Name: 

Sponges and Cnidarians

 
True/False
Indicate whether the sentence or statement is true or false.
 

1. 

Sponges are filter feeders.
 

2. 

Sponges are capable of total regeneration, even from the smallest pieces of their bodies.
 

3. 

Polyps are a body form of cnidarians that are specialized for swimming.
 

4. 

Cnidarians are characterized by stinging nematocysts.
 

5. 

The life cycle of anthozoans includes medusae, planulae, and polyps.
 

6. 

Ctenophores lack a nervous system that coordinates their activities, so their movements are erratic.
 

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

     

7. 

Refer to the illustration above. Which organism in the diagrams is most closely related to a jellyfish?
a.
Organism “A”
c.
Organism “C”
b.
Organism “B”
d.
Organism “D”
 

8. 

Spicules are
a.
flexible protein fibers.
b.
hard needle-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.
 

9. 

Skeletal support in sponges may be provided by
a.
spicules of calcium carbonate.
c.
spongin fibers.
b.
spicules of silicon dioxide.
d.
All of the above
 

10. 

Sponges obtain food
a.
by photosynthesis.
b.
by using their spicules to paralyze protozoa.
c.
by filtering small organisms from the water.
d.
with spongin.
 

11. 

In sponges, currents that draw water through the organism are created by
a.
amoebocytes.
c.
gemmules.
b.
collar cells.
d.
spicules.
 

12. 

Hermaphroditic organisms
a.
reproduce only by asexual means.
b.
produce both eggs and sperm.
c.
have gemmules that are fertilized by amoebocytes.
d.
possess only male amoebocytes.
 

13. 

Sponges can reproduce
a.
by the budding of new sponges from the parent.
b.
by a breakup of the original parent into fragments that each become a new sponge.
c.
sexually, using the production of sperm and eggs.
d.
All of the above
 

14. 

freshwater sponges : gemmules ::
a.
hermaphrodites : eggs and sperm
c.
gemmules : sperms
b.
gemmules : eggs
d.
amoebocytes : eggs
 
 
      sponges_and_cnidari_files/i0180000.jpg
 

15. 

Refer to the illustration above. Which organism in the diagrams captures its prey using nematocysts?
a.
Organism “A”
c.
Organism “C”
b.
Organism “B”
d.
Organism “D”
 

16. 

The outer cell layer of a cnidarian is the
a.
ectoderm.
c.
endoderm.
b.
mesoglea.
d.
epidermis.
 

17. 

The phylum Cnidaria includes all of the following except
a.
jellyfish.
c.
sea anemones.
b.
squids.
d.
corals.
 

18. 

Sea anemones are
a.
medusae.
c.
larvae.
b.
polyps.
d.
eggs.
 
 
The diagram below illustrates the life cycle of the jellyfish.

     
 

19. 

Refer to the illustration above. Which stage is called a planula?
a.
Stage “1”
c.
Stage “3”
b.
Stage “2”
d.
None of the above
 

20. 

Anthozoans include organisms known as
a.
jellyfish.
c.
Portuguese men-of-war.
b.
hydras.
d.
sea anemones and corals.
 



 
Check Your Work     Reset Help