Question 1

Compared to the numbers of grasshoppers or deer,there are few mountain lions.The reason that large and fierce animals,such as the mountain lion,are rare in an ecosystem is that

Accepted Answer

A)   such animals do not tolerate other members like them.
B)   through evolution, most fierce animals have been killed off by others.
C)   food chains are only 10-20% efficient at each step and top carnivores are physically limited in how far they can roam for food.
D)   only a few such animals are permitted by succession in a biome and there are only a few biomes.
E)   more large predators bring more disease to an ecosystem.F) A) and D)
G) B) and C)

Question 2

Once a nutrient enters an ecosystem it

Accepted Answer

A)   Must remain in that ecosystem
B)   Can cycle endlessly in that ecosystem
C)   Must leave that ecosystem to enter into an organism
D)   Cannot leave that ecosystem
E)   Can only leave that ecosystem if it is carried by a living organismF) None of the above
G) B) and E)

Question 3

Which sequence correctly illustrates the most plausible food chain?

Accepted Answer

A)   algae, insect larvae, fish, humans
B)   algae, fish, insect larvae, humans
C)   insect larvae, algae, fish, humans
D)   fish, insect larvae, algae, humans
E)   humans, fish, insect larvae, algaeF) B) and E)
G) A) and C)

Question 4

Fungi and bacteria are detritus-feeders,also known as

Accepted Answer

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

Question 5

Which biogeochemical cycle is directly associated with fossil fuels?

Accepted Answer

A)   carbon
B)   nitrogen
C)   hydrological
D)   phosphorus
E)   All of these are directly associated with fossil fuels.F) B) and E)
G) A) and E)

Question 6

Animals that feed on both plants and other animals are called

Accepted Answer

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

Question 7

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

Accepted Answer

A)   carbon
B)   nitrogen
C)   water
D)   energy
E)   phosphorusF) C) and D)
G) A) and D)

Question 8

The primary consumers that feed directly on green plants are called

Accepted Answer

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

Question 9

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) None of the above

Question 10

Atmospheric CO2 combines with water to produce a bicarbonate which is

Accepted Answer

A)   a cause of the greenhouse effect.
B)   ozone.
C)   a source of carbon for algae.
D)   photochemical smog.
E)   a thermal inversion.F) B) and D)
G) C) and D)

Question 11

Which is NOT true about a complex food web?

Accepted Answer

A)   It remains stable.
B)   Populations tend to remain about the same size.
C)   Energy levels remain about the same for all trophic levels.
D)   Inputs are constant and outputs are minimal except for heat.
E)   Most of the energy entering the system maintains the whole community.F) A) and B)
G) None of the above

Question 12

How are omnivores,carnivores,and herbivores similar?

Accepted Answer

A)   They are all producers.
B)   They are all consumers and produce oxygen.
C)   They all produce their own food.
D)   They all produce oxygen.
E)   They are all consumers and produce carbon dioxide.F) B) and D)
G) A) and B)

Question 13

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

Accepted Answer

A)   An exchange pool where the nutrient is readily available to producers; reservoirs that serve as long term storage and living organisms that act as short term storage.
B)   An exchange pool that serves as long term storage; reservoirs where the nutrient is readily available to producers and living organisms that act as short term storage.
C)   An exchange pool that serves as short term storage; reservoirs where the nutrient is readily available to producers and living organisms that act as long term storage.
D)   An exchange pool that acts as short term storage; reservoirs that act as long term storage and living organisms where the nutrient is readily available to producers.
E)   An exchange pool that serves as long term storage; reservoirs that act as short term storage and living organisms where the nutrient is readily available to producers.F) B) and C)
G) A) and B)

Question 14

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) B) and D)
G) A) and E)

Question 15

Concerning the nitrogen cycle,which of these is NOT true?

Accepted Answer

A)   It requires a number of different types of bacteria.
B)   Plants can take in and use nitrogen from the air by using their leaves.
C)   Ammonium in the soil is converted to nitrite by nitrite-producing bacteria and then nitrite- is converted to nitrate by nitrate producing bacteria.
D)   Eventually, organic nitrogen becomes inorganic nitrogen again.
E)   Human activities increase the nitrogen fixation rate.F) None of the above
G) B) and C)

Question 16

Can your house cat survive on the annual productivity of a typical city backyard,or must it be given food supplements?

