Question 1

Once an organic molecule enters a metabolic pathway, a significant percentage of its energy

Accepted Answer

A) can be recycled through the ecosystem. 
B) will be recovered and used by decomposers. 
C) is lost as unrecoverable heat. 
D) enters the nutrient cycle. 
A) can be recycled through the ecosystem. 
B) will be recovered and used by decomposers. 
C) is lost as unrecoverable heat. 
D) enters the nutrient cycle. C

Question 2

Secondary productivity is always higher than primary productivity.

Accepted Answer

A) True 
 B)False  False

Question 3

An ecosystem service provided by floodplains is to absorb excess flood waters, keeping floods from becoming more severe.

Accepted Answer

A) True 
 B)False  True

Question 4

Which of the following describes the ultimate disposition of most energy in an ecosystem?

Accepted Answer

A) It is used to construct the bodies of decomposers. 
B) It is trapped as fossil fuels when producers die and become fossilized. 
C) It is continuously recycled back into the ecosystem. 
D) It eventually returns to space in the form of heat. 
A) It is used to construct the bodies of decomposers. 
B) It is trapped as fossil fuels when producers die and become fossilized. 
C) It is continuously recycled back into the ecosystem. 
D) It eventually returns to space in the form of heat.

Question 5

Which of the following groups of organisms would not be considered to be consumers?

Accepted Answer

A) herbivores 
B) predators 
C) photosynthesizers 
D) decomposers 
A) herbivores 
B) predators 
C) photosynthesizers 
D) decomposers

Question 6

Which of the following would utilize the highest percentage of net primary productivity?

Accepted Answer

A) producers 
B) decomposers 
C) herbivores 
D) predators 
A) producers 
B) decomposers 
C) herbivores 
D) predators

Question 7

The rate of new biomass production by consumers is called ____________________ production.

Accepted Answer

The answer of The rate of new biomass production by...

Question 8

Nutrients that have an atmospheric cycle

Accepted Answer

A) include carbon, nitrogen, and phosphorus. 
B) may be affected by events that occur in distant parts of the globe. 
C) may become trapped in ocean sediments until tectonic processes elevate the ocean floor. 
D) can quickly become locally depleted and limit NPP. 
A) include carbon, nitrogen, and phosphorus. 
B) may be affected by events that occur in distant parts of the globe. 
C) may become trapped in ocean sediments until tectonic processes elevate the ocean floor. 
D) can quickly become locally depleted and limit NPP.

Question 9

Essential elements required by producers are called nutrients.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following statements about cycling within an ecosystem is false?

Accepted Answer

A) Energy is recycled within an ecosystem. 
B) Carbon is recycled within an ecosystem. 
C) The sedimentary nutrient cycle cycles nutrients very slowly. 
D) Human activities affect nutrient cycling. 
A) Energy is recycled within an ecosystem. 
B) Carbon is recycled within an ecosystem. 
C) The sedimentary nutrient cycle cycles nutrients very slowly. 
D) Human activities affect nutrient cycling.

Question 11

Over time the total amount of nutrients such as carbon and iron present on the Earth increases slightly by their addition from

Accepted Answer

A) meteoric matter from space. 
B) volcanic activity. 
C) nutrient recycling. 
D) electromagnetic radiation. 
A) meteoric matter from space. 
B) volcanic activity. 
C) nutrient recycling. 
D) electromagnetic radiation.

Question 12

Lightning converts atmospheric nitrogen (N₂)to nitrogen compounds that mix with the soil. This is the mechanism by which the majority of nitrogen enters the soil.

Accepted Answer

A) True 
 B)False

Question 13

Sedimentary nutrients

Accepted Answer

A) cycle very slowly and can often become limiting. 
B) are easily replaced if lost from an ecosystem by erosion of the local rock. 
C) are distributed from locally abundant reservoirs through atmospheric circulation. 
D) include carbon, oxygen, nitrogen, and sulfur. 
A) cycle very slowly and can often become limiting. 
B) are easily replaced if lost from an ecosystem by erosion of the local rock. 
C) are distributed from locally abundant reservoirs through atmospheric circulation. 
D) include carbon, oxygen, nitrogen, and sulfur.

Question 14

Which of the following is the dominant type of organism in the two natural terrestrial ecosystems that have the greatest net primary productivity (NPP)?

Accepted Answer

A) grass 
B) trees 
C) food crops 
D) fish 
A) grass 
B) trees 
C) food crops 
D) fish

Question 15

What best explains this observation: consumers directly use approximately 20 percent of a forest's net primary productivity (NPP), whereas decomposers directly use approximately 80?

