Question 1

Which of the following have a complete gut, including an anus?

Accepted Answer

A)   Sea anemones
B)   Pogonophora
C)   Vestimentifera
D)   Acorn barnaclesE) B) and D)
F) A) and D)

Question 2

Bivalve mollusks

Accepted Answer

A)   Have a gill that is used only for feeding
B)   Have a gill that is used often for both feeding and respiration
C)   Respire by flapping the gill within the mantle cavity
D)   Cannot use the gill in feedingE) B) and C)
F) All of the above B

Question 3

Benthic sea squirts are most closely related to

Accepted Answer

A)   The sponges
B)   The vertebrates
C)   The arthropods
D)   PlantsE) B) and D)
F) None of the above

Question 4

Echinoderms differ from mollusks in their

Accepted Answer

A)   Dominant radial symmetry
B)   Lack of three tissue layers
C)   Lack of a calcium carbonate skeleton
D)   All of the aboveE) A) and D)
F) A) and C)

Question 5

All arthropods share

Accepted Answer

A)   A calcified internal skeleton
B)   A calcified external skeleton
C)   An external skeleton composed of chitin
D)   A strictly marine habitatE) None of the above
F) A) and B)

Question 6

Brachiopods, bryozoans, and phoronids share the following:

Accepted Answer

A)   They are all colonial
B)   A ctenidium
C)   A radula
D)   A lophophoreE) None of the above
F) All of the above

Question 7

A close relative of the Pogonophora is

Accepted Answer

A)   Flatworms
B)   Nemerteans
C)   Vestimentifera
D)   MollusksE) B) and C)
F) B) and D)

Question 8

Which of the following are not arthropods?

Accepted Answer

A)   Pycnogonids
B)   Brachiopods
C)   Barnacles
D)   CheliceratesE) C) and D)
F) B) and D)

Question 9

What is the advantage of bilateral symmetry in animals?

Accepted Answer

A)   Can sense food equally in all directions
B)   Superior in every way to radial symmetry
C)   Can more efficiently detect signals from one direction while moving
D)   Is always useful to have a rear endE) C) and D)
F) B) and D)

Question 10

The radula

Accepted Answer

A)   Is found in gastropods and chitons
B)   Is found in gastropods and scaphopods
C)   Is not found in chitons and bivalves
D)   Is used only for locomotion in cephalopodsE) B) and D)
F) None of the above

Question 11

Sponges feed by means of

Accepted Answer

A)   Currents formed by amoebocyte cells
B)   Currents generated by muscular contraction
C)   Currents formed by collar cells
D)   External water currents onlyE) C) and D)
F) All of the above C

Question 12

Trilobites belong to

Accepted Answer

A)   The Crustacea
B)   The Mollusca
C)   The Annelida
D)   The ArthropodaE) None of the above
F) A) and C)

Question 13

Flatworms have

Accepted Answer

A)   Many representatives that are parasitic
B)   No structure capable of gathering food actively
C)   A complete digestive tract with mouth and anus
D)   Only free-living representativesE) A) and D)
F) None of the above

Question 14

All sponges

Accepted Answer

A)   Reproduce exclusively asexually
B)   Have sexual reproduction
C)   Are diffuse organisms with no morphological organization
D)   Are found only in coral reefsE) B) and D)
F) C) and D) B

Question 15

Members of the Polychaeta

Accepted Answer

A)   Have parapodia
B)   Lack setae
C)   Are segmented, unlike the Oligochaeta
D)   All of the aboveE) C) and D)
F) B) and D)

Question 16

Annelids differ from nematodes in

Accepted Answer

A)   Having a complete digestion system
B)   Being marine only
C)   Having mouthparts
D)   Having segmentsE) A) and B)
F) A) and C)

Question 17

All Cnidaria

Accepted Answer

A)   Have a swimming life stage known as a medusa
B)   Are colonial
C)   Have collar cells
D)   Have nematocystsE) A) and D)
F) All of the above

Question 18

Torsion

Accepted Answer

A)   Is found in mollusks that lack a radula
B)   Is found in only the scaphopods
C)   Is an important feature of gastropods
D)   Refers to the spiral form of the shellE) A) and B)
F) A) and C)

Question 19

In Cambrian times

Accepted Answer

A)   All of the phyla that lived failed to survive to the present
B)   No bilateral groups had arisen as yet
C)   Nearly all of the fossilizable living phyla had appeared by then
D)   None of the aboveE) None of the above
F) C) and D)

Question 20

All sponges have

Accepted Answer

A)   Spicules
B)   Bilateral symmetry
C)   Nematocysts
D)   No chemical defensesE) A) and B)
F) A) and C)

Exam 14: The Diversity of Benthic Marine Invertebrates

Which of the following have a complete gut, including an anus?

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Bivalve mollusks

Correct AnswerverifiedB

Benthic sea squirts are most closely related to

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Echinoderms differ from mollusks in their

Correct AnswerverifiedShow Answer

All arthropods share

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Brachiopods, bryozoans, and phoronids share the following:

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A close relative of the Pogonophora is

Correct AnswerverifiedShow Answer

Which of the following are not arthropods?

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What is the advantage of bilateral symmetry in animals?

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The radula

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Sponges feed by means of

Correct AnswerverifiedC

Trilobites belong to

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Flatworms have

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All sponges

Correct AnswerverifiedB

Members of the Polychaeta

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Annelids differ from nematodes in

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All Cnidaria

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Torsion

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In Cambrian times

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All sponges have

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B

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C

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B

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