CHAPTER 33 Sponges
Practice Test
Collar cells
a.
draw water into the body of a sponge.
b.
are parasitic protozoa.
c.
produce cytochrome oxidase.
d.
are specialized for reproduction.
a
The phylum Cnidaria includes all of the following
except
a.
b.
corals.
squids.
c.
d.
b
jellyfish.
sea anemones.
The class of cnidarians that typically live only as
polyps is the
a.
Anthozoa.
c.
Hydrozoa.
b.
Scyphozoa.
d.
None of the above
a
Sponges can reproduce
a.
by a breakup of the original parent into
fragments that each become a new sponge.
b.
sexually, using sperm and eggs.
c.
by the budding of new sponges from the
parent.
d.
All of the above
c
Refer to the illustration above.
Which organism is most closely
related to a jellyfish?
a.
3
c.
4
b.
1
d.
2
a
The gemmules of sponges
a.
create water currents for feeding.
b.
are equivalent to the sperm cells of higher
animals.
c.
are necessary for one form of asexual
reproduction.
d.
are equivalent to the egg cells of higher
animals.
c
The hydra is unique among the hydrozoans
because it
a.
is an active swimmer.
b.
is strictly a marine species.
c.
lives in colonies.
d.
has no medusa stage.
d
Which of the following is a characteristic
associated only with cnidarians?
a.
choanocytes containing nematocysts
b.
cnidocytes specialized for defense and
capturing prey
c.
a parasitic life cycle
d.
a digestive tract with a single opening
b
In sponges, currents that draw water through the
organism are created by
a.
gemmules.
c.
amoebocytes.
b.
collar cells.
d.
spicules.
b
Spicules are
a.
flexible protein fibers.
b.
hard spike-like structures in the wall of a
sponge.
c.
similar to seeds; a complete sponge can
grow from each spicule.
d.
used for taking in food and water.
b
Sponges obtain food
a.
through photosynthesis.
b.
by filtering small organisms from the water.
c.
with their spongin.
d.
by using their spicules to paralyze protozoa.
b
Which of the following is not sessile as an adult?
a.
Portuguese man-of-war
b.
sponge
c.
coral
d.
sea anemone
a
Refer to the illustration above. Which
organism captures its prey using
nematocysts?
a.
2
c.
4
b.
3
d.
1
c
Which of the following is not a characteristic of
ctenophores?
a.
movement by means of beating cilia
b.
bioluminescence
c.
use of cnidocytes to capture prey
d.
hermaphrodism
c
Adult sponges
a.
are active swimmers.
b.
possess true tissues.
c.
have body walls with many pores.
d.
use stinging cells to capture prey.
c
Hermaphroditic organisms
a.
produce both eggs and sperm.
b.
possess only male amoebocytes.
c.
have gemmules that are fertilized by
amoebocytes.
d.
reproduce only by asexual means.
a
Which of the following distinguishes sponges from
other invertebrates?
a.
They obtain nutrients by diffusion rather than
by ingestion.
b.
They reproduce only asexually.
c.
They are not motile in any stage of their life
cycle.
d.
Their cells are not organized into tissues.
d
collar cell : water ::
a.
osculum : mesenchyme
b.
spongin : food
c.
amoebocyte : nutrients and wastes
d.
spicule : water
c
Skeletal support in sponges may be provided by
a.
fibers called spongin.
b.
spicules of calcium carbonate.
c.
spicules of silicon dioxide.
d.
All of the above
d
The cnidarian’s inner layer of tissue is specialized
for
a.
digestion. c.
capturing prey.
b.
reproduction.
d.
All of the above
a
Anthozoans include
a.
jellyfish.
b.
hydras.
c.
sea anemones and corals.
d.
the Portuguese man-of-war.
c
Scyphozoans, such as jellyfish, spend most of their
lives as
a.
medusae. c.
polyps.
b.
corals.
d.
parasites.
a
sponges : fewer than three body layers ::
a.
ctenophores : no body symmetry
b.
cnidarians : nerve net
c.
sponges : bilateral symmetry
d.
cnidarians : choanocytes
b
Hermaphrodism is advantageous in sponges
because
a.
they are sessile.
b.
they reproduce asexually.
c.
they have gemmules.
d.
None of the above is true; hermaphrodism
does not occur in sponges.
a
The End