Accepted Answer

A) Decomposers are more efficient at obtaining energy than consumers. 
B) Forest ecosystems do not have a very high NPP, so they cannot support as many consumers as other ecosystems can. 
C) Consumers eat only certain parts of organisms, such as fruits or muscle tissue, whereas decomposers obtain energy from the entire body of the food organism. 
D) Secondary consumers eat the primary consumers more quickly than the primary consumers can eat the producers, thus leaving most of the NPP available to the decomposers. 
A) Decomposers are more efficient at obtaining energy than consumers. 
B) Forest ecosystems do not have a very high NPP, so they cannot support as many consumers as other ecosystems can. 
C) Consumers eat only certain parts of organisms, such as fruits or muscle tissue, whereas decomposers obtain energy from the entire body of the food organism. 
D) Secondary consumers eat the primary consumers more quickly than the primary consumers can eat the producers, thus leaving most of the NPP available to the decomposers.

Question 16

Which of the following would most likely take longest to replace if lost from a terrestrial ecosystem?

Accepted Answer

A) sulfur 
B) carbon 
C) oxygen 
D) phosphorous 
A) sulfur 
B) carbon 
C) oxygen 
D) phosphorous

Question 17

Cutting a forest to produce paper bags that are quickly discarded could be considered shortsighted; with the majority of its trees removed, the forest will

Accepted Answer

A) experience a significant loss of nutrients as they leech through the soil and into nearby waterways. 
B) not be unable to recover and will eventually be replaced with a desert. 
C) no longer be able to recycle the energy it captures during photosynthesis. 
D) all of the above 
A) experience a significant loss of nutrients as they leech through the soil and into nearby waterways. 
B) not be unable to recover and will eventually be replaced with a desert. 
C) no longer be able to recycle the energy it captures during photosynthesis. 
D) all of the above

Question 18

Primary consumers harvest nearly 100 percent of the energy that producers capture from the sun.

Accepted Answer

A) True 
 B)False

Question 19

Energy cannot be recycled.

Accepted Answer

A) True 
 B)False

Question 20

Rainfall with a low pH is called ____________________.

Accepted Answer

The answer of Rainfall with a low pH is called...

Exam 24: Ecosystems

Once an organic molecule enters a metabolic pathway, a significant percentage of its energy

Secondary productivity is always higher than primary productivity.

An ecosystem service provided by floodplains is to absorb excess flood waters, keeping floods from becoming more severe.

Which of the following describes the ultimate disposition of most energy in an ecosystem?

Which of the following groups of organisms would not be considered to be consumers?

Which of the following would utilize the highest percentage of net primary productivity?

The rate of new biomass production by consumers is called ____________________ production.

Nutrients that have an atmospheric cycle

Essential elements required by producers are called nutrients.

Which of the following statements about cycling within an ecosystem is false?

Over time the total amount of nutrients such as carbon and iron present on the Earth increases slightly by their addition from

Lightning converts atmospheric nitrogen (N₂)to nitrogen compounds that mix with the soil. This is the mechanism by which the majority of nitrogen enters the soil.

Sedimentary nutrients

Which of the following is the dominant type of organism in the two natural terrestrial ecosystems that have the greatest net primary productivity (NPP)?

What best explains this observation: consumers directly use approximately 20 percent of a forest's net primary productivity (NPP), whereas decomposers directly use approximately 80?

Which of the following would most likely take longest to replace if lost from a terrestrial ecosystem?

Cutting a forest to produce paper bags that are quickly discarded could be considered shortsighted; with the majority of its trees removed, the forest will

Primary consumers harvest nearly 100 percent of the energy that producers capture from the sun.

Energy cannot be recycled.

Rainfall with a low pH is called ____________________.

The Nature of Science and the Characteristics of Life

Biological Diversity, Bacteria, and Archaea

Protista, Plantae, and Fungi

Animalia

The Chemistry of Life

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Stem Cells, Cancer, and Human Health

Patterns of Inheritance

Chromosomes and Human Genetics

Dna and Genes

From Gene to Protein

Dna Technology

How Evolution Works

Evolution of Populations

Speciation and the Origins of Biological Diversity

The Evolutionary History of Life

The Biosphere

Growth of Populations

Ecological Communities

Global Change

Internal Organization and Homeostasis

Nutrition and Digestion

Circulation and Gas Exchange

Animal Hormones

Nervous and Sensory Systems

Skeletons, Muscles, and Movement

Defenses Against Disease

Reproduction and Development

Animal Behavior

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

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