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Ch. 27 Test B

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

 1. 
Asexual reproduction in free-living flatworms takes place by the process known as
a.
budding.
c.
fertilization.
b.
fission.
d.
hermaphroditism.
 

 2. 
Some flatworms have clusters of nerve cells that control the nervous system. Each cluster is called a(an)
a.
ganglion.
c.
eyespot.
b.
brain.
d.
flame cell.
 

 3. 
Free-living flatworms, most of which live in marine environments or fresh water, are
a.
flukes.
c.
tapeworms.
b.
turbellarians.
d.
roundworms.
 

 4. 
An intermediate host is an organism in which a parasite
a.
reproduces asexually.
c.
causes tissue decay.
b.
reproduces sexually.
d.
clogs blood vessels.
 

 5. 
Which of the following is a parasitic roundworm?
a.
Trichinella
c.
a tapeworm
b.
Schistosoma
d.
a turbellarian
 

 6. 
Roundworms have a digestive system
a.
with two openings.
c.
within a true coelom.
b.
with one opening.
d.
none of the above
 

 7. 
To move, roundworms use their
a.
proglottids.
c.
tentacles.
b.
hydrostatic skeleton.
d.
pharynx.
 

 8. 
In earthworms, food is ground into small pieces in the
a.
crop.
c.
pharynx.
b.
gizzard.
d.
esophagus.
 

 9. 
The body of an annelid has
a.
a backbone.
c.
segments.
b.
an external shell.
d.
stinging tentacles.
 

 10. 
A type of annelid that is an external parasite is the
a.
tapeworm.
c.
leech.
b.
polychaete.
d.
earthworm.
 

 11. 
The bristlelike structures on some annelids’ bodies are called
a.
setae.
c.
nephridia.
b.
suckers.
d.
ganglia.
 

 12. 
Earthworm tunnels provide passageways for
a.
leeches.
c.
plant roots and water.
b.
polychaetes.
d.
planarians.
 

 13. 
The thin layer of tissue that covers a mollusk’s body is called the
a.
mantle.
c.
visceral mass.
b.
foot.
d.
shell.
 

 14. 
A pond snail is an example of a(an)
a.
gastropod.
c.
roundworm.
b.
flatworm.
d.
annelid.
 

 15. 
Filter-feeding bivalves can be used to monitor the environmental health of a habitat because
a.
the bivalves reproduce rapidly in polluted water.
b.
the bivalves concentrate pollutants and microorganisms in their tissues.
c.
the bivalves live near deep-sea vents.
d.
some bivalves never get cancer.
 

Completion
Complete each statement using the following terms:

closed         tentacles         flatworms         mesoderm         carnivores
 

 16. 
The simplest animals to have three embryonic germ layers, bilateral symmetry, and cephalization are the soft worms called ____________________.
 

 

 17. 
Many free-living roundworms are ____________________, which are animals that eat other animals.
 

 

 18. 
Annelids have a(an) ____________________ circulatory system in which blood is contained in a network of blood vessels.
 

 

 19. 
The type of embryonic tissue that lines a true coelom is called ____________________.
 

 

 20. 
The foot of most cephalopods is divided into eight or more arms called ____________________.
 

 



 
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