Question 1

If the radial nerve in an arm is cut,the podia in that arm lose coordination; if the circumoral nerve ring is cut,podia in all arms are uncoordinated and movement ceases.This indicates that

Accepted Answer

A)   the hydraulic system is not involved in movement of tube feet.
B)   the radial nerve controls the nerve ring.
C)   part of the function of tube feet is hydraulic and part is controlled by the nerve stimulation.
D)   water pressure in the hydraulic system is directly controlled by the nervous system.
E)   the sea star is aware of the extent it is damaged and can change behaviors to compensate.

Question 2

Hemichordates do not have a kidney,but they do have a single _____________.

Accepted Answer

The answer of Hemichordates do not have a kidney,but they...

Question 3

"Bipinnaria" describes the

Accepted Answer

A)   larval form of many echinoderms.
B)   central two-branched reproductive structures of sea stars.
C)   hydraulic system that controls the tube feet of sea urchins and sea stars.
D)   ability of these animals to grow into either males or females.
E)   underlying bilateral symmetry of an adult although it appears to be pentaradial.

Question 4

Small projections between the ossicles of sea stars that function in respiration are the ______________.

Accepted Answer

The answer of Small projections between the ossicles of sea...

Question 5

Hemichordates show relationships to

Accepted Answer

A)   arrow-worms.
B)   arthropods and annelids.
C)   molluscs and echinoderms.
D)   annelids and echinoderms.
E)   both the echinoderms and the chordates.

Question 6

The larvae of echinoderms have ______________ symmetry.

Accepted Answer

The answer of The larvae of echinoderms have ______________ symmetry....

Question 7

Which is NOT a correct association of structure and function in sea star anatomy?

Accepted Answer

A)   Ampullae-end of the tube foot that bears the sucker
B)   Polian vesicles-fluid storage
C)   Tiedemann's bodies-production of coelomocytes
D)   Lateral canals-connects the radial canal to the tube feet and has one-way valves
E)   Stone canal-joins the madreporite and ring canal

Question 8

A feature of the earliest echinoderms apparently was development of endoskeletal plates with ______________ structure.

Accepted Answer

The answer of A feature of the earliest echinoderms apparently...

Question 9

Within basic research,sea urchins have been a standard research animal in

Accepted Answer

A)   immunology.
B)   study of respiratory systems.
C)   study of bone.
D)   digestive anatomy.
E)   molecular embryology.

Question 10

________________ are pincer-like projections clustered on the skin of a sea star which serve to keep it clean of parasites and aquatic growth.

Accepted Answer

The answer of ________________ are pincer-like projections clustered on the...

Question 11

In echinoderms,the main coelomic compartment is

Accepted Answer

A)   missing.
B)   a somatocoel.
C)   completely converted into the water-vascular system.
D)   the pyloric stomach.
E)   restricted to a small space around the gonads.

Question 12

The complex chewing apparatus found in many sea urchins is the

Accepted Answer

A)   Ampulla.
B)   Aristotle's lantern.
C)   Hydrocoel.
D)   Pedicellariae.
E)   Petaloid.

Question 13

A system of unknown function consisting of tissue strands enclosing unlined channels is the __________ system.

Accepted Answer

The answer of A system of unknown function consisting of...

Question 14

The oral tentacles of the sea cucumber are

Accepted Answer

A)   modified tube feet.
B)   actually primitive lophophores.
C)   elaborated pedicellariae.
D)   also part of its respiratory tree.
E)   completely new structures evolved in this group.

Question 15

Ecologically,sea stars are at what trophic level?

Accepted Answer

A)   Producer
B)   Herbivore
C)   Top carnivore
D)   Omnivore
E)   Detritivore

Question 16

The larva of an acorn worm is

Accepted Answer

A)   always a juvenile that grows into a bigger adult.
B)   a tornaria larvae that resembles an echinoderm bipinnaria larvae.
C)   very close in structure to a tunicate larva.
D)   nearly identical to a lancelet.
E)   None of the choices are correct.

Question 17

Characteristics of the hemichordates that are shared with the echinoderms and are the basis for the clade Ambulacraria are a diffuse epidermal nervous system and _______ ________.

Accepted Answer

The answer of Characteristics of the hemichordates that are shared...

Question 18

Water for filter feeding in the hemichordates is driven by _________ _________.

Accepted Answer

The answer of Water for filter feeding in the hemichordates...

Question 19

The nervous system of an enteropneust hemichordate (or acorn worm) consists of

Accepted Answer

A)   a small brain and a dorsal ladder network of ganglia for each body segment.
B)   a network or plexus that runs underneath the epithelial cells that fuse to become ventral and dorsal neurochords.
C)   a small brain and a ventral ladder network of ganglia for each body segment.
D)   no brain but an extensive network of ganglia transferring information from sensory organs to the digestive system.
E)   no specialized nerves; the epitheliomuscular must respond to stimuli itself in a manner similar to the cnidarians.

Question 20

________________ is the porous plate on the aboral surface where water enters the water vascular system of a sea star.

Accepted Answer

The answer of ________________ is the porous plate on the...

Exam 22: Chaetognaths, Echinoderms, and Hemichordates

The oral tentacles of the sea cucumber are

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The larva of an acorn worm is

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"Bipinnaria" describes the

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Ecologically,sea stars are at what trophic level?

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The nervous system of an enteropneust hemichordate (or acorn worm) consists of

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Water for filter feeding in the hemichordates is driven by _________ _________.

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In echinoderms,the main coelomic compartment is

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Hemichordates do not have a kidney,but they do have a single _____________.

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Within basic research,sea urchins have been a standard research animal in

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Hemichordates show relationships to

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If the radial nerve in an arm is cut,the podia in that arm lose coordination; if the circumoral nerve ring is cut,podia in all arms are uncoordinated and movement ceases.This indicates that

Correct AnswerverifiedShow Answer

The larvae of echinoderms have ______________ symmetry.

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Which is NOT a correct association of structure and function in sea star anatomy?

Correct AnswerverifiedShow Answer

Characteristics of the hemichordates that are shared with the echinoderms and are the basis for the clade Ambulacraria are a diffuse epidermal nervous system and _______ ________.

Correct AnswerverifiedShow Answer

Small projections between the ossicles of sea stars that function in respiration are the ______________.

Correct AnswerverifiedShow Answer

A system of unknown function consisting of tissue strands enclosing unlined channels is the __________ system.

Correct AnswerverifiedShow Answer

A feature of the earliest echinoderms apparently was development of endoskeletal plates with ______________ structure.

Correct AnswerverifiedShow Answer

The complex chewing apparatus found in many sea urchins is the

Correct AnswerverifiedShow Answer

________________ are pincer-like projections clustered on the skin of a sea star which serve to keep it clean of parasites and aquatic growth.

Correct AnswerverifiedShow Answer

________________ is the porous plate on the aboral surface where water enters the water vascular system of a sea star.

Correct AnswerverifiedShow Answer

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Water for filter feeding in the hemichordates is driven by _ _.

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Characteristics of the hemichordates that are shared with the echinoderms and are the basis for the clade Ambulacraria are a diffuse epidermal nervous system and _ __.

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