1. What are rhabdites and what function do they serve? 2. What are flame cells and what is their function? 3. Explain how an intermediate host is important in the life cycle of Clonorchis. 4. Explain the difference between monoecious and dioecious. 5. In the life cycle of Dipylidium caninum, what are the principal host and the intermediate host? In the life cycle of Taenia pisiformis? 6. Tapeworms have no digestive tract. How do they obtain the necessary nutrients for life?.