Question 1

In the following food chain,which organism is at the third trophic level? 
grass  →\rarr→  rabbits  →\rarr→  snakes  →\rarr→  hawks  →\rarr→  foxes

Accepted Answer

A)   grass
B)   rabbits
C)   snakes
D)   hawks
E)   foxes F) A) and B)
G) A) and C)

Question 2

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

Question 3

Which of the following organisms would be considered a decomposer?

Accepted Answer

A)   green algae
B)   green plant
C)   caterpillar
D)   bird
E)   mushroomF) None of the above
G) C) and E)

Question 4

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) None of the above

Question 5

Nitrification refers to the production of

Accepted Answer

A)   nitrogen gas.
B)   nitrate.
C)   nitrite.
D)   ammonia.
E)   ammonium.F) A) and E)
G) All of the above B

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) A) and B)
G) All of the above

Question 7

The first step in the use of carbon by living organisms occurs in

Accepted Answer

A)   humans.
B)   vertebrates.
C)   invertebrates.
D)   green plants.
E)   soil bacteria.F) A) and E)
G) A) and D)

Question 8

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) B) and E)
G) C) and D)

Question 9

Which is NOT a consumer?

Accepted Answer

A)   omnivore
B)   herbivore
C)   detritivores
D)   autotroph
E)   carnivoreF) A) and B)
G) All of the above D

Question 10

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 B)
G) A) and C)

Question 11

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 be herbivores that 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 release from decomposers.F) A) and E)
G) All of the above

Question 12

In a grazing food chain,

Accepted Answer

A)   all the consumers are primary consumers.
B)   primary consumers eat photosynthetic organisms.
C)   primary consumers eat detritus.
D)   secondary consumers eat photosynthetic organisms.
E)   secondary consumers eat detritus.F) C) and D)
G) B) and D)

Question 13

Deposits of coal are important in the carbon cycle because they

Accepted Answer

A)   Keep humans from burning more trees by serving as fuel source.
B)   Serve as a reservoir of carbon that will eventually be released into the ecosystem.
C)   Lock up carbon so that it can never be returned to the atmosphere to make global warming increase.
D)   Make carbon readily available to plants through their roots growing down into the coal deposit.
E)   Serve as short term storage for carbons.F) B) and C)
G) A) and E)

Question 14

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

Question 15

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 E)
G) B) and C)

Question 16

In a grassland biome which organism would most likely be at the highest trophic level?

Accepted Answer

A)   hawk
B)   big bluestem grass
C)   sparrow
D)   caterpillar
E)   mouseF) A) and E)
G) D) and E)

Question 17

In an experiment carried out to study the energy flow through an ecosystem scientists measure the total solar energy captured by plants to be 10,000 kilocalories.The portion of this available to the third trophic level will be

Accepted Answer

A)   10000 kilocalories
B)   1000 kilocalories
C)   100 kilocalories
D)   10 kilocalories
E)   1 kilocalorieF) A) and B)
G) A) and C)

Question 18

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) C) and D)
G) A) and B)

Question 19

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) A) and D) D

Question 20

When a plant produces food by photosynthesis,what is the fate of food stored as sugars,starches,etc.?

Accepted Answer

A)   All of the food stored by plants is eventually consumed by animal consumers.
B)   All of the food stored by plants is eventually consumed by either animals or decomposers.
C)   Most of the plant is consumed by animals and very little is consumed by decomposers.
D)   A portion of the food is used by the plant itself in cellular respiration and the rest is consumed by animals or by decomposers.
E)   A majority of the food is used by the plant itself in cellular respiration and very little is consumed by animals or by decomposers.F) A) and B)
G) A) and C)

Exam 35: Nature of Ecosystems

In the following food chain,which organism is at the third trophic level? grass →\rarr→ rabbits →\rarr→ snakes →\rarr→ hawks →\rarr→ foxes

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following organisms would be considered a decomposer?

Correct AnswerverifiedShow Answer

Which type of organism produces food in an ecosystem?

Correct AnswerverifiedShow Answer

Nitrification refers to the production of

Correct AnswerverifiedB

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

The first step in the use of carbon by living organisms occurs in

Correct AnswerverifiedShow Answer

An ecosystem consists of what two components?

Correct AnswerverifiedShow Answer

Which is NOT a consumer?

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

How is a carnivore like a herbivore?

Correct AnswerverifiedShow Answer

In a grazing food chain,

Correct AnswerverifiedShow Answer

Deposits of coal are important in the carbon cycle because they

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In a grassland biome which organism would most likely be at the highest trophic level?

Correct AnswerverifiedShow Answer

In an experiment carried out to study the energy flow through an ecosystem scientists measure the total solar energy captured by plants to be 10,000 kilocalories.The portion of this available to the third trophic level will be

Correct AnswerverifiedShow Answer

The two general categories of biogeochemical cycles are

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

When a plant produces food by photosynthesis,what is the fate of food stored as sugars,starches,etc.?

Correct AnswerverifiedShow Answer

In the following food chain,which organism is at the third trophic level? grass $\rarr$ rabbits $\rarr$ snakes $\rarr$ hawks $\rarr$ foxes

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B

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D

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

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D

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