Question 1

A population's demographics include its

Accepted Answer

A)  size. 
B)  age. 
C)  structure. 
D)  density. 
E)  all of these. 
A)  size. 
B)  age. 
C)  structure. 
D)  density. 
E)  all of these.

Question 2

Chlorofluorocarbons (CFCs) are pollutants because

Accepted Answer

A)  biogeochemical mechanisms for their removal have not yet appeared in the biosphere. 
B)  they combine with water to form hydrochloric and hydrofluoric acids. 
C)  they are found in smog. 
D)  they are photochemical oxidants. 
E)  they combine with carbon dioxide to form acid rain. 
A)  biogeochemical mechanisms for their removal have not yet appeared in the biosphere. 
B)  they combine with water to form hydrochloric and hydrofluoric acids. 
C)  they are found in smog. 
D)  they are photochemical oxidants. 
E)  they combine with carbon dioxide to form acid rain.

Question 3

In natural communities, some feedback mechanisms operate whenever populations change in size; they are

Accepted Answer

A)  density-dependent factors. 
B)  density-independent factors. 
C)  always within the individuals of the community. 
D)  always outside the individuals of the community. 
E)  the same as genetic drift. 
A)  density-dependent factors. 
B)  density-independent factors. 
C)  always within the individuals of the community. 
D)  always outside the individuals of the community. 
E)  the same as genetic drift.

Question 4

Selecting the Exception Four of the five answers listed below are the result of agriculture and power generation. Select the exception.

Accepted Answer

A)  pesticide runoff 
B)  increase in atmospheric cooling 
C)  increase in atmospheric heating 
D)  fertilizer runoff 
E)  radioactive wastes 
A)  pesticide runoff 
B)  increase in atmospheric cooling 
C)  increase in atmospheric heating 
D)  fertilizer runoff 
E)  radioactive wastes

Question 5

The total number of individuals in a given area of habitat is the

Accepted Answer

A)  population density. 
B)  population growth. 
C)  population birth rate. 
D)  population size. 
E)  carrying capacity. 
A)  population density. 
B)  population growth. 
C)  population birth rate. 
D)  population size. 
E)  carrying capacity.

Question 6

Which statement about nuclear power plants is true?

Accepted Answer

A)  The cost of their net energy production is relatively low. 
B)  Their waste products lead to the production of acid rain. 
C)  Their waste products are not radioactive. 
D)  People generally feel secure about the safety of nuclear power plants. 
E)  Their construction is increasing. 
A)  The cost of their net energy production is relatively low. 
B)  Their waste products lead to the production of acid rain. 
C)  Their waste products are not radioactive. 
D)  People generally feel secure about the safety of nuclear power plants. 
E)  Their construction is increasing.

Question 7

A change in a population that is NOT related strictly to the size of the population is best described as

Accepted Answer

A)  density-dependent. 
B)  density-independent. 
C)  within. 
D)  an S-shaped curve. 
E)  a J-shaped curve. 
A)  density-dependent. 
B)  density-independent. 
C)  within. 
D)  an S-shaped curve. 
E)  a J-shaped curve.

Question 8

Populations

Accepted Answer

A)  are limited by only one factor at a time. 
B)  increase arithmetically. 
C)  increase indefinitely. 
D)  are limited by the carrying capacity. 
E)  are represented by a minimum of two different sizes. 
A)  are limited by only one factor at a time. 
B)  increase arithmetically. 
C)  increase indefinitely. 
D)  are limited by the carrying capacity. 
E)  are represented by a minimum of two different sizes.

Question 9

Biological magnification refers to the

Accepted Answer

A)  increase in size of animals as they progress through a food chain. 
B)  increase in size of organisms as they progress through ecological succession. 
C)  increase in the efficiency of energy utilization as organisms progress through a food chain. 
D)  accumulation of toxic pollutants as animals pass through a food chain. 
E)  growth of organ size within organisms. 
A)  increase in size of animals as they progress through a food chain. 
B)  increase in size of organisms as they progress through ecological succession. 
C)  increase in the efficiency of energy utilization as organisms progress through a food chain. 
D)  accumulation of toxic pollutants as animals pass through a food chain. 
E)  growth of organ size within organisms.

Question 10

Deforestation results in

Accepted Answer

A)  increased air temperatures. 
B)  decreased soil fertility. 
C)  decreased transpiration rates of individual plants. 
D)  increased air temperatures and decreased soil fertility. 
E)  increased air temperatures, decreased soil fertility, and decreased transpiration rates of individual plants. 
A)  increased air temperatures. 
B)  decreased soil fertility. 
C)  decreased transpiration rates of individual plants. 
D)  increased air temperatures and decreased soil fertility. 
E)  increased air temperatures, decreased soil fertility, and decreased transpiration rates of individual plants.

Question 11

Atmospheric carbon dioxide levels

Accepted Answer

A)  drop in the winter. 
B)  drop in the spring. 
C)  drop in the summer. 
D)  drop in the fall. 
E)  always remain constant. 
A)  drop in the winter. 
B)  drop in the spring. 
C)  drop in the summer. 
D)  drop in the fall. 
E)  always remain constant.

Question 12

A problem that is expected to develop with the occurrence of overpopulation is the ability to

Accepted Answer

A)  grow enough food. 
B)  find enough drinking water. 
C)  find enough energy sources. 
D)  find enough raw materials to meet the population's needs. 
E)  all of these. 
A)  grow enough food. 
B)  find enough drinking water. 
C)  find enough energy sources. 
D)  find enough raw materials to meet the population's needs. 
E)  all of these.

