Deck 14: Chaetognaths, Echinoderms, and Hemichordates

Question 1

Brittle stars move rapidly for echinoderms.

Answer 1

True

Question 2

The water vascular system of sea stars opens to the outside through the madreporite.

Answer 2

True

Question 3

The regular urchins have become secondarily bilateral.

Answer 3

False

Question 4

According to recent reclassification,the Chaetognatha are now included in the Ecdysozoa.
Multiple Choice Questions

Question 5

Combinations of characteristics only found in the Phylum Echinodermata are ossicles,water-vascular system,and pedicellarie.

Question 6

Hemichordates show relationships to both the echinoderms and the chordates.

Question 7

The ambulacral grooves of asteroids are closed.

Question 8

The function of the papulae in the sea star is

A)respiration.
B)excretion.
C)reproduction.
D)digestion.

Question 9

The ophiuroids have no

A)pedicellariae.
B)papulae.
C)anus.
D)all of these

Question 10

The five pairs of bursae in brittle stars are used for

A)digestion and excretion.
B)respiration and reproduction.
C)reproduction and digestion.
D)circulation and digestion.

Question 11

A unique characteristic of echinoderms is

A)the endoskeleton of plates or ossicles.
B)the water-vascular system.
C)pedicellariae.
D)all of these

Question 12

The fossil record indicates crinoids are more numerous now than during prehistoric times.

Question 13

Sea stars

A)live in brackish waters.
B)have bilateral symmetry.
C)use their tube feet for locomotion.
D)feed on seaweeD.

Question 14

The echinoids

A)have five long,slender arms.
B)are enclosed in a test.
C)do not have tube feet.
D)have open ambulacral grooves.

Question 15

Echinoderms

A)are clearly related to cnidarians because of their radial symmetry.
B)may have evolved from a sessile ancestor.
C)probably evolved from pterobranch hemichordates.
D)do not show relationships to any other group of animals.

Question 16

Echinoderms have the ability to osmoregulate regardless of the salinity of the water and are thus found in marine and brackish waters.

Question 17

The madreporite of asteroids leads directly the radial canals.

Question 18

Sea cucumbers have an elongated body,and they typically lie on one side.

Question 19

The anus of asteroids is located on the aboral side of the animal.

Question 20

Class Asteroidea

A)have pentaradial symmetry.
B)feeds on clams.
C)feeds on other echinoderms.
D)all of the above

Question 21

Of the echinoderms,regeneration and autotomy are most pronounced in the

A)ophiuroids.
B)asteroids.
C)holothuroids.
D)echinoids.
Fill in the Blank Questions

Question 22

Of the two classes of Hemichordata,a crown of tentacles is borne by members of the class ___________________.

Question 23

The basic five arms of crinoids are usually branched to form many more,each of which bears barb-like _____________.

Question 24

The respiratory tree of sea cucumbers opens into the ________________.

Question 25

When a sea star feeds on a clam,it inserts its _____________ between the two valves.

A)madreporite
B)stomach
C)ampulla
D)pyloric ceca

Question 26

The hemichordates are

A)bottom-dwelling marine animals.
B)deuterostomes.
C)fairly worldwide in distribution.
D)all of these

Question 27

One of the principal functions of the tube feet in brittle stars is ___________.

Question 28

Acorn worms

A)belong to the phylum HemichordatA.
B)have a proboscis,collar,and trunk.
C)are marine animals with gill slits.
D)all of these

Question 29

The Class ______________ have internal respiratory trees and can eject Cuvierian tubules for defense.

Question 30

A system of unknown function in echinoderms,consisting of tissue strands enclosing unlined channels is the ______________ system.

Question 31

On the inner end of each tube foot is a muscular sac called an ______________.

Question 32

The common name for the enteropneusts is _____________.

Question 33

Acornworms

A)are usually found in deep water zones.
B)do not have hearts but do have blood vessels.
C)have gill pores and gill slits.
D)all of the above

Question 34

The larvae of echinoderms have __________ symmetry.

Question 35

It is generally accepted the ancestral deuterstome was a marine bilateral free-moving form with _____________.

Question 36

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

Question 37

Minute,pincer like _________________ are found on the surfaces of many sea stars.

Question 38

The ancestor of the echinoderms had __________ symmetry.

Question 39

A complex chewing apparatus found in many urchins is the _____________.

Question 40

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

Question 41

Characteristics of the hemichordates that are shared with the chordates are the ____________ and ______________.

Question 42

Water for suspension feeding in the hemichordates is driven by ____________.

Question 43

The Chaetognatha appear to be morphologically similar to deuterostomes,but in fact may be __________________.

Question 44

Sea stars have light sensitive organs,the _____________,at the ends of their arms.