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Ch. 29 Test A

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

 1. 
Which of the following did NOT occur during the Cambrian Explosion?
a.
Animals acquired specialized cells, tissues, and organ systems.
b.
There was an extraordinary growth in animal diversity.
c.
Animals evolved simpler body plans.
d.
Animal appendages became specialized for a variety of functions.
 

 2. 
One characteristic that made early animals different from all animals of today was their
a.
habitat.
c.
body plan.
b.
body segmentation.
d.
bilateral symmetry.
 

 3. 
Animals of the Cambrian Period typically had all of the following EXCEPT
a.
body symmetry.
c.
some type of skeleton.
b.
segmentation.
d.
a backbone.
 

 4. 
The classification of an animal as a deuterostome or a protostome is based on
a.
its body symmetry.
b.
whether or not it has a coelom.
c.
what happens to the blastopore.
d.
the number of germ layers it has.
 

 5. 
An acoelomate is an animal that has
a.
a body cavity lined with endoderm and ectoderm.
b.
a body cavity partially lined with mesoderm.
c.
a body cavity completely lined with mesoderm.
d.
no body cavity between the germ layers.
 

 6. 
Which invertebrates exhibit radial symmetry?
a.
cnidarians and echinoderms
c.
roundworms and annelids
b.
sponges and flatworms
d.
mollusks and arthropods
 

 7. 
Cephalization refers to the
a.
division of the body into upper and lower sides.
b.
concentration of sense organs and nerve cells in the front of the body.
c.
joining together of specialized cells to form tissues.
d.
formation of a body cavity between the germ layers.
 
 
nar001-1.jpg

Figure 29–1
 

 8. 
One animal that has a body construction like that shown in Figure 29-1 is a
a.
flatworm.
c.
sponge.
b.
roundworm.
d.
jellyfish.
 

 9. 
In Figure 29-1, the space labeled X is called a
a.
protostome.
c.
coelom.
b.
deuterostome.
d.
pseudocoelom.
 

 10. 
The distinguishing feature of a closed circulatory system is that
a.
it does not include a heart.
b.
blood is contained within vessels that extend throughout the body.
c.
blood is kept at low pressure.
d.
blood is circulated less efficiently than in an open circulatory system.
 

 11. 
Which structures are NOT part of an excretory system?
a.
flame cells
c.
Malpighian tubules
b.
spiracles
d.
nephridia
 

 12. 
Which of the following best describes uric acid?
a.
more toxic than ammonia, leaves the body through excretory pores
b.
more toxic than ammonia, leaves the body through the rectum
c.
less toxic than ammonia, leaves the body through excretory pores
d.
less toxic than ammonia, leaves the body through the rectum
 

 13. 
An example of an invertebrate with a hydrostatic skeleton is a(an)
a.
spider.
c.
sea star.
b.
sponge.
d.
earthworm.
 

 14. 
An endoskeleton is a
a.
shell of a mollusk.
b.
fluid-filled body cavity that supports the muscles.
c.
structural support located inside the body.
d.
hard body covering made of chitin.
 

 15. 
Which statement refers to sexual reproduction?
a.
All offspring are genetically identical to the parent.
b.
Offspring are produced from the fusion of male and female gametes.
c.
An organism breaks into pieces that grow into new individuals.
d.
New individuals are produced from outgrowths of the parent’s body wall.
 

Completion
Complete each statement using the following terms:

germ       hydrostatic       segmentation        aquatic       water
 

 16. 
Over the course of evolution, ____________________ allowed animals to increase in body size with a minimum of new genetic material.
 

 

 17. 
Echinoderms differ from cnidarians in that echinoderms develop from three embryonic ____________________ layers.
 

 

 18. 
If an invertebrate has gills, it most likely lives in a(an) ____________________ environment.
 

 

 19. 
The function of the structure labeled X in Figure 29-2 is to rid the body of excess ____________________.

co019-1.jpg

Figure 29–2
 

 

 20. 
If an animal moves by contracting muscles that surround a body cavity filled with fluid, the animal has a(an) ____________________ skeleton.
 

 



 
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