Question 1

In sea stars,contraction of the __________ force water into the tube feet of the water vascular system.

Accepted Answer

A)  ampullae
B)  lateral canals
C)  Polian vesicles
D)  hemal rings
E)  Tiedemann's bodies

Question 2

Enteropneusta and Pterobranchia are classes of animals within the phylum Hemichordata.All of the following are features relating to reproduction in members of the Hemichordata.Three features listed are either common to members of both classes or occur only in Enteropneusta.Select the one feature that occurs only in Pterobranchia.

Accepted Answer

A)  External fertilization
B)  Ciliated tornaria larval stage
C)  Asexual budding common
D)  Dioecious with gonads in anterior trunk

Question 3

Synchronous spawning by enteropneusts suggests the presence of

Accepted Answer

A)  asexual reproduction.
B)  epitoky.
C)  parthenogenesis.
D)  protandry.
E)  pheromones.

Question 4

The skeleton of sea urchins consists of ten sets of closely fitting plates and is called a(n)

Accepted Answer

A)  test.
B)  exoskeleton.
C)  cuticle.
D)  tunic.
E)  spine.

Question 5

The echinoderms that most closely resemble fossil forms are the

Accepted Answer

A)  crinoids.
B)  ophiuroids.
C)  holothuroids.
D)  asteroids.
E)  echinoids.

Question 6

Sea cucumbers belong to the echinoderm class

Accepted Answer

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

Question 7

If a brittle star is grasped by an arm,certain muscles may contract to serve and cast off the arm in a process called

Accepted Answer

A)  asexual reproduction.
B)  rejection.
C)  autotomy.
D)  regeneration.
E)  escapism.

Question 8

Regeneration of lost parts of a sea star also serves in

Accepted Answer

A)  feeding.
B)  sexual reproduction.
C)  asexual reproduction.
D)  discouraging predators.
E)  removing toxins from the body.

Question 9

Sea daisies were formerly assigned to a class of their own.They have been recently assigned to the echinoderm class

Accepted Answer

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

Question 10

Sea stars typically feed

Accepted Answer

A)  on suspended materials.
B)  on kelp.
C)  on detritus in the sediments.
D)  on bivalves.
E)  on small fishes. D

Question 11

Echinoderms and hemichordates are more closely related to mammals than to crabs and shrimp.Indicate below if this statement is True or False,followed by the correct reasoning for that answer.Check all of the answer choices that apply.

Accepted Answer

A)   True.Echinoderms,hemichordates,and mammals are all deuterostomes.
B)  False.Crabs,shrimp,echinoderms and hemichordates are all invertebrates and chordates are vertebrates.
C)  True.Echinoderms,hemichordates,and mammals all share developmental characteristics including determinant cleavage and a mouth that forms in the region of the blastopore.
D)   True.This relationship is supported by molecular evidence.

Question 12

In Asteroidea the ________ system consists of strands of tissue that encircle the mouth near the ring canal and run into each arm near the radial canals.As in other echinoderms,this system probably transports digestive products,hormones,and other substances.

Accepted Answer

A)  hemal
B)  secretory
C)  skeletal
D)  muscular
E)  excretory

Question 13

The water vascular system of echinoderms carries out many functions that are distributed through multiple systems in other animals.Which of the statements below are valid comparisons between the functions of the water vascular system and similar functions in arthropods? Check all that apply.

Accepted Answer

A)   Gas exchange in echinoderms often occurs via diffusion of gases across tube feet.In arthropods there are tracheal systems or gills that provide for gas exchange.
B)   The water vascular system is often a means of attachment and locomotion via tube feet of echinoderms.In arthropods,muscles interact with the jointed exoskeleton to produce movement.
C)   The water vascular system of echinoderms provides for the release of gametes for external fertilization.Arthropods have oviducts and sperm ducts for the release of gametes to the environment.
D)   The water vascular system has sensory function in virtually all echinoderms.In some echinoderms,it also may be involved with suspension feeding.In arthropods,the exoskeleton is modified for sensory perception and feeding usually involves specialized mouthparts and other modified appendages.

Question 14

In the sea stars,a(n) __________ groove runs along the underside of each arm.

Accepted Answer

A)  madreporite
B)  Polian vesicular
C)  stone canal
D)  tube feet
E)  ambulacral

Question 15

Coiled masses of fecal material called __________ are deposited on the substrate at one of the openings of the burrow of an enteropneust.

Accepted Answer

A)  castings
B)  mucus
C)  detritus
D)  particulate matter
E)  pseudofeces

Question 16

Which of the following is a characteristic of animals in the phylum Hemichordata?

Accepted Answer

A)  closed circulatory system
B)  incomplete digestive tract
C)  ciliated pharyngeal slits
D)  indeterminate cleavage
E)  blastopore develops into the mouth

Question 17

Some sea cucumbers have special tubules of the respiratory tree that contains sticky secretions and toxins and can be everted through the anus; these are called __________ tubules.

Accepted Answer

A)  Tiedemann's
B)  Polian
C)  holothurion
D)  Cuverian
E)  malpighian D

Question 18

Embryologically,the echinoderm water vascular system originates as modification of the

Accepted Answer

A)  pyloric cecae.
B)  dermal branchiae.
C)  coelom.
D)  Tiedemann's bodies.
E)  closed circulatory system.

