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Multiple Choice Quiz
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1

All of the following are unique to the molluscs except one. Select the exception.
A)mantle
B)shell
C)visceral mass
D)head-foot
2

Which of the following is true of the radula of most molluscs?
A)It is used in reproduction.
B)It is used in excretion.
C)It is used in rasping food.
D)It is used in gas exchange.
3

The mantle of most molluscs
A)is modified for locomotion.
B)is used in attracting prey.
C)secretes the shell.
D)supports the radula.
4

Which of the following is true of the mantle cavity of a bivalve?
A)It is the area where water circulates during feeding and gas exchange.
B)It is the space between the mantle and the shell.
C)It is the space between the pericardium and the heart.
D)It is the space where blood circulates before being returned to the heart.
5

The molluscs are most closely related to the
A)annelids.
B)echinoderms.
C)arthropods.
D)chordates.
6

Which of the following is true of the visceral mass of a mollusc?
A)It contains the gills.
B)It secretes the shell.
C)It is used in locomotion.
D)It contains gonads and digestive glands.
7

Molluscs can be characterized by:
A)trochophore larvae, and they are deuterostomes.
B)planaria larvae, and they are protostomes.
C)trochophore larvae and they are protostomes.
D)planaria larvae, and they are deuterostomes.
8

All of the following mollusc characters would be found in a member of the class Bivalvia except one. Select the exception.
A)visceral mass
B)head-foot
C)mantle cavity
D)radula
9

Members of which of the following mollusc classes would be characterized by a shell consisting of 8 plates?
A)Aplacophora
B)Polyplacophora
C)Monoplacophora
D)Cephalopoda
10

Members of which of the following mollusc classes would be characterized by a reduced head, a mantle that surrounds the entire body and a tusk-shaped shell?
A)Scaphopoda
B)Bivalvia
C)Polyplacophora
D)Gastropoda
11

______ is a developmental process that occurs in gastropods and results in a 180 degree counterclockwise twisting of the visceral mass and mantle cavity.
A)Gastrulation
B)Epiboly
C)Involution
D)Torsion
12

A ______ is a mucoid mass that extends to the stomach of gastropods. It contains trapped food particles and is rotated by cilia.
A)protostyle
B)umbo
C)crystalline style
D)gastric shield
13

Members of the gastropod subclass Pulmonata are predominantly freshwater or terrestrial. Their mantle is modified into a lung, which opens to the outside of the mantle cavity through a/an
A)siphon.
B)pneumostome.
C)umbo.
D)operculum.
14

Water exits the mantle cavity of a bivalve through the ______ and the excurrent opening.
A)water tube
B)incurrent opening
C)suprabranchial chamber
D)pericardial cavity
15

A ______ is a developmental stage of a freshwater bivalve that is parasitic on fishes.
A)veliger
B)trochophore
C)planula
D)glochidium
16

Members of the classes Cephalopoda and Scaphopoda are the only molluscs that possess closed circulatory systems.
A)True
B)False
17

Cephalopods rely on olfactory senses for detecting prey.
A)True
B)False
18

Members of the class Polyplacophora include the chitons, which are found on hard substrates in marine habitats.
A)True
B)False
19

Members of the class Monoplacophora are wormlike molluscs that lack a shell, crystalline style, and foot; they live in vertical burrows on the deep-sea floor.
A)True
B)False
20

Labial palps of bivalves sort filtered food particles delivered by cilia lining the ventral margin of the gills.
A)True
B)False
21

The operculum aids in both respiration and reproduction in gastropods.
A)True
B)False
22

The Gastropoda and the Cephalopoda form a clade characterized by a dorsoventrally elongate body and shell coiling.
A)True
B)False
23

The diversity of body forms and lifestyles present in the phylum Mollusca is an excellent example of adaptive radiation.
A)True
B)False
24

The absence of a shell in the Aplacophora is a primitive character in the phylum Mollusca.
A)True
B)False





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