Question 1

Seafloor organisms modify their habitat and create new habitats for other organisms.

Accepted Answer

A) True 
 B)False

Question 2

The stem is the part of seaweeds that connects the blade to the holdfast.

Accepted Answer

A) True 
 B)False

Question 3

Common deep-sea vent communities include all of the following except

Accepted Answer

A)   filter-feeding clams and mussels.
B)   fish.
C)   crabs.
D)   deep-water corals.
E)   tubeworms.F) A) and E)
G) B) and E)

Question 4

Eel grass is a marine plant.

Accepted Answer

A) True 
 B)False

Question 5

Vent communities have been discovered making use of many energy sources, including all of the following except

Accepted Answer

A)   hydrothermal vents.
B)   methane seeps.
C)   salt seeps.
D)   radioactive seeps.
E)   cold seeps.F) B) and C)
G) A) and B) D

Question 6

Cold seeps and salt seeps have no associated animal communities.

Accepted Answer

A) True 
 B)False

Question 7

Benthic microalgae are best adapted to living

Accepted Answer

A)   in the rocky intertidal zone
B)   below the euphotic zone.
C)   within shallow sandy or muddy environments.
D)   in tidepools.E) All of the above
F) A) and B)

Question 8

More than 75% of the benthic animals belong to the epifauna.

Accepted Answer

A) True 
 B)False

Question 9

Large benthic algae (seaweeds) have holdfasts that absorb nutrients in the same way roots absorb nutrients for land plants.

Accepted Answer

A) True 
 B)False

Question 10

Most animals that live within the sand and mud feed on detritus.

Accepted Answer

A) True 
 B)False

Question 11

In Washington State, the ________________ acts as a keystone predator; when removed, biodiversity ________________ .

Accepted Answer

A)   sea star; decreases
B)   sea otter; decreases
C)   mussel; increases
D)   sea star; increases
E)   mussel, decreasesF) A) and B)
G) C) and E) A

Question 12

Coral reefs are formed by

Accepted Answer

A)   coral polyps and calcareous algae.
B)   shells and worm tubes.
C)   volcanic action and subsidence.
D)   coral polyps and calcareous algae and shells and worm tubes.
E)   coral polyps and calcareous algae, shells and worm tubes, and volcanic action and subsidence.F) A) and B)
G) A) and E)

Question 13

Sessile organisms live attached to the seafloor.

Accepted Answer

A) True 
 B)False

Question 14

Numbers of organisms and diversity of species decrease as depth increases.

Accepted Answer

A) True 
 B)False

Question 15

Macroalgae/seaweeds can be best differentiated from true plants because macroalgae/seaweeds

Accepted Answer

A)   are photosynthetic.
B)   are prokaryotic.
C)   have no true roots, leaves, or stems.
D)   have no chlorophyll.
E)   are mostly unicellular.F) C) and D)
G) A) and E)

Question 16

Coral bleaching is produced by the invasion of crown of thorns starfish (Acanthaster).

Accepted Answer

A) True 
 B)False  False

Question 17

Human activities are among the greatest threats to the world's coral reefs.

Accepted Answer

A) True 
 B)False

Question 18

Bacteria are not a major source of protein for infaunal organisms.

Accepted Answer

A) True 
 B)False

Question 19

Algae form the base of the trophic system for hydrothermal vent communities.

Accepted Answer

A) True 
 B)False

Question 20

Few algae are found growing on gravel and sand beaches.

Accepted Answer

A) True 
 B)False

Exam 14: The Benthos: Living on the Sea Floor

Seafloor organisms modify their habitat and create new habitats for other organisms.

Correct AnswerverifiedShow Answer

The stem is the part of seaweeds that connects the blade to the holdfast.

Correct AnswerverifiedShow Answer

Common deep-sea vent communities include all of the following except

Correct AnswerverifiedShow Answer

Eel grass is a marine plant.

Correct AnswerverifiedShow Answer

Vent communities have been discovered making use of many energy sources, including all of the following except

Correct AnswerverifiedD

Cold seeps and salt seeps have no associated animal communities.

Correct AnswerverifiedShow Answer

Benthic microalgae are best adapted to living

Correct AnswerverifiedShow Answer

More than 75% of the benthic animals belong to the epifauna.

Correct AnswerverifiedShow Answer

Large benthic algae (seaweeds) have holdfasts that absorb nutrients in the same way roots absorb nutrients for land plants.

Correct AnswerverifiedShow Answer

Most animals that live within the sand and mud feed on detritus.

Correct AnswerverifiedShow Answer

In Washington State, the ________________ acts as a keystone predator; when removed, biodiversity ________________ .

Correct AnswerverifiedA

Coral reefs are formed by

Correct AnswerverifiedShow Answer

Sessile organisms live attached to the seafloor.

Correct AnswerverifiedShow Answer

Numbers of organisms and diversity of species decrease as depth increases.

Correct AnswerverifiedShow Answer

Macroalgae/seaweeds can be best differentiated from true plants because macroalgae/seaweeds

Correct AnswerverifiedShow Answer

Coral bleaching is produced by the invasion of crown of thorns starfish (Acanthaster).

Correct AnswerverifiedFalse

Human activities are among the greatest threats to the world's coral reefs.

Correct AnswerverifiedShow Answer

Bacteria are not a major source of protein for infaunal organisms.

Correct AnswerverifiedShow Answer

Algae form the base of the trophic system for hydrothermal vent communities.

Correct AnswerverifiedShow Answer

Few algae are found growing on gravel and sand beaches.

Correct AnswerverifiedShow Answer

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D

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In Washington State, the acts as a keystone predator; when removed, biodiversity .

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A

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False

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