Accepted Answer

A)   It can survive.
B)   It must be fed additional food or it will starve.
C)   More information is needed to answer this question.
D)   It depends on what type of plants you grow in the yard.
E)   A city backyard is not enough living space for your cat.F) C) and D)
G) A) and E)

Question 17

When pioneers move into a wooded area,they slash and burn the woods,increasing grass production.Initially,they are likely to see

Accepted Answer

A)   foxes increase.
B)   squirrels increase.
C)   grasshoppers increase.
D)   hawks decrease.
E)   grasshoppers decrease.F) A) and D)
G) D) and E)

Question 18

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 activitiesF) A) and B)
G) A) and C)

Question 19

The greenhouse effect is

Accepted Answer

A)   due to increased sunlight in recent years.
B)   caused by increased plant life and photosynthesis.
C)   a natural phenomenon due to absorption of sunlight and re-radiating of the heat.
D)   a manmade hazard due to decreased levels of carbon dioxide and ozone in the atmosphere in recent years.
E)   not affected by human activities.F) D) and E)
G) B) and E)

Question 20

Ecologists have found that

Accepted Answer

A)   life as we know it does not match the energy laws of physics.
B)   ecology cannot be explained using principles from chemistry and physics.
C)   it is possible to capture all the photosynthetic energy absorbed in a molecule of glucose.
D)   energy flows one way through an ecosystem and requires an external input.
E)   inorganic elements flow through an ecosystem.F) B) and C)
G) A) and D)

Exam 35: Nature of Ecosystems

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

Correct Answer
verified

How are omnivores,carnivores,and herbivores similar?

Correct Answer
verified

The primary consumers that feed directly on green plants are called

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Ecologists have found that

Correct Answer
verified

The greenhouse effect is

Correct Answer
verified

Fungi and bacteria are detritus-feeders,also known as

Correct Answer
verified

When pioneers move into a wooded area,they slash and burn the woods,increasing grass production.Initially,they are likely to see

Correct Answer
verified

Compared to the numbers of grasshoppers or deer,there are few mountain lions.The reason that large and fierce animals,such as the mountain lion,are rare in an ecosystem is that

Correct Answer
verified

Which sequence correctly illustrates the most plausible food chain?

Correct Answer
verified

Once a nutrient enters an ecosystem it

Correct Answer
verified

Concerning the nitrogen cycle,which of these is NOT true?

Correct Answer
verified

Which is NOT true about a complex food web?

Correct Answer
verified

Animals that feed on both plants and other animals are called

Correct Answer
verified

Atmospheric CO₂ combines with water to produce a bicarbonate which is

Correct Answer
verified

Can your house cat survive on the annual productivity of a typical city backyard,or must it be given food supplements?

Correct Answer
verified

Which biogeochemical cycle is directly associated with fossil fuels?

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Exam 35: Nature of Ecosystems

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

Correct AnswerverifiedShow Answer

How are omnivores,carnivores,and herbivores similar?

Correct AnswerverifiedShow Answer

The primary consumers that feed directly on green plants are called

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Ecologists have found that

Correct AnswerverifiedShow Answer

The greenhouse effect is

Correct AnswerverifiedShow Answer

Fungi and bacteria are detritus-feeders,also known as

Correct AnswerverifiedShow Answer

When pioneers move into a wooded area,they slash and burn the woods,increasing grass production.Initially,they are likely to see

Correct AnswerverifiedShow Answer

Compared to the numbers of grasshoppers or deer,there are few mountain lions.The reason that large and fierce animals,such as the mountain lion,are rare in an ecosystem is that

Correct AnswerverifiedShow Answer

Which sequence correctly illustrates the most plausible food chain?

Correct AnswerverifiedShow Answer

Once a nutrient enters an ecosystem it

Correct AnswerverifiedShow Answer

Concerning the nitrogen cycle,which of these is NOT true?

Correct AnswerverifiedShow Answer

Which is NOT true about a complex food web?

Correct AnswerverifiedShow Answer

Animals that feed on both plants and other animals are called

Correct AnswerverifiedShow Answer

Atmospheric CO2 combines with water to produce a bicarbonate which is

Correct AnswerverifiedShow Answer

Can your house cat survive on the annual productivity of a typical city backyard,or must it be given food supplements?

Correct AnswerverifiedShow Answer

Which biogeochemical cycle is directly associated with fossil fuels?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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Correct Answer
verified

Atmospheric CO₂ combines with water to produce a bicarbonate which is

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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