Chapter 29:
Echinoderms and Invertebrate Chordates
1.
Where is the dorsal nerve cord in Figure 29-5?
a.
within the tunic
b.
surrounding the pharynx
c.
along the heart and circulatory system
d.
it disappeared after the larval stage
Hint
2.
A sea star can hold tightly to the surface it is touching because of the _____.
a.
suction in the tube feet
b.
sieve in the madreporite
c.
endoskeleton
d.
eyespots
Hint
3.
When are feather stars sessile?
a.
They are sessile during all stages of life.
b.
in the adult stage
c.
in the larval stage
d.
in both larval and adult stages
Hint
4.
Identify the notochord in Figure 29-3.
a.
C
b.
B
c.
D
d.
A
Hint
5.
The notochord shown in Figure 29-3 is surrounded on two sides by what?
a.
exoderm
b.
endoderm
c.
mesoderm
d.
ectoderm
Hint
6.
An animal that retains its chordate features throughout life is the _____.
a.
sea squirt
b.
sand dollar
c.
lancelet
d.
seastar
Hint
7.
Where does water enter and leave from in a sea star?
a.
pedicellariae
b.
tube feet
c.
ampulla
d.
madreporite
Hint
8.
Which structure in Figure 29-4 is a characteristic only chordates have?
a.
B
b.
A
c.
D
d.
C
Hint
9.
What structure shown in the adult sea squirt in Figure 29-5 indicates it’s a chordate?
a.
anus
b.
gill slits
c.
ciliated grooves
d.
heart
Hint
10.
The type of symmetry found in all adult echinoderms is _____.
a.
horizontal
b.
bilateral
c.
radial
d.
regional
Hint
