Question 1

Chitons belong to the molluscan class

Accepted Answer

A)  Monoplacophora.
B)  Scaphopoda.
C)  Polyplacophora.
D)  Cephalopoda.
E)  Bivalvia.F) C) and E)
G) None of the above C

Question 2

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

Accepted Answer

A)  Aplacophora
B)  Cephalopoda
C)  Gastropoda
D)  Polyplacophora
E)  PelecypodaF) All of the above
G) A) and B)

Question 3

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

Accepted Answer

A)  Monoplacophora
B)  Aplacophora
C)  Polyplacophora
D)  Bivalvia
E)  GastropodaF) A) and E)
G) B) and E)

Question 4

In the bivalves,gas exchange takes place through the

Accepted Answer

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

Question 5

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

Accepted Answer

A)  mantle
B)  foot
C)  head
D)  visceral mass
E)  siphonsF) C) and E)
G) C) and D)

Question 6

Molluscs are

Accepted Answer

A)  deuterostomes.
B)  ecdysozoaons.
C)  lophotrochozoans.
D)  chordates.
E)  hemichordates.F) B) and E)
G) All of the above

Question 7

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

Accepted Answer

A)  monoecious.
B)  herbivores.
C)  dioecious.
D)  reproduce asexually.E) B) and D)
F) C) and D)

Question 8

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

Accepted Answer

A)  hectocotylus.
B)  umbo.
C)  pneumostome.
D)  operculum.
E)  odontophore.F) D) and E)
G) All of the above

Question 9

Tooth shells belong to the molluscan class

Accepted Answer

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

Question 10

Pigment cells of cephalopods are called

Accepted Answer

A)  pinacocytes.
B)  odontophores.
C)  chromatophores.
D)  erythrocytes.
E)  nautilophores.F) None of the above
G) A) and E)

Question 11

The shell-secreting organ of bivalve mollusks is the

Accepted Answer

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

Question 12

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

Accepted Answer

A)  contortion.
B)  torsion.
C)  helixing.
D)  coiling.
E)  operculating. F) All of the above
G) B) and E)

Question 13

The gastropod larval stage in which torsion occurs is called the

Accepted Answer

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

Question 14

In the bivalves,final digestion occurs

Accepted Answer

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

Question 15

The shell of a mollusc is secreted by the

Accepted Answer

A)  radula.
B)  mantle.
C)  periostracum.
D)  foot.
E)  visceral mass.F) A) and E)
G) None of the above

Question 16

There are roughly ___________ described species in the phylum Mollusca.

Accepted Answer

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

Question 17

The circulatory system of most molluscs is

Accepted Answer

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

Question 18

The most complex molluscs belong to the class

Accepted Answer

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

Question 19

The modified veliger of some freshwater bivalves is called the

Accepted Answer

A)  glochidium.
B)  trochophore.
C)  pilidium.
D)  dipleura.
E)  cercoid.F) B) and C)
G) None of the above

Question 20

Cephalopods typically locate prey by

Accepted Answer

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

Exam 11: Molluscan Success

Chitons belong to the molluscan class

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In the bivalves,gas exchange takes place through the

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

Molluscs are

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Tooth shells belong to the molluscan class

Correct AnswerverifiedShow Answer

Pigment cells of cephalopods are called

Correct AnswerverifiedShow Answer

The shell-secreting organ of bivalve mollusks is the

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

The gastropod larval stage in which torsion occurs is called the

Correct AnswerverifiedShow Answer

In the bivalves,final digestion occurs

Correct AnswerverifiedShow Answer

The shell of a mollusc is secreted by the

Correct AnswerverifiedShow Answer

There are roughly ___________ described species in the phylum Mollusca.

Correct AnswerverifiedShow Answer

The circulatory system of most molluscs is

Correct AnswerverifiedShow Answer

The most complex molluscs belong to the class

Correct AnswerverifiedShow Answer

The modified veliger of some freshwater bivalves is called the

Correct AnswerverifiedShow Answer

Cephalopods typically locate prey by

Correct AnswerverifiedShow Answer

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C

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D

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D

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

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