Question 1

In the absence of ________,nutrient recycling within the ecosystem would completely stop.

Accepted Answer

A)  rocks 
B)  secondary consumers 
C)  decomposers 
D)  predators 
A)  rocks 
B)  secondary consumers 
C)  decomposers 
D)  predators

Question 2

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

Accepted Answer

A)  Energy flows in two directions in 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 flows in two directions in 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 3

An atom of phosphorous may remain out of the biological part of its cycle for many millions of years.

Accepted Answer

A) True 
 B)False

Question 4

Rainfall naturally has a neutral pH.

Accepted Answer

A) True 
 B)False

Question 5

Rainfall with a low pH is called ________.

Accepted Answer

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

Question 6

If there are 50 kcal of energy in the tertiary consumer trophic level,how many kcal would you expect to find in the primary consumer level?

Accepted Answer

A)  50 
B)  100 
C)  500 
D)  5,000 
A)  50 
B)  100 
C)  500 
D)  5,000

Question 7

Which of the following statements best describes the impact of human activities on the cycling of nutrients in natural systems?

Accepted Answer

A)  Human activities are essentially benign and have little lasting impact on either atmospheric or sedimentary nutrient cycling. 
B)  Human activities have profoundly affected nutrient cycling,particularly with those nutrients that cycle within the atmosphere. 
C)  Human activities such as mining,construction,and road building disrupt the Earth's surface and greatly decrease those nutrients with sedimentary cycling pathways. 
D)  Human activities in general significantly enhance nutrient availability and are almost always associated with ecosystem improvements. 
A)  Human activities are essentially benign and have little lasting impact on either atmospheric or sedimentary nutrient cycling. 
B)  Human activities have profoundly affected nutrient cycling,particularly with those nutrients that cycle within the atmosphere. 
C)  Human activities such as mining,construction,and road building disrupt the Earth's surface and greatly decrease those nutrients with sedimentary cycling pathways. 
D)  Human activities in general significantly enhance nutrient availability and are almost always associated with ecosystem improvements.

Question 8

The marine ecosystem with the lowest net primary productivity is

Accepted Answer

A)  the coral reef. 
B)  the open ocean. 
C)  swamp and marsh areas. 
D)  the ocean upwelling zone. 
A)  the coral reef. 
B)  the open ocean. 
C)  swamp and marsh areas. 
D)  the ocean upwelling zone.

Question 9

A spacecraft crash lands on an airless,lifeless moon.All that survives,along with the crew,are some chickens,cornflakes,and vitamins.The air and water recyclers are functioning.To maximize their food supply until rescued,the crew should

Accepted Answer

A)  feed the cornflakes and vitamins to the chickens,then eat the eggs until rescued. 
B)  kill all the chickens immediately,eat them first,then eat the cornflakes. 
C)  mark each week's survival by eating one chicken. 
D)  ration the chickens first;when they are all eaten,shift to the cornflakes. 
A)  feed the cornflakes and vitamins to the chickens,then eat the eggs until rescued. 
B)  kill all the chickens immediately,eat them first,then eat the cornflakes. 
C)  mark each week's survival by eating one chicken. 
D)  ration the chickens first;when they are all eaten,shift to the cornflakes.

Question 10

Approximately 100 percent of the energy captured from the sun is passed from trophic level to trophic level.

Accepted Answer

A) True 
 B)False

Question 11

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 percent?

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 12

Other than the polar tundra,the LEAST productive biomes tend to be

Accepted Answer

A)  deserts. 
B)  temperate forests. 
C)  tropical forests. 
D)  estuaries. 
A)  deserts. 
B)  temperate forests. 
C)  tropical forests. 
D)  estuaries.

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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

Accepted Answer

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

Exam 24: Ecosystems

In the absence of ________,nutrient recycling within the ecosystem would completely stop.

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

An atom of phosphorous may remain out of the biological part of its cycle for many millions of years.

Rainfall naturally has a neutral pH.

Rainfall with a low pH is called ________.

If there are 50 kcal of energy in the tertiary consumer trophic level,how many kcal would you expect to find in the primary consumer level?

Which of the following statements best describes the impact of human activities on the cycling of nutrients in natural systems?

The marine ecosystem with the lowest net primary productivity is

A spacecraft crash lands on an airless,lifeless moon.All that survives,along with the crew,are some chickens,cornflakes,and vitamins.The air and water recyclers are functioning.To maximize their food supply until rescued,the crew should

Approximately 100 percent of the energy captured from the sun is passed from trophic level to trophic level.

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 percent?

Other than the polar tundra,the LEAST productive biomes tend to be

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

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

The Nature of Science and the Characteristics of Life

The Chemistry of Life

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Cancer and Human Health

Patterns of Inheritance

Chromosomes and Human Genetics

DNA and Genes

From Gene to Protein

DNA Technology

How Evolution Works

The Origin of Species

The Evolution of Biodiversity

Biological Diversity, Bacteria, and Archaea

Protista, Plantae, and Fungi

Animalia

The Biosphere

Growth of Populations

Animal Behavior

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

The Immune System

Reproduction and Development

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

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