bio chapter 40

Question 1

larva stage of echinoderms

Answer 1

free swimming bilaterally symmetrical larvae

Question 2

adult stage of echinoderms

Answer 2

bottom dwelling with pentaradial symmetry .

Question 3

echinoderms have an endoskeleton made of

Answer 3

ossicles

Question 4

the class asteroidea consists of

Answer 4

sea stars.

Question 5

contraction of muscles surrounding the ampullae do what

Answer 5

extend the tube feet

Question 6

contraction of muscles lining the tube feet do what

Answer 6

retract the tube feet

Question 7

sea stars lack

Answer 7

circulatory, respiratory, and excretory systems

Question 8

a notochord is a

Answer 8

stiff but flexible rod of cells that runs the length of the body

Question 9

defining characteristics of chordates

Answer 9

dorsal nerve cord, pharyngeal pouches, postanal tail, and a notochord

Question 10

echinoderms and chordates are

Answer 10

deuterostomes

Question 11

deuterostomes are

Answer 11

coelomates whose embryos have radial cleavage.

Question 12

lancelets retain what chordate characteristics

Answer 12

all of them

Question 13

tunicate larva have

Answer 13

all the major chordate characteristics

Question 14

adult tunicates have

Answer 14

pouch like pharynx with slits