Question 1

Acorn worms belong to the class

Accepted Answer

A)  Ascidacea.
B)  Concentricycloidea.
C)  Pterobranchia.
D)  Enteropneusta.
E)  Thaliacea.F) B) and E)
G) D) and E)

Question 2

Echinoderms from this class have been over harvested around the Galàpagos islands,as they have become increasingly popular for both culinary and medicinal uses.

Accepted Answer

A)  Holothuroidea
B)  Asteroidea
C)  Ophiuroidea
D)  Echinoidea
E)  CrinoideaF) A) and C)
G) D) and E)

Question 3

The echinoderms and hemichordates are

Accepted Answer

A)  asymmetrical.
B)  diploblastic.
C)  deuterostomes.
D)  ecdysozoans.
E)  lophotrochozoans.F) D) and E)
G) C) and D)

Question 4

In sea stars,thin folds of the body wall that function in respiration are called

Accepted Answer

A)  filamentous gills.
B)  ctenidia.
C)  Polian vesicles.
D)  book gills.
E)  dermal branchiae.F) B) and D)
G) C) and E)

Question 5

In sea stars,the __________ surface is the upper surface of the animal and contains the madreporite.

Accepted Answer

A)  aboral
B)  oral
C)  madreporite
D)  anal
E)  rigidF) A) and E)
G) A) and C)

Question 6

Which of the following echinoderms may contain venom dangerous to humans?

Accepted Answer

A)  sea stars
B)  sea lilies
C)  feather stars
D)  brittle stars
E)  sea urchinsF) B) and E)
G) D) and E)

Question 7

When feeding on a bivalve,a sea star everts the _______ from its body.

Accepted Answer

A)  gizzard
B)  crop
C)  oral (cardiac)  stomach
D)  pylorus
E)  rectal cecumF) A) and D)
G) A) and E)

Question 8

Nutritionally,pterobranchs are

Accepted Answer

A)  filter feeders.
B)  parasitic.
C)  mutualistic.
D)  commensalists
E)  predators.F) A) and E)
G) A) and D)

Question 9

The function of Aristotle's lantern is

Accepted Answer

A)  protection.
B)  digestion.
C)  chewing.
D)  locomotion.
E)  regeneration.F) A) and B)
G) A) and C)

Question 10

Enteropneusta are wormlike as adults and pterobranchia live attached to the substrate.Which of the following are similarities that warrant their inclusion in the common phylum Hemichordata? Check all that apply.

Accepted Answer

A)   Ciliated pharyngeal slits
B)   Tripartite coelom
C)   Dorsal nervous system
D)   Similar feeding habitsE) A) and B)
F) B) and C)

Question 11

Enteropneusta and Pterobranchia are classes of animals within the phylum Hemichordata.Which of the following characters could be used to distinguish between members of these two classes?

Accepted Answer

A)  Filter feeding vs.deposit feeding
B)  Open vs.closed circulatory system
C)  Presence or absence of pharyngeal slits
D)  Dorsal vs.ventral nervous systemE) B) and C)
F) None of the above

Question 12

The primary circulatory medium in echinoids is

Accepted Answer

A)  blood.
B)  hemal fluid.
C)  plasma.
D)  coelomic fluid.
E)  pyloric cecae.F) All of the above
G) A) and D)

Question 13

The circulatory system of enteropneusts sends blood anteriorly into a series of sinuses called the __________,that may filter excretory wastes.

Accepted Answer

A)  nephridium
B)  flame bulb
C)  renette
D)  glomerulus
E)  renal corpuscleF) All of the above
G) None of the above

Question 14

Sea lilies and feather stars belong to the echinoderm class

Accepted Answer

A)  Holothuroidea.
B)  Asteroidea.
C)  Ophiuroidea.
D)  Concentricycloidea.
E)  Crinoidea.F) A) and B)
G) A) and C)

Question 15

The major secretory and absorptive structures of the sea star digestive system are the

Accepted Answer

A)  cardiac stomachs.
B)  rectal ceca.
C)  Polian vesicles.
D)  pyloric ceca.
E)  Tiedemann's bodies.F) B) and E)
G) B) and D)

Question 16

Which is the only class of echinoderms where the oral surface is not oriented to the substrate?

