Question 1

Ozone gas in the lower part of the stratosphere filters out how much of the sun's harmful ultraviolet (UV)radiation?

Accepted Answer

A)  10% 
B)  20% 
C)  33% 
D)  67% 
E)  95% 
A)  10% 
B)  20% 
C)  33% 
D)  67% 
E)  95%

Question 2

The hydrologic cycle is a way nature renews water quality.

Accepted Answer

A) True 
 B)False

Question 3

While the troposphere is 11 miles thick above sea level at the tropics,it is only four miles thick above the North and South poles.

Accepted Answer

A) True 
 B)False

Question 4

What term describes groups of different species living together in a particular place with a potential for interacting with one another?

Accepted Answer

A)  organism 
B)  population 
C)  community 
D)  ecosystem 
E)  biosphere 
A)  organism 
B)  population 
C)  community 
D)  ecosystem 
E)  biosphere

Question 5

Scientists estimate that tropical rain forests contain up to half of the earth's land plants and animal species.What percentage of the world's land surface do tropical rain forests cover?

Accepted Answer

A)  2 
B)  4 
C)  8 
D)  10 
E)  12 
A)  2 
B)  4 
C)  8 
D)  10 
E)  12

Question 6

The hydrosphere is the earth's intensely hot core,thick mantle composed mostly of rock,and thin outer crust.

Accepted Answer

A) True 
 B)False

Question 7

Most precipitation falling on terrestrial ecosystems becomes ____.

Accepted Answer

A)  surface runoff into lakes,streams,and the ocean 
B)  ice in glaciers 
C)  groundwater in aquifers 
D)  storage as part of rocks 
E)  storage in living components of ecosystems 
A)  surface runoff into lakes,streams,and the ocean 
B)  ice in glaciers 
C)  groundwater in aquifers 
D)  storage as part of rocks 
E)  storage in living components of ecosystems

Question 8

Because carbon makes up such a small amount of the earth's atmosphere,even a small change,caused by nature or by humans,affects the earth's climate.

Accepted Answer

A) True 
 B)False

Question 9

Methane,CO2,and water vapor make up about 30% of the earth's troposphere.

Accepted Answer

A) True 
 B)False

Question 10

The disappearance of the tropical rain forests is an important issue because it will ____.

Accepted Answer

A)  increase financial stability in the affected countries 
B)  accelerate atmospheric warming 
C)  stabilize regional weather patterns 
D)  result in more places to build cities 
E)  reduce the spread of new infectious diseases to humans 
A)  increase financial stability in the affected countries 
B)  accelerate atmospheric warming 
C)  stabilize regional weather patterns 
D)  result in more places to build cities 
E)  reduce the spread of new infectious diseases to humans

Question 11

Ecology is the study of ____.

Accepted Answer

A)  how human impacts the environment 
B)  the abiotic elements of the environment 
C)  the biotic elements of the environment 
D)  how organisms interact with each other and the nonliving environment 
E)  how evolution formed populations 
A)  how human impacts the environment 
B)  the abiotic elements of the environment 
C)  the biotic elements of the environment 
D)  how organisms interact with each other and the nonliving environment 
E)  how evolution formed populations

Question 12

In the plains states of the U.S.(Kansas,Nebraska,Texas,etc. ),agricultural withdrawal of groundwater from aquifers has greatly exceeded the supply.Explain why removal of this resource will have long-term effects on the hydrologic cycle.

Accepted Answer

Aquifers,such as the Oglalla Aquifer in

Question 13

-In the accompanying figure,notice that the fox (secondary consumer)is in the process of pouncing on the rabbit.If humans were to remove that predator (fox),what would be the effects on the rest of the ecosystem? Be as specific as possible.

Accepted Answer

The loss of a predator in an ecosystem r

Question 14

Ecologists assign every type of organism in an ecosystem to a feeding level or ____________________.

Accepted Answer

The answer of Ecologists assign every type of organism in...

Question 15

Much of the earth's sulfur is stored in

Accepted Answer

A)  plants and animals 
B)  the oceans 
C)  the atmosphere 
D)  underground rocks and minerals 
E)  soil 
A)  plants and animals 
B)  the oceans 
C)  the atmosphere 
D)  underground rocks and minerals 
E)  soil

Question 16

The reason we observe a "pyramid" of energy flow instead of an energy flow "cube" is because the low ecological efficiency of biological systems limits the numbers of organism in the higher trophic levels.

