Worm and Mollusc Review
Name:________________________
Class Period:___________________
1. In bilaterally symmetric animals, the term "bilateral" indicates that there are two ways
of cutting the body to get two identical halves.
B) False. There is only one plane of symmetry
2. Platyhelminths have a centralized nervous system, while Nemertea do not.
B) False. Both have a CNS
3. Platyhelminths have a complete digestive tract with mouth and anus, while Annelida
do not.
B) False. Platyhelminthes have an incomplete digestive tract.
4. Parasitic platyhelminths known as flukes typically infect a vertebrate as an adult,
though may infect an invertebrate as a larva.
A) True
5. Nemertean worms entangle prey with a proboscis everted from a cavity above the
mouth.
A) True
6. Marine nematode worms are hardly ever seen because they are relatively few in
number.
A) False. They are an abundant worm
7. Annelid worms have a body cavity, but nematode, nemertean, and platyhelminth
worms do not.
A) False…Nematodes have a body cavity.
8. Segments of polychaete worms usually have fleshy extensions called parapodia.
A) True
9. Polychaete worms, like earthworms on land, are all deposit feeders.
A) True
Worm and Mollusc Review
Name:________________________
Class Period:___________________
10. Pogonophoran worms differ from most other worms in that their digestive tracts are
filled with bacteria.
B)
False. They lack a digestive tract completely
11. Most molluscs have a radula, a ribbon-like structure that carries rows of small teeth.
A)
True
12. All molluscs have an external shell made of calcium carbonate.
B)
False. Some lack a shell and some have a reduced shell
13. Some gastropods use their radulas to scrape algae from rocks, and some are
carnivores that may use the radula to rasp a hole in a prey's shell.
A)
True
14. Most bivalves use their radular teeth like a filter to trap small particles in the water.
B)
False. Their gills / ctenidia trap food.
15. Cephalopods are highliy intelligent invertebrates
A)
True
16. Many Molluscs use their radulas to scrape algae off shoreline rocks.
A)
True
16. Squids and cuttlefish have internal shells.
A)
True
17. Bilateral symmetry means…. There is one way to make two mirrored images.
18. The feature that distinguished an open circulatory system from a closed circulatory
system is that… A closed circulatory system has blood vessels.
19. An incomplete digestive tract is different from a complete digestive tract in that it…
Has only one opening
Worm and Mollusc Review
Name:________________________
Class Period:___________________
20. Which of the following worms does NOT have a body divided into segments?..
All groups EXCEPT Annelides DO NOT have segments
21. Flatworms have a lot of complex characteristics except…
A body cavity, a complete digestive tract, eyes etc…
22. All of the following are flatworms except…
Platyhelminthes are flatworms
23. Ribbon worms have a unique feeding appendage called a…
Proboscis
24. Nematodes are the first animals to have a(n)…
Body Cavity
25. A head-like area is found in…
Chaetognatha
26. Segmentation is an advanced characteristic because…
It makes movement easier and leads to evolution of appendages
27. Pogonophorans lack a digestive tract but get food…
From symbiotic bacteria
28. Lophophores are…
Worms with a ciliated feeding tentacle called a lophophore
29. The mollusc body plan includes a foot, mantle, body cavity and…
Shell, bilateral symmetry, radula
30. Some molluscs make a shell. Shells are composed of…
Calcium carbonate
Worm and Mollusc Review
Name:________________________
Class Period:___________________
31. Some molluscs take in food through a tube like structure called a…
siphon
32. Some molluscs take in food through a tube like structure called a…
siphon
33. The ___________ are the most active type of mollusk…
cephalopods
34. The part of the mollusc that makes a shell is called the…
Mantle
35. Byssal threads are made by this type of mollusk…
Mussels
36. Molluscs with two shells are known as…
bivalves