3. Compare the characteristics of the three classes of Platyhelminthes by completing TABLE 2. 4. Explain the following concepts and indicate the relationship, if any, between these concepts. Graphically represent your answer: 4.1 Bilateria 4.2 Lophotrochozoa 4.3 Ecdysozoa 4.4 Protostomes 5. Answer the following questions on tripoblasticity: 5.1 What do you understand by the concept triploblasticity? 5.2 Why are these organisms classified as tripoblastic? 5.3 Of what benefits is triploblasticity for these organisms? 6. Describe the life cycles of a Schistosoma and Taenia species found in southern Africa with the aid of labelled diagrams. 7. What do you understand by the following concepts: 7.1 parasitic lifestyle 7.2 ecto-and endoparasites 7.3 hermaphroditic. 8. Discuss the relationship between bilateral symmetry and cephalisation with a suitable example from this phylum.
Study unit 3 28 Control your own answers. Discuss problems during contact session Practical Microscope work of slides and / or fresh/preserved material will be studied during the contact session.