Name:     ID: 
 
Email: 

Ch. 27 Test A

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
Which of the following is NOT true about flatworms?
a.
They have a fluid-filled body cavity called a coelom.
b.
They are the simplest animals to have three embryonic germ layers.
c.
They are acoelomates.
d.
They are bilaterally symmetrical.
 

 2. 
In free-living flatworms, what organ pumps food into the digestive cavity?
a.
coelom
c.
pharynx
b.
ganglia
d.
flame cells
 

 3. 
Many flatworms can detect changes in the amount of light in their environment using groups of cells called
a.
flame cells.
c.
ganglia.
b.
nerve cords.
d.
eyespots.
 

 4. 
In the tapeworm, both male and female reproductive organs are contained in each mature
a.
scolex.
c.
cyst.
b.
proglottid.
d.
egg.
 

 5. 
In a pseudocoelom, mesoderm partially lines the
a.
germ layer.
c.
blood vessels.
b.
body cavity.
d.
pharynx.
 

 6. 
Which of the following is NOT true about roundworms?
a.
They have a digestive system with two openings.
b.
They have specialized tissues and organ systems.
c.
They are segmented worms.
d.
They have pseudocoeloms.
 

 7. 
What causes the disease called elephantiasis?
a.
flukes
c.
hookworms
b.
filarial worms
d.
ascarid worms
 

 8. 
Which of these animals has a true coelom?
a.
filarial worm
c.
planarian
b.
tapeworm
d.
leech
 

 9. 
In annelids, nitrogen-containing wastes are eliminated by
a.
clitella.
c.
nephridia.
b.
parapodia.
d.
gills.
 

 10. 
The muscular extension of a leech that penetrates the tissue of its host is the
a.
septum.
c.
proboscis.
b.
radula.
d.
ganglion.
 

 11. 
The larvae of many marine annelids are ecologically important because they
a.
poison coral reefs.
b.
are eaten by fishes and other marine animals.
c.
feed on earthworms.
d.
none of the above
 

 12. 
Which of the following is NOT true about mollusks?
a.
They usually have an external or internal shell.
b.
They are all filter feeders.
c.
They are soft-bodied animals.
d.
They have tube-shaped nephridia to remove ammonia from blood.
 

 13. 
The tubelike structure through which water enters and leaves a mollusk’s body is the
a.
sinus.
c.
coelom.
b.
siphon.
d.
mantle cavity.
 

 14. 
The most active mollusks are the
a.
gastropods.
c.
bivalves.
b.
cephalopods.
d.
nudibranchs.
 

 15. 
Which cephalopods have external shells?
a.
nautiluses
c.
octopi
b.
squid
d.
cuttlefish
 

Completion
Complete each statement using the folowing terms:

polychaetes         mesoderm         foot          gizzard         hermaphrodite
 

 16. 
A coelom is a fluid-filled body cavity that is lined with tissue derived from the ____________________.
 

 

 17. 
A(an) ____________________ is an individual organism that has both male and female reproductive organs.
 

 

 18. 
In an earthworm’s digestive system, the ____________________ grinds food into small pieces.
 

 

 19. 
Sandworms and bloodworms are members of the class of marine annelids called ____________________.
 

 

 20. 
A cephalopod’s ____________________ is divided into tentacles, or arms.
 

 



 
         Start Over