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1 | |
The structure of molluscs that forms the shell and houses the gills is the
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| | A) | mantle.
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| | B) | epidermis.
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| | C) | gastrovascular cavity.
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| | D) | odontophore.
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2 | |
The structure that is used for feeding in most molluscs is the
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| | A) | buccal cavity.
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| | B) | radula.
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| | C) | mouth.
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| | D) | odontophore.
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3 | |
The portion of the radula that supports the teeth and is cartilaginous is called the
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| | A) | spicules.
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| | B) | visceral mass.
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| | C) | teeth.
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| | D) | odontophore.
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4 | |
A molluscan shell is made of three layers arranged from the outside to the inside:
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| | A) | mantle layer, prismatic layer, periostracum.
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| | B) | prismatic layer, periostracum, nacreous layer.
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| | C) | periostracum, prismatic layer, nacreous layer.
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| | D) | nacreous layer, periostracum, mantle layer.
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5 | |
The first larval stage that is typical of molluscans is the
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| | A) | planula.
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| | B) | veliger.
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| | C) | actinotroph.
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| | D) | trochophore.
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6 | |
The trochophore larva indicates a common ancestry for which of the following pairs?
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| | A) | Mollusca-Annelida
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| | B) | Mollusca-Cnidaria
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| | C) | Mollusca-Cephalopoda
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| | D) | Mollusca-Nematoda
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7 | |
The characters of no shell, integumental scales, a reduced head and being dioecious describes which of the following molluscs?
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| | A) | Caudofoveata
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| | B) | Solenogastres
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| | C) | Monoplacophora
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| | D) | Polyplacophora
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8 | |
Which of the following classes of molluscs is thought to be the most primitive or closest to the ancestral form?
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| | A) | Caudofoveata
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| | B) | Solenogastres
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| | C) | Monoplacophora
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| | D) | Polyplacophora
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9 | |
Gastropoda taxonomy is currently under consideration. The traditional three subclasses are Prosobranchia, and two others;
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| | A) | Nudibranchia, Pelycopoda.
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| | B) | Pelycopoda, Opisthobranchia.
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| | C) | Opisthobranchia, Pulmonata.
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| | D) | Pulmonata, Nudibranchia.
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10 | |
The monoplacophorans were known only from the fossil record until 1952 when ________ emerged from a deep-sea trawl net. |
| | A) | specimens of Neopilina |
| | B) | specimens of Pedicularia |
| | C) | specimens of Mopalia |
| | D) | specimens of Loligo |
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11 | |
Which of the following structures do bivalves use in the process of digestion?
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| | A) | a crystalline style
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| | B) | a jaw
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| | C) | peristaltic muscles
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| | D) | byssal threads
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12 | |
Torsion is a process that rotates the _________ of the body of gastropods.
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| | A) | surface
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| | B) | mantle
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| | C) | viscera
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| | D) | tentacles
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13 | |
In freshwater clams, the veliger larva develops into a specialized ectoparasitic form called a
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| | A) | trochophore.
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| | B) | glochidia.
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| | C) | spat.
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| | D) | planula.
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14 | |
The adaptation of bivalves to a sedentary, filter-feeding lifestyle that exploits the sand of a beach as a habitat, has lead to the loss of the ________ and the radula.
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| | A) | foot
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| | B) | mantle
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| | C) | head
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| | D) | visceral mass
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15 | |
The oldest part of the shell of a bivalve is called the ______ and it is located on the _______ of the shell.
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| | A) | umbo, left side
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| | B) | umbo, dorsal side
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| | C) | periostracum, right side
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| | D) | periostracum, ventral side
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16 | |
In molluscs, the shell is secreted by the
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| | A) | mantle.
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| | B) | gills.
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| | C) | ctenidia.
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| | D) | odontophore.
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17 | |
The type of excretory organs possessed by molluscs is
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| | A) | pronephridia.
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| | B) | metanephridia.
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| | C) | mesonephridia.
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| | D) | telonephridia.
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18 | |
An ancestral character for molluscs is the
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| | A) | veliger larva.
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| | B) | trochophore larva.
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| | C) | planula larva.
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| | D) | naiad larva.
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19 | |
Interestingly, chitons have a radula reinforced with
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| | A) | magnetite.
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| | B) | iodine.
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| | C) | chromium.
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| | D) | magnesium.
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20 | |
The kidneys of a molluscan both excrete waste and removes excess water. This type is a known as a metanephridia.
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| | A) | True
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| | B) | False
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21 | |
The caudofoveates and the solenogasters were previously combined into one class called Pelycopoda.
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| | A) | True
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| | B) | False
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22 | |
The characters of no shell, integumental scales, a reduced head and being monoecious describes the Solenogastres.
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| | A) | True
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| | B) | False
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23 | |
The chitons are able to respire even while firmly attached to a rock because the gills in the mantle groove are aerated continuously by the gills moving back and forth.
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| | A) | True
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| | B) | False
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24 | |
A mollusc that has its mantle wrapped around the viscera and a shell that is a tube is in the class Scaphopoda.
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| | A) | True
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| | B) | False
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25 | |
While many molluscs feed using a radula to scrape algae from rocks or drill shells, the tusk shells obtain their food by using cilia.
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| | A) | True
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| | B) | False
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26 | |
A mollusc that is a univalve with one opening to the shell or does not have a shell and shows torsion to some extent is in class Gastropoda.
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| | A) | True
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| | B) | False
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27 | |
Polyplacophora is the class containing by an animals characterized by possessing eight dorsal valves in its shell.
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| | A) | True
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| | B) | False
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28 | |
The chemical sensory organs found in the chiton are called rhopalia.
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| | A) | True
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| | B) | False
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29 | |
Some gastropods have a horny plate that covers the shell aperture; this structure is called an osphradium.
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| | A) | True
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| | B) | False
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30 | |
A mollusc that has a shell of two valves and is usually a filter feeder is a scaphopod.
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| | A) | True
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| | B) | False
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31 | |
A mollusc that is an active predator, has tentacles, and is marine could only be classified in the class Cephalopoda.
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| | A) | True
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| | B) | False
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32 | |
A cephalopod that has an external shell and is extinct would be an ammonoid.
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| | A) | True
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| | B) | False
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33 | |
The jet propulsion method of swimming that is seen in squid is accomplished by forcing water from the mantle cavity through a ventral incurrent siphon.
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| | A) | True
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| | B) | False
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34 | |
The cephalopods are known for the ability to rapidly change colors. The ability is related to pigment cells known as chromatophores.
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| | A) | True
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| | B) | False
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35 | |
Unlike the other classes of the molluscs, which have a heart and a hemocoel, the members of class Cephalopoda have a closed circulatory system.
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| | A) | True
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| | B) | False
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36 | |
Most of the molluscs are monoecious but some of the gastropods are hermaphroditic.
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| | A) | True
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| | B) | False
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37 | |
Molluscs exhibit many life styles, however none are terrestrial filter feeders.
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| | A) | True
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| | B) | False
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38 | |
In molluscan terminology, another term for the mantle is pallium, and another term for gills is ctenidia.
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| | A) | True
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| | B) | False
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39 | |
The foot of molluscs is extended by hydraulic means, by engorgement with blood.
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| | A) | True
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| | B) | False
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