Question 1

Fresh water makes up about ____ of the world's supply of water.

Accepted Answer

A)  3 percent
B)  10 percent
C)  30 percent
D)  half
E)  90 percentF) A) and E)
G) D) and E)

Question 2

The one nutrient that cannot be categorized as either a sedimentary or a gaseous cycle is

Accepted Answer

A)  nitrogen,because it requires bacteria to convert it into a usable form.
B)  carbon,because it can dissolve into water.
C)  water,because it can exist as a solid,a liquid,or a gas.
D)  carbon,because human activities disturb the natural cycle.
E)  nitrogen,because it must be an ion to be available to producers.F) A) and D)
G) All of the above

Question 3

In the carbon cycle,carbon is returned to the atmosphere by

Accepted Answer

A)  respiration of animals and plants.
B)  photosynthesis.
C)  evaporation of water.
D)  glycolysis.
E)  denitrification.F) B) and D)
G) C) and D)

Question 4

Most natural food chains are only four or five links long,rarely more.The number of trophic levels is limited because

Accepted Answer

A)  there are more predators than herbivores.
B)  the efficiency in the conversion of food eaten at each level is very low,about 10 percent.
C)  winter kills off most insects and stops the food chains.
D)  This is not correct; most food chains are much longer than four or five links.
E)  nutrients cannot be passed after four or five levels.F) B) and E)
G) C) and D)

Question 5

The two general categories of biogeochemical cycles are

Accepted Answer

A)  energy and matter.
B)  terrestrial and aquatic.
C)  gaseous and sedimentary.
D)  chemical and physical.
E)  organic and inorganic.F) A) and D)
G) A) and C)

Question 6

A disruption in which biogeochemical cycle will lead to cultural eutrophication?

Accepted Answer

A)  phosphorus
B)  carbon
C)  nitrogen
D)  hydrological
E)  All of the answer choices are correct.F) D) and E)
G) C) and D)

Question 7

Which of the following does NOT add carbon to the atmosphere?

Accepted Answer

A)  photosynthesis
B)  burning fossil fuels
C)  bicarbonate from aquatic systems
D)  carbon dioxide produced by cellular respiration of plants
E)  carbon dioxide produced by cellular respiration of animalsF) D) and E)
G) All of the above

Question 8

When an herbivore eats,only about 10 percent of the energy it consumes is available for the next trophic level.Discuss where the remaining 90 percent of the consumed energy goes.

Accepted Answer

When an herbivore eats approximately 90 ...

Question 9

In a certain ecosystem,caterpillars eat grass.Field mice eat the caterpillars and seeds from the grass.Snakes eat the mice.Hawks eat both the snakes and mice.Such an arrangement would be considered a(n)

Accepted Answer

A)  food web.
B)  food chain.
C)  ecosystem.
D)  first trophic level.
E)  second trophic level.F) A) and E)
G) A) and C)

Question 10

How is a carnivore like a herbivore?

Accepted Answer

A)  Both pass on all energy received to the next trophic level.
B)  Both tend to produce nutrients for plants.
C)  Both pass on much less energy to the next trophic level than they received.
D)  Both are able to convert organic compounds to ATP without loss of energy.
E)  Both use nutrients released from decomposers.F) B) and D)
G) None of the above

Question 11

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

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) A) and C)
G) C) and E)

Question 13

Inverted ecological pyramids can occur in what habitat?

Accepted Answer

A)  forest canopies
B)  deserts during rare rainfalls
C)  ocean shorelines with algae
D)  any ecosystem disturbed by human activity
E)  If studied closely,inverted pyramids never occur naturally.F) All of the above
G) A) and C)

Question 14

The primary producers in terrestrial ecosystems are the ____,whereas in freshwater and saltwater ecosystems it is ____.

Accepted Answer

A)  autotrophs; heterotrophs
B)  herbivore; carnivore
C)  consumers; producers
D)  algae; green plants
E)  green plants; algaeF) A) and E)
G) B) and E)

Question 15

When deep wells drain aquifers,it is called

Accepted Answer

A)  transpiration.
B)  negative hydrology.
C)  establishing a reservoir.
D)  increasing the transfer rate.
E)  groundwater mining.F) A) and D)
G) A) and E)

Question 16

Which is NOT a consumer?

Accepted Answer

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

Question 17

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 require large amounts of calories for their survival.
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) All of the above

Question 18

Which of the following is usually a limiting factor (nutrient) for plants?

Accepted Answer

A)  nitrogen
B)  nitrites
C)  carbon dioxide
D)  phosphates
E)  hydrogenF) A) and C)
G) A) and D)

Question 19

The ultimate source of energy for the majority of organisms on Earth,including humans,is

Accepted Answer

A)  heat from burning fuels.
B)  heat from muscle contraction.
C)  sunlight.
D)  electric light.
E)  ultraviolet light.F) A) and B)
G) C) and D)

Question 20

The primary consumers that feed directly on green plants are called

Accepted Answer

A)  omnivores.
B)  decomposers.
C)  herbivores.
D)  carnivores.
E)  producers.F) None of the above
G) A) and B)

Exam 35: Nature of Ecosystems

When an herbivore eats,only about 10 percent of the energy it consumes is available for the next trophic level.Discuss where the remaining 90 percent of the consumed energy goes.

Correct AnswerverifiedWhen an herbivore eats approximately 90 ...View AnswerShow Answer

Which of the following is usually a limiting factor (nutrient) for plants?

Correct AnswerverifiedShow Answer

In the carbon cycle,carbon is returned to the atmosphere by

Correct AnswerverifiedShow Answer

The two general categories of biogeochemical cycles are

Correct AnswerverifiedShow Answer

The primary consumers that feed directly on green plants are called

Correct AnswerverifiedShow Answer

The ultimate source of energy for the majority of organisms on Earth,including humans,is

Correct AnswerverifiedShow Answer

When deep wells drain aquifers,it is called

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

The one nutrient that cannot be categorized as either a sedimentary or a gaseous cycle is

Correct AnswerverifiedShow Answer

Which sequence correctly illustrates the most plausible food chain?

Correct AnswerverifiedShow Answer

A disruption in which biogeochemical cycle will lead to cultural eutrophication?

Correct AnswerverifiedShow Answer

Most natural food chains are only four or five links long,rarely more.The number of trophic levels is limited because

Correct AnswerverifiedShow Answer

In a certain ecosystem,caterpillars eat grass.Field mice eat the caterpillars and seeds from the grass.Snakes eat the mice.Hawks eat both the snakes and mice.Such an arrangement would be considered a(n)

Correct AnswerverifiedShow Answer

How are omnivores,carnivores,and herbivores similar?

Correct AnswerverifiedShow Answer

Which of the following does NOT add carbon to the atmosphere?

Correct AnswerverifiedShow Answer

How is a carnivore like a herbivore?

Correct AnswerverifiedShow Answer

Fresh water makes up about ____ of the world's supply of water.

Correct AnswerverifiedShow Answer

Which is NOT a consumer?

Correct AnswerverifiedShow Answer

Inverted ecological pyramids can occur in what habitat?

Correct AnswerverifiedShow Answer

The primary producers in terrestrial ecosystems are the ____,whereas in freshwater and saltwater ecosystems it is ____.

Correct AnswerverifiedShow Answer

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When an herbivore eats approximately 90 ...
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The primary producers in terrestrial ecosystems are the ,whereas in freshwater and saltwater ecosystems it is .

Correct Answer
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