Question 1

The primary contribution of decomposers to an ecosystem occurs when they

Accepted Answer

A) capture solar energy. 
B) recycle nutrients sequestered in organisms back to the physical environment. 
C) regulate the number of producers. 
D) prevent consumer overpopulation. 
A) capture solar energy. 
B) recycle nutrients sequestered in organisms back to the physical environment. 
C) regulate the number of producers. 
D) prevent consumer overpopulation.

Question 2

The impacts of acid rain

Accepted Answer

A) are quickly reversed by most soils. 
B) can last for long periods of time. 
C) are almost entirely confined to terrestrial ecosystems. 
D) presently are experienced only in the United States. 
A) are quickly reversed by most soils. 
B) can last for long periods of time. 
C) are almost entirely confined to terrestrial ecosystems. 
D) presently are experienced only in the United States.

Question 3

Which of the following series best represents the energy flow in an ecosystem?

Accepted Answer

A) sun → consumer → producer → heat 
B) consumer → producer → decomposer → sun 
C) producer → consumer → decomposer → sun 
D) sun → producer → consumer → heat 
A) sun → consumer → producer → heat 
B) consumer → producer → decomposer → sun 
C) producer → consumer → decomposer → sun 
D) sun → producer → consumer → heat

Question 4

Eventually, all biomass produced by any organism is consumed by ____________________.

Accepted Answer

The answer of Eventually, all biomass produced by any organism...

Question 5

Nutrients that have a(n)____________________ cycle move relatively quickly through terrestrial and aquatic ecosystems.

Accepted Answer

The answer of Nutrients that have a(n)____________________ cycle move relatively...

Question 6

Secondary productivity can never exceed primary productivity because

Accepted Answer

A) secondary productivity is limited by the amount of energy produced by primary producers. 
B) secondary productivity is less efficient than primary productivity. 
C) energy loss to the surroundings in an ecosystem depends mostly on tertiary consumers. 
D) nutrient cycling is much slower in secondary productivity. 
A) secondary productivity is limited by the amount of energy produced by primary producers. 
B) secondary productivity is less efficient than primary productivity. 
C) energy loss to the surroundings in an ecosystem depends mostly on tertiary consumers. 
D) nutrient cycling is much slower in secondary productivity.

Question 7

The amount of energy that organisms capture in photosynthesis, minus the amount lost as heat from respiration, is called ____________________.

Accepted Answer

net primar

Question 8

Rainfall in some areas of Canada has a high acidity level and a correspondingly high pH.

Accepted Answer

A) True 
 B)False

Question 9

Methane is about 20 times less powerful as a greenhouse gas than carbon dioxide.

Accepted Answer

A) True 
 B)False

Question 10

Biologists use the term ____________________ to refer to the weight of organisms per unit area.

Accepted Answer

The answer of Biologists use the term ____________________ to refer...

Question 11

In an ecosystem, energy differs from nutrients in that

Accepted Answer

A) energy is recycled through photosynthesis, but nutrients are recycled through the atmosphere. 
B) nutrients are recycled, but energy eventually moves out of the system and is lost. 
C) nutrients are recycled through plant roots, but energy is recycled through leaves. 
D) energy is recycled by producers, but nutrients are recycled by consumers. 
A) energy is recycled through photosynthesis, but nutrients are recycled through the atmosphere. 
B) nutrients are recycled, but energy eventually moves out of the system and is lost. 
C) nutrients are recycled through plant roots, but energy is recycled through leaves. 
D) energy is recycled by producers, but nutrients are recycled by consumers.

Question 12

The dead zone that develops in the Gulf of Mexico forms because the large amounts of nitrogen from fertilizers and sewage carried by the Mississippi River

Accepted Answer

A) kill the algae, which are the main food of primary consumers. 
B) cause bacterial populations to grow rapidly and create widespread disease among secondary consumers. 
C) lead eventually to large bacterial populations that deplete deeper waters of oxygen. 
D) are poisonous to bacteria, which are critically important decomposers. 
A) kill the algae, which are the main food of primary consumers. 
B) cause bacterial populations to grow rapidly and create widespread disease among secondary consumers. 
C) lead eventually to large bacterial populations that deplete deeper waters of oxygen. 
D) are poisonous to bacteria, which are critically important decomposers.

Question 13

All areas of the same landmass have the same net primary productivity.

Accepted Answer

A) True 
 B)False

Question 14

The figure below shows the net primary productivity (NPP)in marine biomes around the world.  
The pattern of NPP in marine ecosystems as shown above suggests that

Accepted Answer

A) marine productivity is as sensitive to temperature as terrestrial productivity. 
B) without shade from overhead vegetation, marine productivity typically exceeds that found in terrestrial ecosystems. 
C) marine ecosystems are also limited by sunlight, with the highest productivity at the equator. 
D) most marine productivity results from the input of terrestrially derived nutrients. 
A) marine productivity is as sensitive to temperature as terrestrial productivity. 
B) without shade from overhead vegetation, marine productivity typically exceeds that found in terrestrial ecosystems. 
C) marine ecosystems are also limited by sunlight, with the highest productivity at the equator. 
D) most marine productivity results from the input of terrestrially derived nutrients.

Question 15

Most human-caused environmental damage can be successfully reversed and natural habitats can be reconstructed.

Accepted Answer

A) True 
 B)False

Exam 24: Ecosystems

The primary contribution of decomposers to an ecosystem occurs when they

The impacts of acid rain

Which of the following series best represents the energy flow in an ecosystem?

Eventually, all biomass produced by any organism is consumed by ____________________.

Nutrients that have a(n)____________________ cycle move relatively quickly through terrestrial and aquatic ecosystems.

Secondary productivity can never exceed primary productivity because

The amount of energy that organisms capture in photosynthesis, minus the amount lost as heat from respiration, is called ____________________.

Rainfall in some areas of Canada has a high acidity level and a correspondingly high pH.

Methane is about 20 times less powerful as a greenhouse gas than carbon dioxide.

Biologists use the term ____________________ to refer to the weight of organisms per unit area.

In an ecosystem, energy differs from nutrients in that

The dead zone that develops in the Gulf of Mexico forms because the large amounts of nitrogen from fertilizers and sewage carried by the Mississippi River

All areas of the same landmass have the same net primary productivity.

The figure below shows the net primary productivity (NPP)in marine biomes around the world. The pattern of NPP in marine ecosystems as shown above suggests that

Most human-caused environmental damage can be successfully reversed and natural habitats can be reconstructed.

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

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