Question 1

Which of the following are considered "irregular" urchins?

Accepted Answer

A)   Sea urchins that swim
B)   Sand dollars and heart urchins
C)   Sea cucumbers
D)   Crinoids
E)   Brittle starsF) C) and E)
G) A) and B)

Question 2

The larva of enteropneust hemichordates is known as a ________________.

Accepted Answer

The answer of The larva of enteropneust hemichordates is known...

Question 3

The fossil record of echinoderms

Accepted Answer

A)   is sparse with few representatives.
B)   shows echinoderms were a fairly modern group to arise.
C)   indicates early echinoderms were sessile and pentaradial but had a bilateral ancestor.
D)   suggests early echinoderms were free-swimming and bilateral but became sessile and pentaradial in recent times.
E)   is a clear and detailed history of complex echinoderm evolution.F) A) and C)
G) A) and E)

Question 4

During metamorphosis of sea stars,the left side of the larva becomes the oral surface of the adult,and the right side becomes the ___________ surface.

Accepted Answer

The answer of During metamorphosis of sea stars,the left side...

Question 5

The role of the hemal system is best described as

Accepted Answer

A)   circulatory.
B)   excretory.
C)   an accessory gland to the reproductive system.
D)   a component of the nervous system.
E)   still not known for certain.F) A) and B)
G) A) and C)

Question 6

The basic five arms of crinoids are usually branched to form many more,each of which bears barblike ___________.

Accepted Answer

The answer of The basic five arms of crinoids are...

Question 7

Hemichordates were not recognized until the 1800s because they

Accepted Answer

A)   were considered roundworms.
B)   are very rare.
C)   are common but only around deep ocean vents.
D)   have recently dramatically increased in numbers.
E)   had secretive habits and fragile bodies.F) A) and B)
G) All of the above

Question 8

The orientation of a sea star is

Accepted Answer

A)   a dorsal mouth and a ventral spiny surface facing upward.
B)   an oral mouth facing downward and an aboral spiny surface.
C)   an anterior mouth and a posterior spiny surface.
D)   a dorsal oral mouth and a ventral-aboral spiny surface.
E)   a ventral mouth and an anti-ventral spiny surface.F) A) and C)
G) B) and D)

Question 9

The common name for chaetognaths is

Accepted Answer

A)   arrow worms.
B)   acorn worms.
C)   spoon worms.
D)   lancelets.
E)   elvers.F) A) and B)
G) A) and C)

Question 10

Superphylum Ambulacraria contains two deuterostome phyla: Echinodermata and ____________.

Accepted Answer

The answer of Superphylum Ambulacraria contains two deuterostome phyla: Echinodermata...

Question 11

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

Accepted Answer

A)   a glomerulus or network of blood vessels that surround the sinus and buccal diverticulum.
B)   a rich supply of blood vessels in the gill slits.
C)   a network of flame cells at the periphery.
D)   a simple metanephridium that empties into the cloaca.
E)   a network of vessels under the epidermis.F) A) and D)
G) A) and C)

Question 12

If you went to the ocean and brought back a sea star to keep in a marine aquarium,what would you feed it?

Accepted Answer

A)   Algae
B)   Live clams
C)   Live fish
D)   Water in plankton since they are filter feeders
E)   Living coralF) None of the above
G) A) and B)

Question 13

Arrow worm anatomy

Accepted Answer

A)   lacks any coelom.
B)   lacks a complete digestive tract.
C)   has gills.
D)   has well-developed circulatory and excretory systems.
E)   is unlike any other invertebrate in having a many-layered epidermis.F) D) and E)
G) C) and E)

Question 14

The most active of all echinoderms are the

Accepted Answer

A)   sea urchins.
B)   sea stars.
C)   sea cucumbers.
D)   brittle stars.
E)   crinoids.F) B) and E)
G) A) and B)

Question 15

A calcareous sieve leading to the watervascular system is the ________________ or sieve plate.

Accepted Answer

The answer of A calcareous sieve leading to the watervascular...

Question 16

Sea stars reproduce mostly

Accepted Answer

A)   by budding.
B)   only asexually by intentionally breaking off appendages.
C)   sexually, usually with separate sexes.
D)   sexually, with both sex organs on same organism, similar to earthworms, with cross-fertilization.
E)   sexually, with both sex organs on same organism, but by self-fertilization.F) C) and E)
G) A) and C)

Question 17

The mouth of the brittle star is surrounded by five movable plates that serve as ___________.

Accepted Answer

The answer of The mouth of the brittle star is...

Question 18

________________ larvae of nonbrooding echinoids may live a planktonic existence for several months and then metamorphose into young urchins.

Accepted Answer

The answer of ________________ larvae of nonbrooding echinoids may live...

Question 19

Hemichordates are marine animals that were formerly considered a subphylum of ____________.

Accepted Answer

The answer of Hemichordates are marine animals that were formerly...

Question 20

The early embryology of hemichordates is much like that of the ___________________.

Accepted Answer

The answer of The early embryology of hemichordates is much...

Exam 22: Chaetognaths, Echinoderms, and Hemichordates

During metamorphosis of sea stars,the left side of the larva becomes the oral surface of the adult,and the right side becomes the ___________ surface.

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The orientation of a sea star is

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Hemichordates are marine animals that were formerly considered a subphylum of ____________.

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A calcareous sieve leading to the watervascular system is the ________________ or sieve plate.

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The mouth of the brittle star is surrounded by five movable plates that serve as ___________.

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

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Superphylum Ambulacraria contains two deuterostome phyla: Echinodermata and ____________.

Correct AnswerverifiedShow Answer

If you went to the ocean and brought back a sea star to keep in a marine aquarium,what would you feed it?

Correct AnswerverifiedShow Answer

Hemichordates were not recognized until the 1800s because they

Correct AnswerverifiedShow Answer

The role of the hemal system is best described as

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The early embryology of hemichordates is much like that of the ___________________.

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The larva of enteropneust hemichordates is known as a ________________.

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Which of the following are considered "irregular" urchins?

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Arrow worm anatomy

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________________ larvae of nonbrooding echinoids may live a planktonic existence for several months and then metamorphose into young urchins.

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Sea stars reproduce mostly

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The common name for chaetognaths is

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The basic five arms of crinoids are usually branched to form many more,each of which bears barblike ___________.

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The fossil record of echinoderms

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The most active of all echinoderms are the

Correct AnswerverifiedShow Answer

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