Name: 

Echinoderm

 
True/False
Indicate whether the sentence or statement is true or false.
 

1. 

Chordates and echinoderms have a common ancestor.
 

2. 

None of the echinoderms living in the oceans today is sessile.
 

3. 

In addition to radial symmetry, echinoderms have a water-vascular system.
 

4. 

The hard, spiny skin of an echinoderm is called an exoskeleton.
 

5. 

All echinoderms except the sand dollar display a five-part radial symmetry.
 

6. 

The adult form of all echinoderms exhibits radial symmetry.
 

7. 

Sea stars are carnivores and are among the most important predators in many marine ecosystems.
 

8. 

In some echinoderms, respiration and waste removal are performed by skin gills.
 

9. 

A separated piece of a sea star can regenerate the rest of its body as long as the piece contains part of the central region of the animal.
 
 
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

10. 

Embryological evidence suggests that the echinoderms are closely related to the
a.
vertebrates.
c.
annelids.
b.
arthropods.
d.
arachnids.
 

11. 

The first organisms to develop a hardened endoskeleton were the
a.
echinoderms.
c.
arthropods.
b.
annelids.
d.
chordates.
 

12. 

Echinoderms
a.
are radially symmetrical as larvae and as adults.
b.
have an exoskeleton as adults.
c.
are bilaterally symmetrical as larvae and radially symmetrical as adults.
d.
are radially symmetrical as larvae and bilaterally symmetrical as adults.
 

13. 

The symmetry exhibited by echinoderms is
a.
bilateral.
c.
radial.
b.
spherical.
d.
mirror image.
 

14. 

In echinoderms and chordates, all the cells of the early embryo
a.
are controlled by molecules within the egg.
b.
form the “first mouth.”
c.
fall into four different categories.
d.
are identical.
 

15. 

The skeleton of an echinoderm is composed of individual plates called
a.
ocelli.
c.
odonata.
b.
ossicles.
d.
isopods.
 

16. 

sea cucumbers : a fused skeleton ::
a.
sea urchins : a five-part body plan
c.
sand dollars : endoskeletons
b.
sea urchins : distinct arms
d.
sea urchins : endoskeletons
 

17. 

Vertebrates, tunicates, and lancelets
a.
are all members of the phylum Chordata.
b.
all have a backbone in the adult stage.
c.
are all marine fish.
d.
are all terrestrial heterotrophs.
 

18. 

Which embryonic chordate characteristics do lancelets retain as adults?
a.
notochord
b.
notochord and dorsal nerve cord
c.
notochord, dorsal nerve cord, and postanal tail
d.
notochord, dorsal nerve cord, postanal tail, and pharyngeal pouches
 

19. 

tunicates : in shallow- and deep-water environments ::
a.
lancelets : buried in mud or sand
b.
lancelets : swimming near the water’s surface
c.
tentacles : in sea urchin mouths
d.
ossicles : in lancelets
 

20. 

Some scientists have hypothesized that the first vertebrates, which were fish, may have evolved from an ancestral tunicate that became sexually mature in the larval form. They suggest that these reproducing larvae were successful and natural selection reinforced the absence of metamorphosis to the adult. Which of the following statements does not support the hypothesis that vertebrates evolved from a sexually mature larval tunicate?
a.
Many invertebrates, tunicate larvae and adults, and the earliest vertebrates are or were filter feeders.
b.
Adult tunicates are sessile and larval tunicates are free-swimming.
c.
The vertebral column of adult vertebrates replaces the notochord present in embryonic vertebrates.
d.
Some living urochordates exist only as free-swimming larvae.
 



 
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