Question 1

Given that most nutrients can dissolve into water,which of the following statements is false?

Accepted Answer

A)  Runoff water can pollute a pond,stream,or lake if excess nutrients are carried in the water.
B)  Water can carry nutrients into the soil,where they are available to plants through their roots.
C)  Water can leach nutrients out of the soil and carry it away from an ecosystem.
D)  N2 dissolves into water droplets and is carried to the earth to be used by producers.
E)  Carbon dioxide dissolves into water and is then available to aquatic producers.F) B) and C)
G) A) and E) D

Question 2

Animals that feed on both plants and other animals are called

Accepted Answer

A)  herbivores.
B)  carnivores.
C)  omnivores.
D)  decomposers.
E)  detritivores.F) A) and D)
G) C) and D)

Question 3

Which kind of organism would be most likely to perform photosynthesis?

Accepted Answer

A)  omnivore
B)  herbivore
C)  decomposer
D)  autotroph
E)  carnivoreF) B) and E)
G) A) and D)

Question 4

Which statement is TRUE about the water (hydrologic) cycle?

Accepted Answer

A)  Because this is a true cycle,it is impossible to run out of fresh water for human use.
B)  Some water evaporates from land and from plants.
C)  All water molecules that evaporate from the ocean precipitate on land and move by gravity through groundwater to the ocean again.
D)  Once water sinks into the ground,it is safe from human exploitation or pollution until it has rejoined the ocean.
E)  The main source of water in the atmosphere is from evaporation over landmasses.F) C) and E)
G) A) and E) B

Question 5

Someone asks if some of the carbon atoms in their body may have once made up the living tissues of another person or animal in earlier times.This is

Accepted Answer

A)  possible only if you are a cannibal.
B)  possible since carbon cycles through the ecosystem.
C)  impossible since carbon can't enter a living system more than once.
D)  highly unlikely since carbon is always tied up in molecules in organisms or minerals.
E)  impossible since carbon molecules are specific for different organisms.F) A) and E)
G) All of the above

Question 6

Consider the components of a four-step food chain: producers,herbivores,carnivores,top predators.If everything is eaten at each level,how much of the energy stored by a producer is passed to the top predator?

Accepted Answer

A)  100%
B)  10%
C)  1%
D)  0.1%
E)  0.01%F) B) and E)
G) B) and C)

Question 7

An ecosystem consists of what two components?

Accepted Answer

A)  grazing and detritus food chains
B)  habitat and niches
C)  biotic and abiotic factors
D)  trophic and eutrophic factors
E)  water and temperatureF) A) and B)
G) A) and C)

Question 8

The only heterotrophs required for an ecosystem to function are

Accepted Answer

A)  omnivores.
B)  herbivores.
C)  decomposers.
D)  autotrophs.
E)  carnivores.F) C) and D)
G) A) and D)

Question 9

Which pyramid illustrates that at each successive trophic level there is a decreasing amount of energy available?

Accepted Answer

A)  a pyramid representing the number of organisms at each level
B)  biomass pyramid of organisms at each level
C)  ecological pyramid of organisms at each level
D)  food chain
E)  food webF) A) and E)
G) All of the above

Question 10

The three locations where a nutrient may be found in an ecosystem are in order of

Accepted Answer

A)  nutrient/producer,reservoir/long-term storage,and organism/short-term storage.
B)  exchange pool/long-term storage,reservoir/nutrients for producers,and organisms/short-term storage.
C)  exchange pool/short-term storage,reservoir/nutrients for producers,and organisms/long-term storage.
D)  exchange pool/short-term storage,reservoir/long-term storage,and organisms/nutrients available to producers.
E)  exchange pool/long-term storage,reservoir/short-term storage,and organisms/nutrients available to producers.F) D) and E)
G) All of the above

Question 11

Which eats only plant foods?

Accepted Answer

A)  omnivore
B)  herbivore
C)  decomposer
D)  autotroph
E)  carnivoreF) None of the above
G) A) and D)

Question 12

Which of the following is NOT necessary to keep a balanced (stable) ecosystem going?

Accepted Answer

A)  Matter (i.e.,elements) has to cycle.
B)  There must be an outside energy source.
C)  Various populations of producers and consumers must be proportional.
D)  Bacteria and fungi should be eliminated.
E)  Energy must be allowed to flow through the ecosystem.F) A) and E)
G) All of the above

Question 13

The base of an ecological pyramid represents the

Accepted Answer

A)  producer trophic level.
B)  primary consumer trophic level.
C)  secondary consumer trophic level.
D)  top predator trophic level.
E)  decomposer trophic level.F) A) and B)
G) C) and D)

Question 14

Atmospheric carbon serves as

Accepted Answer

A)  an exchange pool for carbon that is available to plants for photosynthesis.
B)  a long-term storage reservoir that becomes available to plants through the action of bacteria.
C)  an exchange pool for carbon that is made available to plants through the action of bacteria.
D)  a reservoir of carbon that will eventually be released into the ecosystem through the process of weathering.
E)  a storage reservoir of carbon that is part of the sedimentary cycle of carbon.F) A) and B)
G) A) and C)

Question 15

What happens to the amount of available energy as you progress up the food pyramid?

Accepted Answer

A)  The amount of energy decreases.
B)  The amount of energy increases.
C)  The amount of energy stays the same.
D)  The amount of energy first decreases and then finally increases.
E)  Energy does not move from one trophic level to the next.F) B) and D)
G) A) and C)

Question 16

In the biosphere,which of the following is NOT constantly recycled?

