Name: 
 

Chapter 33



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

 1. 

What is the best way to describe the brain of a sea anemone?
a.
a thick ring around the mouth
b.
a series of ganglia at the base of the tentacles
c.
a pair of ganglia at the anterior end
d.
a single ganglion in the body wall
e.
nonexistent
 

 2. 

Which of the following is a correct statement about members of the phylum Cnidaria? They
a.
are not capable of locomotion because they lack true muscle tissue.
b.
are primarily filter feeders.
c.
have either or both of two body forms: mobile polyps and sessile medusae.
d.
may use a gastrovascular cavity as a hydrostatic skeleton.
e.
are the simplest organisms with a complete alimentary canal (two openings).
 

 3. 

What would be the most effective method of reducing the incidence of blood flukes in a human population?
a.
Reduce the mosquito population.
b.
Reduce the freshwater snail population.
c.
Purify all drinking water.
d.
Avoid contact with rodent droppings.
e.
Carefully wash all raw fruits and vegetables.
 

 4. 

The larvae of many common tapeworms affecting humans are usually found
a.
encysted in human muscle.
b.
encysted in the muscle of an animal such as a cow or pig.
c.
in the abdominal blood vessels of humans.
d.
in the human brain.
e.
in the intestines of cows and pigs.
 

 5. 

While sampling marine plankton in a lab, a student encounters large numbers of fertilized eggs. She rears some of the eggs in the laboratory for further study and finds that the blastopore becomes the mouth. The embryo develops into a trochophore larva and eventually has a coelom. These eggs probably belonged to a(n)
a.
annelid.
b.
echinoderm.
c.
mollusc.
d.
nematode.
e.
arthropod.
 

 6. 

Which of the following is not characteristic of nematodes?
a.
They play an important role in decomposition.
b.
They have both circular and longitudinal muscles.
c.
They have a pseudocoelom.
d.
They have an alimentary canal.
e.
Many species are parasitic.
 

 7. 

Humans most frequently acquire trichinosis by
a.
having sexual contact with an infected partner.
b.
eating undercooked pork.
c.
inhaling the eggs of worms.
d.
eating undercooked beef.
e.
being bitten by tsetse flies.
 

 8. 

Nematode worms and annelid worms share all of the following features except
a.
use of fluid in the body cavity as a hydrostatic skeleton.
b.
use of the outer covering as a respiratory surface.
c.
presence of a closed circulatory system.
d.
presence of an alimentary canal.
e.
parasitic lifestyles in some species.
 

 9. 

All of the following are characteristics of adult arthropods except
a.
an exoskeleton.
b.
hemolymph.
c.
jointed appendages.
d.
a heart.
e.
a coelom.
 

 10. 

Among the invertebrates, arthropods are unique in possessing
a.
a cuticle.
b.
a ventral nerve cord.
c.
open circulation.
d.
wings.
e.
segmented bodies.
 

 11. 

A terrestrial animal species is discovered with the following larval characteristics: exoskeleton, tracheal system for gas exchange, and modified segmentation. A knowledgeable zoologist would predict that its adults probably also would have
a.
eight legs.
b.
two pairs of antennae.
c.
a sessile lifestyle.
d.
an open circulatory system.
e.
parapodia.
 

 12. 

Which of the following is a characteristic of adult echinoderms?
a.
secondary radial symmetry
b.
spiral cleavage during early embryonic development
c.
gastrovascular cavity
d.
exoskeleton
e.
a lophophore
 
 
For the following questions, match the descriptions with the correct phylum below. Each choice may be used once, more than once, or not at all.

A.
Cnidaria
B.
Annelida
C.
Mollusca
D.
Arthropoda
E.
Echinodermata
 

 13. 

protostomes that have an open circulatory system and an exoskeleton of chitin
a.
A
b.
B
c.
C
d.
D
e.
E
 

 14. 

protostomes with a unique drape of tissue that may secrete a shell
a.
A
b.
B
c.
C
d.
D
e.
E
 

 15. 

a diploblastic phylum of aquatic predators
a.
A
b.
B
c.
C
d.
D
e.
E
 

 16. 

deuterostomes that have an endoskeleton
a.
A
b.
B
c.
C
d.
D
e.
E
 

 17. 

protostomes that have a closed circulatory system and obvious segmentation
a.
A
b.
B
c.
C
d.
D
e.
E
 



 
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