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. Sea stars are carnivores and are among the most important predators in many marine ecosystems.
____ 5. 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.
Identify the letter of the choice that best completes the statement or answers the question.
____ 6. Embryological evidence suggests that the echinoderms are closely related to the
a. vertebrates. c. annelids.
b. arthropods. d. arachnids.
____ 7. 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.
____ 8. Which of the following is not a food source for sea stars?
a. clams c. oysters
b. cnidarians d. sponges
____ 9. 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
____ 10. Sea stars can reproduce asexually by
a. growing longer and longer arms that eventually break off and form new individuals.
b. growing an extra arm that separates from the parent and forms a new individual.
c. dividing in half; each half regenerating the missing half, and forming two new individuals.
d. All of the above
____ 11. The subphylum Vertebrata includes all of the following except
a. fish. c. reptiles.
b. lancelets. d. birds.
____ 12. 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.
____ 13. Lancelets
a. are animals that live near the ocean surface.
b. filter food from water that enters the mouth.
c. have chordate features only in the larvae stage.
d. are the first animals that evolved backbones.
____ 14. Which embryonic chordate characteristics do lancelets retain as adults?
b. notochord and dorsal nerve cord
c. notochord, dorsal nerve cord, and postanal tail
d. notochord, dorsal nerve cord, postanal tail, and pharyngeal pouches
____ 15. 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
Complete each sentence or statement.
16. Refer to the illustration above. The animals shown are members of the phylum ____________________.
17. Sea cucumbers belong to the phylum ____________________.
18. A sand dollar is a member of the phylum ____________________.
19. The system of interconnected canals and tube feet in echinoderms is called a(n) ____________________
20. Adult tunicates have a tough sac made out of ____________________ that surrounds their bodies.
1. ANS: T PTS: 1
2. ANS: F PTS: 1
3. ANS: T PTS: 1
4. ANS: T PTS: 1
5. ANS: T PTS: 1
6. ANS: A PTS: 1
7. ANS: C PTS: 1
8. ANS: D PTS: 1
9. ANS: B PTS: 1
10. ANS: C PTS: 1
11. ANS: B PTS: 1
12. ANS: A PTS: 1
13. ANS: B PTS: 1
14. ANS: D PTS: 1
15. ANS: A PTS: 1
16. ANS: Echinodermata
17. ANS: Echinodermata
18. ANS: Echinodermata
19. ANS: water-vascular
20. ANS: cellulose