Accepted Answer

A)  Asteroidea.
B)  Ophiuroidea.
C)  Holothuroidea
D)  Crinoidea.
E)  Echinoidea.F) C) and D)
G) A) and D)

Question 17

Exchange of respiratory gases in enteropneusts is accomplished at the pharyngeal slits and by

Accepted Answer

A)  diffusion in alveolar lungs.
B)  active transport in the tracheal system.
C)  diffusion across the body wall.
D)  facilitated diffusion in dermal branchiae.
E)  facilitated diffusion in book gills.F) All of the above
G) None of the above

Question 18

The anterior region of the digestive tract of enteropneusts contains the gill slits.This region is called the

Accepted Answer

A)  pharynx.
B)  esophagus.
C)  buccal cavity.
D)  atrium.
E)  stomach.F) C) and D)
G) B) and E)

Question 19

As deuterostomes,the echinoderms and hemichordates share all of the following developmental characteristics except one.

Accepted Answer

A)  The anus develops from the blastopore.
B)  The coelom forms from outpockets of the embryonic gut tract.
C)  The cleavage is radial.
D)  The cleavage is determinate.
E)  The larval forms are bilaterally symmetrical and ciliated.F) All of the above
G) A) and B)

Question 20

Sea urchins and sand dollars belong to the echinoderm class

Accepted Answer

A)  Crinoidea.
B)  Asteroidea.
C)  Ophiuroidea.
D)  Holothuroidea.
E)  Echinoidea.F) B) and C)
G) B) and E)

Exam 16: Ambulacraria: Echinoderms and Hemichordates

Nutritionally,pterobranchs are

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The circulatory system of enteropneusts sends blood anteriorly into a series of sinuses called the __________,that may filter excretory wastes.

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The function of Aristotle's lantern is

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Enteropneusta and Pterobranchia are classes of animals within the phylum Hemichordata.Which of the following characters could be used to distinguish between members of these two classes?

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Exchange of respiratory gases in enteropneusts is accomplished at the pharyngeal slits and by

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The echinoderms and hemichordates are

Correct AnswerverifiedShow Answer

As deuterostomes,the echinoderms and hemichordates share all of the following developmental characteristics except one.

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Acorn worms belong to the class

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Sea lilies and feather stars belong to the echinoderm class

Correct AnswerverifiedShow Answer

Which is the only class of echinoderms where the oral surface is not oriented to the substrate?

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The anterior region of the digestive tract of enteropneusts contains the gill slits.This region is called the

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In sea stars,thin folds of the body wall that function in respiration are called

Correct AnswerverifiedShow Answer

Echinoderms from this class have been over harvested around the Galàpagos islands,as they have become increasingly popular for both culinary and medicinal uses.

Correct AnswerverifiedShow Answer

Enteropneusta are wormlike as adults and pterobranchia live attached to the substrate.Which of the following are similarities that warrant their inclusion in the common phylum Hemichordata? Check all that apply.

Correct AnswerverifiedShow Answer

Sea urchins and sand dollars belong to the echinoderm class

Correct AnswerverifiedShow Answer

The major secretory and absorptive structures of the sea star digestive system are the

Correct AnswerverifiedShow Answer

The primary circulatory medium in echinoids is

Correct AnswerverifiedShow Answer

In sea stars,the __________ surface is the upper surface of the animal and contains the madreporite.

Correct AnswerverifiedShow Answer

When feeding on a bivalve,a sea star everts the _______ from its body.

Correct AnswerverifiedShow Answer

Which of the following echinoderms may contain venom dangerous to humans?

Correct AnswerverifiedShow Answer

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