Question 13

What percentage of the world's tropical forests have been cut down for cropland, fuel wood, grazing land and timber?

Accepted Answer

A)  20% 
B)  30% 
C)  40% 
D)  50% 
E)  60% 
A)  20% 
B)  30% 
C)  40% 
D)  50% 
E)  60%

Question 14

Selecting the Exception Four of the five answers listed below are human efforts to improve the carrying capacity of the earth for humans. Select the exception.

Accepted Answer

A)  desertification 
B)  recycling 
C)  green revolution 
D)  irrigation 
E)  conservation 
A)  desertification 
B)  recycling 
C)  green revolution 
D)  irrigation 
E)  conservation

Question 15

Landfills generally contain

Accepted Answer

A)  all garbage. 
B)  nonbiodegradable wastes. 
C)  nonrecycled solid wastes. 
D)  biohazardous wastes. 
E)  all of these. 
A)  all garbage. 
B)  nonbiodegradable wastes. 
C)  nonrecycled solid wastes. 
D)  biohazardous wastes. 
E)  all of these.

Question 16

The temperature of the lower atmosphere has risen the most

Accepted Answer

A)  in the last 150 years. 
B)  in the last 60 years. 
C)  in the last 250 years. 
D)  in the last 100 years. 
E)  in the last 1000 years. 
A)  in the last 150 years. 
B)  in the last 60 years. 
C)  in the last 250 years. 
D)  in the last 100 years. 
E)  in the last 1000 years.

Question 17

Fresh water and forests may be tapped indefinitely as long as they're replenished. They are classified as

Accepted Answer

A)  nonrenewable resources. 
B)  renewable resources. 
C)  ecological sources. 
D)  biogeographical resources. 
E)  point sources. 
A)  nonrenewable resources. 
B)  renewable resources. 
C)  ecological sources. 
D)  biogeographical resources. 
E)  point sources.

Question 18

The release of DDT into the environment to control some insect pests will result in the highest detectable concentrations

Accepted Answer

A)  at the bottom of the food chain. 
B)  in the targeted insect pest. 
C)  in the middle of the food chain. 
D)  at the end of the food chain. 
E)  nowhere, because DDT is degraded rapidly. 
A)  at the bottom of the food chain. 
B)  in the targeted insect pest. 
C)  in the middle of the food chain. 
D)  at the end of the food chain. 
E)  nowhere, because DDT is degraded rapidly.

Question 19

In biological magnification,

Accepted Answer

A)  poisons build up in food chains and webs so that the concentration is highest at the high end of the food chain. 
B)  there is a tendency for an environment to change when organisms first invade. 
C)  more highly evolved forms are able to build large populations under favorable conditions. 
D)  parasites spread rapidly through congested populations. 
E)  sediments fill in aquatic environments so that succession will occur if organisms disturb the aquatic habitat. 
A)  poisons build up in food chains and webs so that the concentration is highest at the high end of the food chain. 
B)  there is a tendency for an environment to change when organisms first invade. 
C)  more highly evolved forms are able to build large populations under favorable conditions. 
D)  parasites spread rapidly through congested populations. 
E)  sediments fill in aquatic environments so that succession will occur if organisms disturb the aquatic habitat.

Question 20

Industrial smog would be the result of which of the following?

Accepted Answer

A)  burning fossil fuels 
B)  particulates in the air 
C)  a thermal inversion 
D)  industrial smokestacks 
E)  all of these 
A)  burning fossil fuels 
B)  particulates in the air 
C)  a thermal inversion 
D)  industrial smokestacks 
E)  all of these

Exam 25: Human Impacts on the Biosphere

A population's demographics include its

Chlorofluorocarbons (CFCs) are pollutants because

In natural communities, some feedback mechanisms operate whenever populations change in size; they are

Selecting the Exception Four of the five answers listed below are the result of agriculture and power generation. Select the exception.

The total number of individuals in a given area of habitat is the

Which statement about nuclear power plants is true?

A change in a population that is NOT related strictly to the size of the population is best described as

Populations

Biological magnification refers to the

Deforestation results in

Atmospheric carbon dioxide levels

A problem that is expected to develop with the occurrence of overpopulation is the ability to

What percentage of the world's tropical forests have been cut down for cropland, fuel wood, grazing land and timber?

Selecting the Exception Four of the five answers listed below are human efforts to improve the carrying capacity of the earth for humans. Select the exception.

Landfills generally contain

The temperature of the lower atmosphere has risen the most

Fresh water and forests may be tapped indefinitely as long as they're replenished. They are classified as

The release of DDT into the environment to control some insect pests will result in the highest detectable concentrations

In biological magnification,

Industrial smog would be the result of which of the following?

Learning About Human Biology

Chemistry of Life

Cells and How They Work

Tissues, Organs, and Organ Systems

The Skeletal System

The Muscular System

Circulation: the Heart and Blood Vessels

Blood

Immunity and Disease

The Respiratory System

Digestion and Nutrition

The Urinary System

The Nervous System

Sensory Systems

The Endocrine System

Reproductive Systems

Development and Aging

Cell Reproduction

Introduction to Genetics

Chromosomes and Human Genetics

DNA, Genes, and Biotechnology

Genes and Disease: Cancer

Principles of Evolution

Principles of Ecology

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