Question 1

The deepest of ocean waters are classified as:

Accepted Answer

A)  Bathypelagic.
B)  Hadal pelagic.
C)  Abyssopelagic.
D)  Mesopelagic.
E)  Lower epipelagic.F) A) and B)
G) C) and D)

Question 2

A chambered nautilus is a species of.

Accepted Answer

A)  Cnidarian.
B)  Bathyopelagic fish.
C)  Deep ocean isopod.
D)  Cephalopod.E) B) and C)
F) A) and B)

Question 3

An unknown fish has been brought to you to examine.This fish is black,relatively small with small eyes and weak,flabby muscles.This fish is most likely from the:

Accepted Answer

A)  Mesopelagic (vertical migratory) .
B)  Mesopelagic (vertical non-migrator) .
C)  Epipelagic.
D)  Deep pelagic.
E)  Deep-sea benthic.F) A) and D)
G) All of the above D

Question 4

The presence of bioluminescent organs on the underside of mid-water fishes is involved in:

Accepted Answer

A)  Counter shading.
B)  Enlargement of silhouette.
C)  Creating a transparency effect.
D)  Cryptic coloration.
E)  Counter illumination.F) B) and C)
G) All of the above

Question 5

The deep-sea scavengers include animals that feed on:

Accepted Answer

A)  Deep-sea plankton.
B)  Bottom meiofauna.
C)  Particulate organic matter.
D)  Dead animals.
E)  Bacteria.F) B) and C)
G) C) and E)

Question 6

Recent discoveries have shown the Challanger Expedition and other 19th-century oceanographic expeditions assumption that the deep ocean had no ______________ was incorrect.

Accepted Answer

A)  Sediments
B)  volcanic activity
C)  water movement
D)  biodiversityE) B) and D)
F) All of the above

Question 7

The mesopelagic zone extends from about 200 m to about:

Accepted Answer

A)  300 m.
B)  500 m.
C)  1,000 m.
D)  2,000 m.
E)  4,000 m.F) B) and E)
G) A) and E)

Question 8

An important feeding adaptation among deep-sea fishes:

Accepted Answer

A)  Migration to shallower water to feed.
B)  Feeding on males,hence the term "male parasitism".
C)  Ability to eat prey bigger than themselves.
D)  Strong muscles that allow them to move fast to catch any available prey.
E)  Absence of a stomach.F) A) and E)
G) C) and D)

Question 9

Which of the following is least likely to be seen in a vertical non-migrating mesopelagic fish?

Accepted Answer

A)  Weak bones
B)  Swim bladder
C)  Flabby muscles
D)  Small size
E)  Large eyesF) A) and C)
G) B) and C)

Question 10

Bacteria thriving around deep-sea hydrothermal vents are:

Accepted Answer

A)  Photosynthethic.
B)  Symbiotic.
C)  Heterotrophic.
D)  Parasitic.
E)  Chemosynthetic.F) A) and B)
G) A) and E)

Question 11

The most numerous organisms on the deep sea floor are:

Accepted Answer

A)  Macrofauna.
B)  Epifauna.
C)  Endofauna.
D)  Meiofauna.
E)  Infauna.F) A) and D)
G) B) and D)

Question 12

The main oceanic thermocline is located:

Accepted Answer

A)  In the mesopelagic.
B)  Above the mesopelagic.
C)  Below the mesopelagic.
D)  It varies since the thermocline disappears in the tropics.
E)  It varies since the thermocline moves up and down in the water column depending on the amount of oxygen.F) C) and D)
G) B) and E)

Question 13

Bioluminescence in mesopelagic organisms is produced by:

Accepted Answer

A)  Photophores.
B)  Specialized cells.
C)  Secretions of lucifern.
D)  All answers are correct.
E)  Photophores and Specialized cells only.F) A) and D)
G) A) and B)

Question 14

The giant deep-sea hydrothermal vent tubeworm feeds on:

