Deck 11: Molluscan Success

Question 1

The class of molluscs that contains the most species is the class

A)Aplacophora
B)Cephalopoda
C)Gastropoda
D)Polyplacophora
E)Pelecypoda

Answer 1

C

Question 2

Molluscs are

A)deuterostomes.
B)ecdysozoaons.
C)lophotrochozoans.
D)chordates.
E)hemichordates.

Answer 2

C

Question 3

The gastropod larval stage in which torsion occurs is called the

A)dipleurula.
B)pilidium.
C)Muller's larva.
D)veliger.

Answer 3

D

Question 4

In gastropods,food is trapped in mucus and incorporated into a rotating mucoid mass called the __________,which extends to the stomach.

A)stylet
B)siphonoglyph
C)protostyle
D)odontophore
E)osphradium

Question 5

The primary excretory product of aquatic gastropods is

A)urine.
B)urea.
C)ammonia.
D)uric acid.
E)guanine.

Question 6

The adaptation of bivalves to sedentary,filter feeding life-styles involved loss of the __________ and the radula.

A)mantle
B)foot
C)head
D)visceral mass
E)siphons

Question 7

In some gastropods,a(n)__________ is found on the dorsal,posterior margin of the foot and when the foot is drawn into the shell,seals the opening.

A)radula
B)operculum
C)tentacles
D)siphons
E)osphradium

Question 8

Which of the following is not a member of the class Bivalvia?

A)clams
B)mussels
C)oysters
D)chitons
E)scallops

Question 9

The body of molluscs is divided into two main regions called the

A)head-foot and visceral mass.
B)mantle and foot.
C)head-foot and enterocoel.
D)visceral mass and mantle.
E)head and foot.

Question 10

The 180 ^$\circ$ ,counterclockwise twisting of the visceral mass,mantle,and mantle cavity of gastropods is called

A)contortion.
B)torsion.
C)helixing.
D)coiling.
E)operculating.

Question 11

The circulatory system of most molluscs is

A)hydraulic.
B)incurrent.
C)closed.
D)excurrent.
E)open.

Question 12

Among molluscs,extension of body structures such as tentacles is accomplished by

A)a hydraulic skeleton.
B)special extensor muscles.
C)tendons and ligaments.
D)a system of levers.
E)muscles and levers.

Question 13

Muscles responsible for closing the bivalve shell are

A)longitudinal.
B)adductors.
C)retractors.
D)circular.
E)protractors.

Question 14

Snails,slugs,and limpets belong to the molluscan class

A)Gastropoda.
B)Pelecypoda.
C)Polyplacophora.
D)Aplacophora.
E)Cephalopoda.

Question 15

The oldest part of the bivalve shell is the

A)umbo.
B)periostracum.
C)hinge ligament.
D)left valve.
E)right valve.

Question 16

The space between the mantle and foot in a mollusc is called the

A)hemocoel.
B)coelom.
C)enterocoel.
D)mantle cavity.
E)radular cavity.

Question 17

The shell of a mollusc is secreted by the

A)radula.
B)mantle.
C)periostracum.
D)foot.
E)visceral mass.

Question 18

There are roughly ___________ described species in the phylum Mollusca.

A)1,000
B)10,000
C)100,000
D)1 million
E)10 million

Question 19

The inner layer of the mollusc shell is the __________ layer.

A)radular
B)prismatic
C)nacreous
D)helix
E)periostracum

Question 20

The rasping structure occurring in the mouth of most molluscs is the

A)tongue.
B)nacre.
C)odontophore.
D)operculum.
E)radula.

Question 21

Tooth shells belong to the molluscan class

A)Bivalvia.
B)Cephalopoda.
C)Polyplacophora.
D)Gastropoda.
E)Scaphopoda.

Question 22

Chitons belong to the molluscan class

A)Monoplacophora.
B)Scaphopoda.
C)Polyplacophora.
D)Cephalopoda.
E)Bivalvia.

Question 23

The diversity of body forms and life-styles in the phylum Mollusca is an excellent example of

A)adaptive radiation.
B)convergent evolution.
C)emergent evolution.
D)parallel evolution.
E)homologous evolution.

Question 24

The shell-secreting organ of bivalve mollusks is the

A)umbo.
B)visceral mass.
C)foot.
D)mantle.
E)crystalline style.

Question 25

The only living cephalopods that possess an external shell are the

A)scallops.
B)cuttlefishes.
C)toothshells.
D)nautiloids
E)squids.

Question 26

The similarity of design between the eyes of vertebrates and the eyes of many cephalopods provides an excellent example of

A)divergent evolution.
B)convergent evolution.
C)perpendicular phylogeny.
D)adaptive radiation.
E)cladistic phylogeny.

Question 27

Neopilina represents the molluscan class __________,that was known only from fossils until 1952.

A)Monoplacophora
B)Aplacophora
C)Polyplacophora
D)Bivalvia
E)Gastropoda

Question 28

Sperm packets of cephalopods are called

A)cecae.
B)stylets.
C)cocoons.
D)spermatophores.
E)gonophores.

Question 29

Solenogasters are cylindrical molluscs that lack a shell; they are carnivores and

A)monoecious.
B)herbivores.
C)dioecious.
D)reproduce asexually.

Question 30

In the bivalves,final digestion occurs

A)in the adductor muscles.
B)in the coelom.
C)in the labial palps.
D)in the crystaline style.
E)in the digestive gland.

Question 31

In the bivalves,gas exchange takes place through the

A)mantle cavity.
B)siphons.
C)visceral mass.
D)gills.
E)foot.

Question 32

Unlike other molluscs,the __________ have a closed circulatory system.

A)univalves
B)gastropods
C)chitons
D)bivalves
E)cephalopods

Question 33

The modified veliger of some freshwater bivalves is called the

A)glochidium.
B)trochophore.
C)pilidium.
D)dipleura.
E)cercoid.

Question 34

The most complex molluscs belong to the class

A)Gastropoda.
B)Bivalvia.
C)Cephalopoda.
D)Polyplacophora.
E)Scaphopoda.

Question 35

Cephalopods typically locate prey by

A)sight.
B)tactile senses.
C)olfaction.
D)gustation.
E)echolocation.

Question 36

Pigment cells of cephalopods are called

A)pinacocytes.
B)odontophores.
C)chromatophores.
D)erythrocytes.
E)nautilophores.

Question 37

The tentacle of male cephalopods that is modified for spermatophore transfer is the

A)hectocotylus.
B)umbo.
C)pneumostome.
D)operculum.
E)odontophore.

Question 38

Squids,octopuses,cuttlefishes,and nautili belong to the molluscan class

A)Gastropoda.
B)Cephalopoda.
C)Polyplacophora.
D)Bivalvia.
E)Pelecypoda.