Accepted Answer

A) True 
 B)False

Question 17

Ammonia that is not taken up by plants may undergo ____.

Accepted Answer

A)  denitrification 
B)  nitrogen fixation 
C)  nitrification 
D)  acid deposition 
E)  phosphorization 
A)  denitrification 
B)  nitrogen fixation 
C)  nitrification 
D)  acid deposition 
E)  phosphorization

Question 18

Which terrestrial ecosystem or life zone produces the highest net primary productivity per year?

Accepted Answer

A)  temperate forest 
B)  Savanna 
C)  tundra 
D)  swamps and marshes 
E)  extreme desert 
A)  temperate forest 
B)  Savanna 
C)  tundra 
D)  swamps and marshes 
E)  extreme desert

Question 19

Humans add sulfur to the atmosphere primarily by the release of ____.

Accepted Answer

A)  sulfate 
B)  DMS 
C)  hydrogen sulfide 
D)  sulfur trioxide 
E)  sulfur dioxide 
A)  sulfate 
B)  DMS 
C)  hydrogen sulfide 
D)  sulfur trioxide 
E)  sulfur dioxide

Question 20

What is an end product of anaerobic respiration?

Accepted Answer

A)  acetic acid 
B)  glucose 
C)  oxygen 
D)  carbon dioxide 
E)  water 
A)  acetic acid 
B)  glucose 
C)  oxygen 
D)  carbon dioxide 
E)  water

Exam 3: Ecosystems: What Are They and How Do They Work

Ozone gas in the lower part of the stratosphere filters out how much of the sun's harmful ultraviolet (UV)radiation?

The hydrologic cycle is a way nature renews water quality.

While the troposphere is 11 miles thick above sea level at the tropics,it is only four miles thick above the North and South poles.

What term describes groups of different species living together in a particular place with a potential for interacting with one another?

Scientists estimate that tropical rain forests contain up to half of the earth's land plants and animal species.What percentage of the world's land surface do tropical rain forests cover?

The hydrosphere is the earth's intensely hot core,thick mantle composed mostly of rock,and thin outer crust.

Most precipitation falling on terrestrial ecosystems becomes ____.

Because carbon makes up such a small amount of the earth's atmosphere,even a small change,caused by nature or by humans,affects the earth's climate.

Methane,CO2,and water vapor make up about 30% of the earth's troposphere.

The disappearance of the tropical rain forests is an important issue because it will ____.

Ecology is the study of ____.

In the plains states of the U.S.(Kansas,Nebraska,Texas,etc. ),agricultural withdrawal of groundwater from aquifers has greatly exceeded the supply.Explain why removal of this resource will have long-term effects on the hydrologic cycle.

-In the accompanying figure,notice that the fox (secondary consumer)is in the process of pouncing on the rabbit.If humans were to remove that predator (fox),what would be the effects on the rest of the ecosystem? Be as specific as possible.

Ecologists assign every type of organism in an ecosystem to a feeding level or ____________________.

Much of the earth's sulfur is stored in

The reason we observe a "pyramid" of energy flow instead of an energy flow "cube" is because the low ecological efficiency of biological systems limits the numbers of organism in the higher trophic levels.

Ammonia that is not taken up by plants may undergo ____.

Which terrestrial ecosystem or life zone produces the highest net primary productivity per year?

Humans add sulfur to the atmosphere primarily by the release of ____.

What is an end product of anaerobic respiration?

Environmental Problems, their Causes, and Sustainability

Science, matter, energy, and Systems

Biodiversity and Evolution

Biodiversity, species Interactions, and Population Control

The Human Population and Its Impact

Climate and Biodiversity

Aquatic Biodiversity

Sustaining Biodiversity: The Species Approach

Sustaining Terrestrial Biodiversity: The Ecosystem Approach

Sustaining Aquatic Biodiversity

Food, soil, and Pest Management

Water Resources

Geology and Nonrenewable Mineral Resources

Nonrenewable Energy

Energy Efficiency and Renewable Energy

Environmental Hazards and Human Health

Air Pollution

Climate Disruption and Ozone Depletion

Water Pollution

Solid and Hazardous Waste

Cities and Sustainability

Economics, environment, and Sustainability

Politics, environment, and Sustainability

Environmental Worldviews, ethics, and Sustainability

Filters

Methane,CO₂,and water vapor make up about 30% of the earth's troposphere.