Accepted Answer

A)  Phytoplankton that utilize the heat for primary production.
B)  Detritus from vent deposits.
C)  Small bottom animals such as brittle stars.
D)  Deep-sea bottom fishes that cluster around the vents.
E)  It filter-feeds on chemosynthetic bacteria.F) C) and D)
G) A) and B)

Question 15

The condition that creates the largest problem for animals in the deep sea:

Accepted Answer

A)  Salinity changes.
B)  Temperature changes.
C)  Pressure changes.
D)  Food availability.E) C) and D)
F) None of the above

Question 16

The water below the oxygen minimum layer has:

Accepted Answer

A)  No oxygen at all.
B)  Only very small traces of oxygen.
C)  Some of the oxygen it had when it left the surface.
D)  Most of the oxygen it had when it left the surface.E) A) and B)
F) None of the above D

Question 17

The zone immediately below the bathyalpelegic zone is called the:

Accepted Answer

A)  Abyssopelagic.
B)  Hadal pelagic.
C)  Subtidal.
D)  Subbathyal.
E)  Mesopelagic.F) All of the above
G) A) and D) A

Question 18

The mesopelagic zone refers to the ocean depths in which there is:

Accepted Answer

A)  Enough light to support plant growth.
B)  No light at all.
C)  Dim light,but not enough for plant growth.
D)  Enough light for primary production by bacteria.
E)  Dim light,but enough to support only some hardy plants.F) B) and C)
G) None of the above

Question 19

The energy source for the bacteria that thrive around deep-sea hydrothermal vents is:

Accepted Answer

A)  Hydrogen sulfide.
B)  Light.
C)  Heat from the hydrothermal vents.
D)  Detritus.
E)  Tube-worm tissues.F) A) and B)
G) A) and C)

Question 20

In addition to food,deep-water animals depend on the surface for:

Accepted Answer

A)  Light.
B)  Carbon dioxide.
C)  Chlorophyll.
D)  Oxygen.
E)  All answers are correct.F) A) and B)
G) All of the above

Exam 16: The Ocean Depths

The deepest of ocean waters are classified as:

Correct AnswerverifiedShow Answer

A chambered nautilus is a species of.

Correct AnswerverifiedShow Answer

An unknown fish has been brought to you to examine.This fish is black,relatively small with small eyes and weak,flabby muscles.This fish is most likely from the:

Correct AnswerverifiedD

The presence of bioluminescent organs on the underside of mid-water fishes is involved in:

Correct AnswerverifiedShow Answer

The deep-sea scavengers include animals that feed on:

Correct AnswerverifiedShow Answer

Recent discoveries have shown the Challanger Expedition and other 19th-century oceanographic expeditions assumption that the deep ocean had no ______________ was incorrect.

Correct AnswerverifiedShow Answer

The mesopelagic zone extends from about 200 m to about:

Correct AnswerverifiedShow Answer

An important feeding adaptation among deep-sea fishes:

Correct AnswerverifiedShow Answer

Which of the following is least likely to be seen in a vertical non-migrating mesopelagic fish?

Correct AnswerverifiedShow Answer

Bacteria thriving around deep-sea hydrothermal vents are:

Correct AnswerverifiedShow Answer

The most numerous organisms on the deep sea floor are:

Correct AnswerverifiedShow Answer

The main oceanic thermocline is located:

Correct AnswerverifiedShow Answer

Bioluminescence in mesopelagic organisms is produced by:

Correct AnswerverifiedShow Answer

The giant deep-sea hydrothermal vent tubeworm feeds on:

Correct AnswerverifiedShow Answer

The condition that creates the largest problem for animals in the deep sea:

Correct AnswerverifiedShow Answer

The water below the oxygen minimum layer has:

Correct AnswerverifiedD

The zone immediately below the bathyalpelegic zone is called the:

Correct AnswerverifiedA

The mesopelagic zone refers to the ocean depths in which there is:

Correct AnswerverifiedShow Answer

The energy source for the bacteria that thrive around deep-sea hydrothermal vents is:

Correct AnswerverifiedShow Answer

In addition to food,deep-water animals depend on the surface for:

Correct AnswerverifiedShow Answer

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D

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D

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A

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