Name:
Worksheet
20p.
Flatworms
1. What type of reproduction do tapeworms use?
1p.
2. Explain how flatworms differ from sponges and cnidarians (symmetry, tissues,
nervous system)
3p.
3. Name two groups of flatworms.
1p.
4. Why might it be an adaptive advantage for a parasite not to kill its host?
2p.
5. Which of the following is the sequence of structures in the life cycle of a fluke?
1p.
a. Larva, egg, intermediate host, final host
b. Egg, larva, intermediate host, final host
c. Final host, larva, egg, intermediate host
d. Egg, larva, final host, intermediate host
6. Explain why it is important to avoid contact with soil in areas where parasites are
common.
1p.
7. Describe the flatworm body structure.
3p.
Sponges and cnidarians
8. Describe the three types of sponge skeletons.
1.5p.
9. Use each of the following terms in a separate sentence.
2p.
Planula………………………………………………………………………………………………...
Cnidocyte………………………………………………………………………………………………
10. Which of the following is NOT a characteristic of sponges?
1p.
a.
b.
c.
d.
Body wall penetrated by many pores
Cells organized into tissues
Collar cells that trap food particles
Amebocytes that transport food
11. What is one function of choanocytes in a sponge?
a. Supporting the body
b. Fertilizing eggs
c. Distributing nutrients
d. Moving water
1p.
12. The Portuguese man-of-war is often referred to as a jellyfish, and indeed it floats on
the surface of the ocean as jellyfish do. In what ways is the Portuguese man-of-war
different from typical jellyfish?
2p.
13. Why are spongin and spicules important to a sponge?
0.5p.