Accepted Answer

A)  carbon
B)  nitrogen
C)  water
D)  energy
E)  phosphorusF) None of the above
G) A) and B)

Question 17

You buy a house on a small inland lake and your front lawn ends at the water's edge.A lawn care company representative suggests you fertilize the lawn to keep it lush and green.You agree to the treatment and then discover there is a major weed problem in the lake.The most likely cause of the weed problem is

Accepted Answer

A)  nitrogen.
B)  nitrites.
C)  sulfates.
D)  phosphates.
E)  carbon.F) C) and D)
G) C) and E)

Question 18

The conversion of nitrate to nitrogen gas is achieved by ____ bacteria.

Accepted Answer

A)  denitrifying
B)  leguminous
C)  nitrogen-fixing
D)  nitrate-producing
E)  nitrite-producingF) D) and E)
G) A) and C)

Question 19

Which type of organism produces food in an ecosystem?

Accepted Answer

A)  heterotroph
B)  autotroph
C)  consumer
D)  carnivore
E)  herbivoreF) C) and D)
G) All of the above B

Question 20

Which of the following is NOT true of the phosphorus cycle?

Accepted Answer

A)  Phosphorus never enters the atmosphere.
B)  Phosphate only becomes available when a geological upheaval exposes sedimentary rocks.
C)  Phosphate is often a limiting nutrient in most ecosystems.
D)  Phosphate detergents are a major source of eutrophication.
E)  The phosphorous cycle is not affected by human activities.F) All of the above
G) B) and D)

Exam 35: Nature of Ecosystems

Given that most nutrients can dissolve into water,which of the following statements is false?

Correct Answer
verified
D

Animals that feed on both plants and other animals are called

Correct Answer
verified

Which kind of organism would be most likely to perform photosynthesis?

Correct Answer
verified

Which statement is TRUE about the water (hydrologic) cycle?

Correct Answer
verified
B

Someone asks if some of the carbon atoms in their body may have once made up the living tissues of another person or animal in earlier times.This is

Correct Answer
verified

Consider the components of a four-step food chain: producers,herbivores,carnivores,top predators.If everything is eaten at each level,how much of the energy stored by a producer is passed to the top predator?

Correct Answer
verified

An ecosystem consists of what two components?

Correct Answer
verified

The only heterotrophs required for an ecosystem to function are

Correct Answer
verified

Which pyramid illustrates that at each successive trophic level there is a decreasing amount of energy available?

Correct Answer
verified

The three locations where a nutrient may be found in an ecosystem are in order of

Correct Answer
verified

Which eats only plant foods?

Correct Answer
verified

Which of the following is NOT necessary to keep a balanced (stable) ecosystem going?

Correct Answer
verified

The base of an ecological pyramid represents the

Correct Answer
verified

Atmospheric carbon serves as

Correct Answer
verified

What happens to the amount of available energy as you progress up the food pyramid?

Correct Answer
verified

In the biosphere,which of the following is NOT constantly recycled?

Correct Answer
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Correct Answer
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The conversion of nitrate to nitrogen gas is achieved by ____ bacteria.

Correct Answer
verified

Which type of organism produces food in an ecosystem?

Correct Answer
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B

Which of the following is NOT true of the phosphorus cycle?

Correct Answer
verified

Exam 35: Nature of Ecosystems

Given that most nutrients can dissolve into water,which of the following statements is false?

Correct AnswerverifiedD

Animals that feed on both plants and other animals are called

Correct AnswerverifiedShow Answer

Which kind of organism would be most likely to perform photosynthesis?

Correct AnswerverifiedShow Answer

Which statement is TRUE about the water (hydrologic) cycle?

Correct AnswerverifiedB

Someone asks if some of the carbon atoms in their body may have once made up the living tissues of another person or animal in earlier times.This is

Correct AnswerverifiedShow Answer

Consider the components of a four-step food chain: producers,herbivores,carnivores,top predators.If everything is eaten at each level,how much of the energy stored by a producer is passed to the top predator?

Correct AnswerverifiedShow Answer

An ecosystem consists of what two components?

Correct AnswerverifiedShow Answer

The only heterotrophs required for an ecosystem to function are

Correct AnswerverifiedShow Answer

Which pyramid illustrates that at each successive trophic level there is a decreasing amount of energy available?

Correct AnswerverifiedShow Answer

The three locations where a nutrient may be found in an ecosystem are in order of

Correct AnswerverifiedShow Answer

Which eats only plant foods?

Correct AnswerverifiedShow Answer

Which of the following is NOT necessary to keep a balanced (stable) ecosystem going?

Correct AnswerverifiedShow Answer

The base of an ecological pyramid represents the

Correct AnswerverifiedShow Answer

Atmospheric carbon serves as

Correct AnswerverifiedShow Answer

What happens to the amount of available energy as you progress up the food pyramid?

Correct AnswerverifiedShow Answer

In the biosphere,which of the following is NOT constantly recycled?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The conversion of nitrate to nitrogen gas is achieved by ____ bacteria.

Correct AnswerverifiedShow Answer

Which type of organism produces food in an ecosystem?

Correct AnswerverifiedB

Which of the following is NOT true of the phosphorus cycle?

Correct AnswerverifiedShow Answer

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D

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B

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B

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