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1All of the following are unique to the molluscs except one. Select the exception.
A)mantle
B)shell
C)visceral mass
D)head-foot


2Which 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.


3The mantle of most molluscs
A)is modified for locomotion.
B)is used in attracting prey.
C)secretes the shell.
D)supports the radula.


4Which 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.


5The molluscs are most closely related to the
A)other lophotrochozoans
B)echinoderms.
C)other edysozoans.
D)chordates.


6Which 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.


7Molluscs can be characterized by:
A)trochophore larvae, and they are deuterostomes.
B)planala larvae, and they are ecdysozoans.
C)trochophore larvae and they are lophotrochozoans.
D)planula larvae, and they are deuterostomes.


8All 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


9Members 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


10Members 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


12A ______ 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


13Members 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.


14Water 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


15A ______ is a developmental stage of a freshwater bivalve that is parasitic on fishes.
A)veliger
B)trochophore
C)planula
D)glochidium


16Members of the classes Cephalopoda and Scaphopoda are the only molluscs that possess closed circulatory systems.
A)True
B)False


17Cephalopods rely on olfactory senses for detecting prey.
A)True
B)False


18Members of the class Polyplacophora include the chitons, which are found on hard substrates in marine habitats.
A)True
B)False


19Members 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


20Labial palps of bivalves sort filtered food particles delivered by cilia lining the ventral margin of the gills.
A)True
B)False


21The operculum aids in both respiration and reproduction in gastropods.
A)True
B)False


22The Gastropoda and the Cephalopoda form a clade characterized by a dorsoventrally elongate body and shell coiling.
A)True
B)False


23The diversity of body forms and lifestyles present in the phylum Mollusca is an excellent example of adaptive radiation.
A)True
B)False


24The absence of a shell in the Aplacophora is a primitive character in the phylum Mollusca.
A)True
B)False





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