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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 |
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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. |
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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. |
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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. |
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5 | |
The molluscs are most closely related to the |
| | A) | annelids. |
| | B) | echinoderms. |
| | C) | arthropods. |
| | D) | chordates. |
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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. |
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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. |
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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. |
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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 |
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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 |
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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 |
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12 | |
A/an ______ 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 |
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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 |
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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 |
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15 | |
A ______ is a developmental stage of a freshwater bivalve that is parasitic on fishes. |
| | A) | veliger |
| | B) | trochophore |
| | C) | planula |
| | D) | glochidium |
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16 | |
Members of the classes Cephalopoda and Scaphopoda are the only molluscs that possess closed circulatory systems. |
| | A) | True |
| | B) | False |
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17 | |
The zebra mussel was introduced into the Great Lakes by aquarium owners who bought the bivalves in pet stores. |
| | A) | True |
| | B) | False |
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18 | |
Cephalopods rely on olfactory senses for detecting prey. |
| | A) | True |
| | B) | False |
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19 | |
Members of the class Polyplacophora include the chitons, which are found on hard substrates in marine habitats. |
| | A) | True |
| | B) | False |
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20 | |
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 |
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21 | |
Labial palps of bivalves sort filtered food particles delivered by cilia lining the ventral margin of the gills. |
| | A) | True |
| | B) | False |
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22 | |
The operculum aids in both respiration and reproduction in gastropods. |
| | A) | True |
| | B) | False |
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23 | |
The Gastropoda and the Cephalopoda form a clade characterized by a dorsoventrally elongate body and shell coiling. |
| | A) | True |
| | B) | False |
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24 | |
The diversity of body forms and lifestyles present in the phylum Mollusca is an excellent example of adaptive radiation. |
| | A) | True |
| | B) | False |
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25 | |
The absence of a shell in the Caudofoveata and Aplacophora is a primitive character in the phylum Mollusca. |
| | A) | True |
| | B) | False |
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2002 McGraw-Hill Higher Education