Question 19

The principal nitrogenous waste of sea stars is

Accepted Answer

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

Question 20

The characteristic larval stage of brittle stars is the

Accepted Answer

A)  dipleurula.
B)  brachiolaria.
C)  bipinnaria.
D)  ophiopluteus.
E)  echinopluteus.

Exam 16: Ambulacraria: Echinoderms and Hemichordates

In sea stars,contraction of the __________ force water into the tube feet of the water vascular system.

Correct Answer
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Correct Answer
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Synchronous spawning by enteropneusts suggests the presence of

Correct Answer
verified

The skeleton of sea urchins consists of ten sets of closely fitting plates and is called a(n)

Correct Answer
verified

The echinoderms that most closely resemble fossil forms are the

Correct Answer
verified

Sea cucumbers belong to the echinoderm class

Correct Answer
verified

If a brittle star is grasped by an arm,certain muscles may contract to serve and cast off the arm in a process called

Correct Answer
verified

Regeneration of lost parts of a sea star also serves in

Correct Answer
verified

Sea daisies were formerly assigned to a class of their own.They have been recently assigned to the echinoderm class

Correct Answer
verified
A

Sea stars typically feed

Correct Answer
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D

Echinoderms and hemichordates are more closely related to mammals than to crabs and shrimp.Indicate below if this statement is True or False,followed by the correct reasoning for that answer.Check all of the answer choices that apply.

Correct Answer
verified

In Asteroidea the ________ system consists of strands of tissue that encircle the mouth near the ring canal and run into each arm near the radial canals.As in other echinoderms,this system probably transports digestive products,hormones,and other substances.

Correct Answer
verified

The water vascular system of echinoderms carries out many functions that are distributed through multiple systems in other animals.Which of the statements below are valid comparisons between the functions of the water vascular system and similar functions in arthropods? Check all that apply.

Correct Answer
verified

In the sea stars,a(n) __________ groove runs along the underside of each arm.

Correct Answer
verified

Coiled masses of fecal material called __________ are deposited on the substrate at one of the openings of the burrow of an enteropneust.

Correct Answer
verified

Which of the following is a characteristic of animals in the phylum Hemichordata?

Correct Answer
verified

Some sea cucumbers have special tubules of the respiratory tree that contains sticky secretions and toxins and can be everted through the anus; these are called __________ tubules.

Correct Answer
verified
D

Embryologically,the echinoderm water vascular system originates as modification of the

Correct Answer
verified

The principal nitrogenous waste of sea stars is

Correct Answer
verified

The characteristic larval stage of brittle stars is the

Correct Answer
verified

Exam 16: Ambulacraria: Echinoderms and Hemichordates

In sea stars,contraction of the __________ force water into the tube feet of the water vascular system.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Synchronous spawning by enteropneusts suggests the presence of

Correct AnswerverifiedShow Answer

The skeleton of sea urchins consists of ten sets of closely fitting plates and is called a(n)

Correct AnswerverifiedShow Answer

The echinoderms that most closely resemble fossil forms are the

Correct AnswerverifiedShow Answer

Sea cucumbers belong to the echinoderm class

Correct AnswerverifiedShow Answer

If a brittle star is grasped by an arm,certain muscles may contract to serve and cast off the arm in a process called

Correct AnswerverifiedShow Answer

Regeneration of lost parts of a sea star also serves in

Correct AnswerverifiedShow Answer

Sea daisies were formerly assigned to a class of their own.They have been recently assigned to the echinoderm class

Correct AnswerverifiedA

Sea stars typically feed

Correct AnswerverifiedD

Echinoderms and hemichordates are more closely related to mammals than to crabs and shrimp.Indicate below if this statement is True or False,followed by the correct reasoning for that answer.Check all of the answer choices that apply.

Correct AnswerverifiedShow Answer

In Asteroidea the ________ system consists of strands of tissue that encircle the mouth near the ring canal and run into each arm near the radial canals.As in other echinoderms,this system probably transports digestive products,hormones,and other substances.

Correct AnswerverifiedShow Answer

The water vascular system of echinoderms carries out many functions that are distributed through multiple systems in other animals.Which of the statements below are valid comparisons between the functions of the water vascular system and similar functions in arthropods? Check all that apply.

Correct AnswerverifiedShow Answer

In the sea stars,a(n) __________ groove runs along the underside of each arm.

Correct AnswerverifiedShow Answer

Coiled masses of fecal material called __________ are deposited on the substrate at one of the openings of the burrow of an enteropneust.

Correct AnswerverifiedShow Answer

Which of the following is a characteristic of animals in the phylum Hemichordata?

Correct AnswerverifiedShow Answer

Some sea cucumbers have special tubules of the respiratory tree that contains sticky secretions and toxins and can be everted through the anus; these are called __________ tubules.

Correct AnswerverifiedD

Embryologically,the echinoderm water vascular system originates as modification of the

Correct AnswerverifiedShow Answer

The principal nitrogenous waste of sea stars is

Correct AnswerverifiedShow Answer

The characteristic larval stage of brittle stars is the

Correct AnswerverifiedShow Answer

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A

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D

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D

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