Tapeworms 1. In the life cycle of Dipylidium caninum, what is the principal host and the intermediate host? 2. In the life cycle of Taenia pisiformis, what is the principal host and the intermediate host? 3. Tapeworms have no digestive tract. How do they obtain the necessary nutrients for life? 4. Explain the life cycle of either D. caninum or T. pisiformis after a gravid proglottid is shed in the feces of the host. 5. Are tapeworms monoecious or dioecious? What is meant when a mature proglottid is described as hermaphroditic? Explain how the eggs in a proglottid are fertilized. 6. Explain the function of the following reproductive structures in a tapeworm: vas deferens vasa efferentia ovary and oviduct yolk gland uterus
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In the life cycle of Dipylidium caninum, the intermediate host is the flea (Ctenocephalides spp.), and the definitive host is the dog or cat. In the life cycle of Taenia pisiformis, the intermediate host is the rabbit, and the definitive host is the dog. Show more…
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Madhur L.
Tapeworms In the life cycle of Taenia pisiformis, what are the principal host and the intermediate host? What are the necessary nutrients that tapeworms obtain for life? Explain how the eggs are fertilized and how the fertilized proglottid is described. Are tapeworms monoecious or dioecious? What happens when they are in the definitive host? Explain the function of the following: reproductive structures, apical organ, and excretory system.
QUESTION 2 What trait defines the clade that contains flatworms, mollusks and annelids and distinguishes it from the clade that contains arthropods and nematodes? triploblastic germ layers spiral cleavage of cells during early embryonic development radial symmetry protostome development bilateral symmetry QUESTION 3 From the list below, identify the environmental variables (i.e., all that apply) in which a person would be most likely to contract schistosomiasis. (Hint: consider the life cycle of the fluke that causes the disease. Create a list of environmental and organismal variables that would be needed for the fluke to complete its life cycle. For more information about schistosomiasis, visit this link: https://en.wikipedia.org/wiki/Schistosomiasis fish present nematode infested mosquito infested snail infested sanitary water (i.e., no animal feces present) unsanitary water (e.g., sewage present) QUESTION 4 In what ways do tapeworms differ from flukes? Select all that apply. tapeworms have segmented proglotids, flukes do not tapeworms lack a digestive tract, flukes do not. tapeworms are parasitic, flukes are not tapeworms are free-living, whereas flukes are parasitic tapeworms are endoparasites whereas most flukes are ectoparasites
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