Question 1

Plants cannot fix nitrogen, but legumes are often called nitrogen fixers. Explain why this label is appropriate.

Accepted Answer

Legumes have a mutua

Question 2

Acid deposition is the result of interference with the cycles.

Accepted Answer

A)  hydrologic and nitrogen 
B)  sulfur and hydrologic 
C)  sulfur and nitrogen 
D)  sulfur and phosphorus 
E)  hydrologic and phosphorus 
A)  hydrologic and nitrogen 
B)  sulfur and hydrologic 
C)  sulfur and nitrogen 
D)  sulfur and phosphorus 
E)  hydrologic and phosphorus

Question 3

The amount of energy lost as it passes from one trophic level to another is approximately

Accepted Answer

A)  90%. 
B)  99%. 
C)  50%. 
D)  63%. 
E)  75%. 
A)  90%. 
B)  99%. 
C)  50%. 
D)  63%. 
E)  75%.

Question 4

If a bird eats an insect that ate a plant, the bird is considered a(n)

Accepted Answer

A)  primary consumer. 
B)  secondary consumer. 
C)  autotroph. 
D)  producer. 
E)  tertiary consumer. 
A)  primary consumer. 
B)  secondary consumer. 
C)  autotroph. 
D)  producer. 
E)  tertiary consumer.

Question 5

If the plants in a community produce 500 grams of organic matter per square meter per year that is available for animals in the community to eat, this amount of energy is known as the

Accepted Answer

A)  availability factor of the community. 
B)  trophic factor of the community. 
C)  net primary productivity of the community. 
D)  secondary productivity of the community. 
E)  consumership of the community. 
A)  availability factor of the community. 
B)  trophic factor of the community. 
C)  net primary productivity of the community. 
D)  secondary productivity of the community. 
E)  consumership of the community.

Question 6

The primary cause of the current increase in levels of atmospheric CO2 is the burning of by humans.

Accepted Answer

Question 7

Autotrophs use solar energy to build their own complex organic molecules from inorganic compounds such as water and carbon dioxide.

Accepted Answer

A) True 
 B)False

Question 8

The primary reservoir for the nutrient is rock.

Accepted Answer

The answer of The primary reservoir for the nutrient is...

Question 9

How much of the energy that reaches Earth's outer atmosphere from the sun is available for photosynthesis in plants at Earth's surface?

Accepted Answer

A)  95% 
B)  44% 
C)  71% 
D)  55% 
E)  1% 
A)  95% 
B)  44% 
C)  71% 
D)  55% 
E)  1%

Question 10

One of the basic principles of ecosystems is that cycle within the ecosystems.

Accepted Answer

The answer of One of the basic principles of ecosystems...

Question 11

Human- caused disturbances of the cycle may be contributing to global warming.

Accepted Answer

A)  sulfur 
B)  phosphorus 
C)  carbon 
D)  hydrologic 
E)  oxygen 
A)  sulfur 
B)  phosphorus 
C)  carbon 
D)  hydrologic 
E)  oxygen

Question 12

Each summer, a large "dead zone" devoid of fish and other animals develops where the Mississippi River flows into the Gulf of Mexico. What causes this?

Accepted Answer

A)  There are high levels of mercury in the river water. 
B)  Global warming is making the river water too hot for the fish to tolerate. 
C)  Acid rain makes the gulf's water too acidic to support fish. 
D)  High levels of pesticides are used in the Mississippi River basin. 
E)  Large quantities of fertilizer run off from Midwestern farm fields into the Mississippi River. 
A)  There are high levels of mercury in the river water. 
B)  Global warming is making the river water too hot for the fish to tolerate. 
C)  Acid rain makes the gulf's water too acidic to support fish. 
D)  High levels of pesticides are used in the Mississippi River basin. 
E)  Large quantities of fertilizer run off from Midwestern farm fields into the Mississippi River.

Question 13

Once used by an organism, carbon- and nitrogen- based nutrients are unavailable for other organisms.

Accepted Answer

A) True 
 B)False

Question 14

Detritus feeders remove nutrients from the food chain.

Accepted Answer

A) True 
 B)False

Question 15

One of the basic principles of ecosystems is that moves through the ecosystems in a continuous one- way flow.

Accepted Answer

The answer of One of the basic principles of ecosystems...

Question 16

Grasses and phytoplankton are _.

Accepted Answer

producers,

Question 17

It has been said about global warming that "one human in a developed country is not equivalent to one person in a developing country." What does this statement mean?

Accepted Answer

Each individual in a developed country p

Question 18

In a grassland of Kansas, 1,000 grams of grass are produced per square meter per year by all the different grass species. A theoretical upper limit to the biomass of secondary consumers that can be supported in this ecosystem is

Accepted Answer

A)  10 grams. 
B)  100 grams. 
C)  1,000 grams. 
D)  0.1 gram. 
E)  1 gram. 
A)  10 grams. 
B)  100 grams. 
C)  1,000 grams. 
D)  0.1 gram. 
E)  1 gram.

Question 19

Which of the following terms correctly describes carnivores?

Accepted Answer

A)  Autotrophs 
B)  Detritus consumers 
C)  Secondary consumers 
D)  Primary consumers 
E)  Consumer producers 
A)  Autotrophs 
B)  Detritus consumers 
C)  Secondary consumers 
D)  Primary consumers 
E)  Consumer producers

Question 20

Many climatologists blame the recent extremes in weather on global warning.

Accepted Answer

A) True 
 B)False

Exam 29: Energy Flow and Nutrient Cycling in Ecosystems

Plants cannot fix nitrogen, but legumes are often called nitrogen fixers. Explain why this label is appropriate.

Acid deposition is the result of interference with the cycles.

The amount of energy lost as it passes from one trophic level to another is approximately

If a bird eats an insect that ate a plant, the bird is considered a(n)

If the plants in a community produce 500 grams of organic matter per square meter per year that is available for animals in the community to eat, this amount of energy is known as the

The primary cause of the current increase in levels of atmospheric CO2 is the burning of by humans.

Autotrophs use solar energy to build their own complex organic molecules from inorganic compounds such as water and carbon dioxide.

The primary reservoir for the nutrient is rock.

How much of the energy that reaches Earth's outer atmosphere from the sun is available for photosynthesis in plants at Earth's surface?

One of the basic principles of ecosystems is that cycle within the ecosystems.

Human- caused disturbances of the cycle may be contributing to global warming.

Each summer, a large "dead zone" devoid of fish and other animals develops where the Mississippi River flows into the Gulf of Mexico. What causes this?

Once used by an organism, carbon- and nitrogen- based nutrients are unavailable for other organisms.

Detritus feeders remove nutrients from the food chain.

One of the basic principles of ecosystems is that moves through the ecosystems in a continuous one- way flow.

Grasses and phytoplankton are _.

It has been said about global warming that "one human in a developed country is not equivalent to one person in a developing country." What does this statement mean?

In a grassland of Kansas, 1,000 grams of grass are produced per square meter per year by all the different grass species. A theoretical upper limit to the biomass of secondary consumers that can be supported in this ecosystem is

Which of the following terms correctly describes carnivores?

Many climatologists blame the recent extremes in weather on global warning.

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

Cellular Reproduction

Meiosis: the Basis of Sexual Reproduction

Patterns of Inheritance

Dna: the Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amid Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity II: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

Filters

The primary cause of the current increase in levels of atmospheric CO₂ is the burning of by humans.