Question 1

Nitrogen fixation is accomplished by specialized ____________________ in the soil and ____________________ in aquatic environments.

Accepted Answer

bacteria; blue green algae
bacteria; cyanobacteria

Question 2

All microbes are pathogenic (disease causing) or otherwise dangerous.

Accepted Answer

A) True 
 B)False  False

Question 3

Organisms that feed only on plants are called

Accepted Answer

A) detritivores 
B) omnivores 
C) carnivores 
D) herbivores 
E) decomposers 
A) detritivores 
B) omnivores 
C) carnivores 
D) herbivores 
E) decomposers D

Question 4

The rotten-egg smell coming from volcanoes and anaerobic decomposition in bogs and swamps comes from the gas ____________________.

Accepted Answer

hydrogen s

Question 5

Sophisticated satellite imaging programs from __________ now allow scientists and non-scientists to be connected to even the most remote ecosystems.

Accepted Answer

A) National Oceanic and Atmospheric Agency 
B) National Aeronautic and Space Administration 
C) U.S.Military 
D) Google Earth 
E) European Space Agency 
A) National Oceanic and Atmospheric Agency 
B) National Aeronautic and Space Administration 
C) U.S.Military 
D) Google Earth 
E) European Space Agency

Question 6

Ecologists would make use of which of the following in their study of nature?

Accepted Answer

A) field research 
B) geographic information system software 
C) controlled experiments 
D) remote sensing devices 
E) all of these 
A) field research 
B) geographic information system software 
C) controlled experiments 
D) remote sensing devices 
E) all of these

Question 7

Carbon cycles through the biosphere and depends on the process of ____________________ and ____________________.

Accepted Answer

photosynthesis; resp

Question 8

The hydrologic cycle is driven primarily by

Accepted Answer

A) solar energy 
B) lunar tides 
C) solar tides 
D) mechanical energy 
E) chemical energy 
A) solar energy 
B) lunar tides 
C) solar tides 
D) mechanical energy 
E) chemical energy

Question 9

The rate at which an ecosystem's producers convert solar energy into chemical energy as biomass is called ____________________.

Accepted Answer

gross prim

Question 10

The "greenhouse effect" is a strictly artificial (human-made) phenomenon.

Accepted Answer

A) True 
 B)False

Question 11

The hydrologic cycle is a way nature renews water quality.

Accepted Answer

A) True 
 B)False

Question 12

If grass stores 1,000 energy units received from the sun, the ecological efficiency of the ecosystem is 10%, and the trophic levels are grass  cow  human, how many units of energy does the human receive of the original 1,000 units?

Accepted Answer

A) 900 
B) 200 
C) 100 
D) 10 
E) 1 
A) 900 
B) 200 
C) 100 
D) 10 
E) 1

Question 13

The form of nitrogen most usable to plants is

Accepted Answer

A) ammonium ions 
B) nitrogen gas 
C) proteins 
D) nitrites 
E) nitrates 
A) ammonium ions 
B) nitrogen gas 
C) proteins 
D) nitrites 
E) nitrates

Question 14

-In the figure above, 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 15

Life on earth depends on interaction of gravity, the cycling of matter, and

Accepted Answer

A) cycling of energy 
B) one-way flow of high-quality energy 
C) one-way flow of matter 
D) the destruction of energy 
E) the consumption of matter 
A) cycling of energy 
B) one-way flow of high-quality energy 
C) one-way flow of matter 
D) the destruction of energy 
E) the consumption of matter

Question 16

Humans add sulfur to the atmosphere through which of the following?

Accepted Answer

A) making electricity 
B) making gasoline 
C) converting metallic mined ores to free metals 
D) burning coal 
E) all of these 
A) making electricity 
B) making gasoline 
C) converting metallic mined ores to free metals 
D) burning coal 
E) all of these

Question 17

Since 1950 human activities have more than doubled the annual release of nitrogen into the environment.

Accepted Answer

A) True 
 B)False

Question 18

A "trophic level" refers to the ability of an organism to survive outside the optimum range in a range of tolerance.

Accepted Answer

A) True 
 B)False

Question 19

Because the soil contains a sufficient amount of phosphates, phosphorus is not usually a limiting plant nutrient.

Accepted Answer

A) True 
 B)False

Question 20

Some precipitation sinks through soil and permeable rock formations and into ____________________ where it is stored as ____________________.

Accepted Answer

aquifers;

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

Nitrogen fixation is accomplished by specialized ____________________ in the soil and ____________________ in aquatic environments.

All microbes are pathogenic (disease causing) or otherwise dangerous.

Organisms that feed only on plants are called

The rotten-egg smell coming from volcanoes and anaerobic decomposition in bogs and swamps comes from the gas ____________________.

Sophisticated satellite imaging programs from __________ now allow scientists and non-scientists to be connected to even the most remote ecosystems.

Ecologists would make use of which of the following in their study of nature?

Carbon cycles through the biosphere and depends on the process of ____________________ and ____________________.

The hydrologic cycle is driven primarily by

The rate at which an ecosystem's producers convert solar energy into chemical energy as biomass is called ____________________.

The "greenhouse effect" is a strictly artificial (human-made) phenomenon.

The hydrologic cycle is a way nature renews water quality.

If grass stores 1,000 energy units received from the sun, the ecological efficiency of the ecosystem is 10%, and the trophic levels are grass  cow  human, how many units of energy does the human receive of the original 1,000 units?

The form of nitrogen most usable to plants is

-In the figure above, 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.

Life on earth depends on interaction of gravity, the cycling of matter, and

Humans add sulfur to the atmosphere through which of the following?

Since 1950 human activities have more than doubled the annual release of nitrogen into the environment.

A "trophic level" refers to the ability of an organism to survive outside the optimum range in a range of tolerance.

Because the soil contains a sufficient amount of phosphates, phosphorus is not usually a limiting plant nutrient.

Some precipitation sinks through soil and permeable rock formations and into ____________________ where it is stored as ____________________.

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

Nitrogen fixation is accomplished by specialized in the soil and in aquatic environments.

Carbon cycles through the biosphere and depends on the process of and .

Some precipitation sinks through soil and permeable rock formations and into where it is stored as .