in atmospheric...

Question 19

Some chemicals and heavy metals bioaccumulate readily because they are

Accepted Answer

A)  rare in the environments, so organisms collect them efficiently. 
B)  very concentrated in the abiotic environment. 
C)  stored in the body because they have nutritional value. 
D)  collected in the body more rapidly than they are removed. 
A)  rare in the environments, so organisms collect them efficiently. 
B)  very concentrated in the abiotic environment. 
C)  stored in the body because they have nutritional value. 
D)  collected in the body more rapidly than they are removed.

Question 20

Pikas,shown in the photograph,are adapted to mountainous environments.How are species such as pikas changing their habitats in response to global warming?

Accepted Answer

A)  They are moving northward toward the Arctic. 
B)  They are moving their ranges up the mountains to cooler habitats. 
C)  They are inhabiting areas that are closer to cool mountain lakes. 
D)  They are inhabiting areas that are adjacent to mountain glaciers. 
A)  They are moving northward toward the Arctic. 
B)  They are moving their ranges up the mountains to cooler habitats. 
C)  They are inhabiting areas that are closer to cool mountain lakes. 
D)  They are inhabiting areas that are adjacent to mountain glaciers.

Exam 25: Global Change

Which of the following statements best describes the relationship between deforestation and changes in atmospheric carbon dioxide levels?

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

The atmospheric concentration of carbon dioxide is now approaching levels equal to those estimated to have existed 420,000 years ago.

The best hope for slowing Earth's rapid ecological changes is to decrease the ________ impact on the biosphere to a sustainable level.

Which of the following statements about carbon dioxide levels in Earth's atmosphere is 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?

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

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

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

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

Atmospheric carbon dioxide levels are increasing because

The release of chlorofluorocarbons (CFCs)into the atmosphere has caused a(n)

An increase in POP concentrations in higher trophic levels is the result of

If all bacteria were suddenly unable to absorb mercury,biomagnification of methylmercury would most likely

Increased agricultural productivity in the northern latitudes is expected to be a consequence of global warming because

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

Changes to Earth's physical and biotic features are called land and water transformations.Which of the following human activities is an example of a water transformation?

Scientists predict that current increases in atmospheric carbon dioxide concentrations will cause temperatures on Earth to rise,a phenomenon known as ________.

Some chemicals and heavy metals bioaccumulate readily because they are

Pikas,shown in the photograph,are adapted to mountainous environments.How are species such as pikas changing their habitats in response to global warming?

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

Photo Synthesis 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

Filters