Question 1

Energy can be depleted within an ecosystem.

Accepted Answer

A) True 
 B)False

Question 2

Some scientists predict that as atmospheric carbon dioxide levels increase,the pH of the oceans will drop,threatening coral and organisms with shells.What is the best explanation for this hypothesis?

Accepted Answer

A)  Carbon dioxide combines with water to form a base.
B)  Carbon dioxide combines with water to form an acid.
C)  As the pH of the ocean decreases,more carbon dioxide is released into the atmosphere.
D)  As the pH of the ocean increases,more carbon dioxide is released into the atmosphere.
E)  As the oceans warm,more water is evaporated,lowering the pH of the remaining water.F) B) and C)
G) A) and B)

Question 3

Zooplankton are which of the following?

Accepted Answer

A)  tertiary consumers
B)  secondary consumers
C)  producers
D)  decomposers
E)  primary consumersF) None of the above
G) B) and C)

Question 4

All the organisms plus the nonliving components of a defined area is a(n)

Accepted Answer

A)  population.
B)  community.
C)  ecosystem.
D)  habitat.
E)  nichE.F) None of the above
G) C) and E)

Question 5

Energy flows in only one direction through an ecosystem,rather than being recycled.

Accepted Answer

A) True 
 B)False

Question 6

Trees that lose only a few leaves at a time are

Accepted Answer

A)  deciduous trees.
B)  carnivorous trees.
C)  maple trees.
D)  hickory trees.
E)  coniferous trees.F) A) and C)
G) C) and D)

Question 7

An insect that resembles leaves is using ______ to avoid predation.

Accepted Answer

A)  camouflage
B)  warning coloration
C)  mimicry
D)  chemical defense
E)  mutualismF) All of the above
G) A) and E)

Question 8

A network of interconnected food chains is a food web.

Accepted Answer

A) True 
 B)False

Question 9

In ______,multiple species use the same resource in a slightly different way or at a different time.

Accepted Answer

A)  symbiotic inclusion
B)  resource partitioning
C)  mutualism
D)  intraspecific competition
E)  None of the answers are correct.F) None of the above
G) B) and D)

Question 10

Nitrogen-fixing bacteria convert N2 into

Accepted Answer

A)  nitrates.
B)  ammonium ions.
C)  nitrites.
D)  carbon dioxide.
E)  methanE.F) All of the above
G) B) and C)

Question 11

Raw sewage within a water ecosystem can cause fish kills because respiration by the microbes in the sewage reduces the concentration of oxygen within the water.

Accepted Answer

A) True 
 B)False

Question 12

The diversity in a mangrove marsh community is high if

Accepted Answer

A)  the proportion of red mangroves,white mangroves,and black mangroves is equal.
B)  the proportion of red mangroves is far greater than white mangroves and black mangroves.
C)  there are a few species of mangroves,a few species of invertebrate animals,and a few species of vertebrate animals.
D)  All answers are correct.E) B) and C)
F) B) and D)

Question 13

Abiotic components of an ecosystem include

Accepted Answer

A)  living components only.
B)  both nonliving and living components.
C)  only plant life.
D)  nonliving components only.
E)  only animal lifE.F) A) and C)
G) A) and E)

Question 14

A species that is so important to its community that its removal can dismantle a food web (such as sea otters) is termed a

Accepted Answer

A)  capstone species.
B)  flagstone species.
C)  cobblestone species.
D)  cornerstone species.
E)  keystone species.F) B) and D)
G) None of the above

Question 15

Desert plants often have

Accepted Answer

A)  broad leaves.
B)  thick vines.
C)  long taproots.
D)  shallow roots.
E)  soft bark.F) A) and B)
G) B) and E)

Question 16

In the water cycle,animals return water to the environment by

Accepted Answer

A)  both transpiration and excretion.
B)  excretion only.
C)  transpiration only
D)  both respiration and excretion
E)  excretion only..F) A) and B)
G) D) and E)

Question 17

The Boundary Waters Canoe Area (BWCA) is an example of which biome?

Accepted Answer

A)  boreal forest
B)  tropical rainforest
C)  short grass prairie
D)  tundra
E)  temperate rainforestF) All of the above
G) C) and D)

Question 18

Coral and the algae which live inside the coral tissues are an example of

Accepted Answer

A)  mutualism.
B)  commensalism.
C)  parasitism.
D)  predation.
E)  competition.F) A) and E)
G) B) and C)

Question 19

The ______ cycle begins with the weathering of rock.

Accepted Answer

A)  phosphorus
B)  nitrogen
C)  water
D)  energy
E)  carbonF) A) and E)
G) A) and C)

Question 20

Species that are the first to colonize an area are termed

Accepted Answer

A)  keystone species.
B)  primary species.
C)  tertiary species.
D)  pioneer species.
E)  secondary species.F) A) and B)
G) B) and E)

Exam 19: Communities and Ecosystems

An insect that resembles leaves is using ______ to avoid predation.

Correct AnswerverifiedShow Answer

A species that is so important to its community that its removal can dismantle a food web (such as sea otters) is termed a

Correct AnswerverifiedShow Answer

All the organisms plus the nonliving components of a defined area is a(n)

Correct AnswerverifiedShow Answer

Some scientists predict that as atmospheric carbon dioxide levels increase,the pH of the oceans will drop,threatening coral and organisms with shells.What is the best explanation for this hypothesis?

Correct AnswerverifiedShow Answer

Energy can be depleted within an ecosystem.

Correct AnswerverifiedShow Answer

Energy flows in only one direction through an ecosystem,rather than being recycled.

Correct AnswerverifiedShow Answer

The ______ cycle begins with the weathering of rock.

Correct AnswerverifiedShow Answer

Nitrogen-fixing bacteria convert N2 into

Correct AnswerverifiedShow Answer

Trees that lose only a few leaves at a time are

Correct AnswerverifiedShow Answer

Coral and the algae which live inside the coral tissues are an example of

Correct AnswerverifiedShow Answer

Species that are the first to colonize an area are termed

Correct AnswerverifiedShow Answer

Desert plants often have

Correct AnswerverifiedShow Answer

The Boundary Waters Canoe Area (BWCA) is an example of which biome?

Correct AnswerverifiedShow Answer

Abiotic components of an ecosystem include

Correct AnswerverifiedShow Answer

The diversity in a mangrove marsh community is high if

Correct AnswerverifiedShow Answer

Zooplankton are which of the following?

Correct AnswerverifiedShow Answer

In the water cycle,animals return water to the environment by

Correct AnswerverifiedShow Answer

Raw sewage within a water ecosystem can cause fish kills because respiration by the microbes in the sewage reduces the concentration of oxygen within the water.

Correct AnswerverifiedShow Answer

In ______,multiple species use the same resource in a slightly different way or at a different time.

Correct AnswerverifiedShow Answer

A network of interconnected food chains is a food web.

Correct AnswerverifiedShow Answer

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Nitrogen-fixing bacteria convert N₂ into

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