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DoL Sect25.1 &25.2
Flatworms and Nematodes
| Question | Answer |
|---|---|
| What type of symmetry do flat worms have | bilateral |
| Flatworms are acoelomate. What does this mean? | flatworms do not have any body carvities |
| What organ do freeliving flatworms extend to release digestive enzymes to begin digestion of food particles? | pharynx |
| What is the head of a tapeworm called? | scolex |
| What are the sections of a tapeworm called? | proglottids |
| What adaptation do tapeworms have that enable them to stay in the intestine tract of their host? | their head region has little hooks to fasten the worm to the digestive tract |
| How do planaria reproduce? | regeneration |
| Flatworms do not have a circulatory system nor a respiratory system. What adaptations do they have to accomplish the functions of those two systems? | Their bodies are thin so diffusion can take care of those functions |
| What adaptation do free living flat worms have to handle excretion of body wastes that Cniderians and Sponges don't have? | they have an excretory system |
| What are two different hosts the parasitic fluke Schistosoma have in their life cycle? | humans and snails |
| How does a person contract a Schistosoma worm? | Burrow into the feet of people wading in water that has the worm |
| Why doesn't a tapeworm have a digestive system? | It doesn't need to digest its food since it lives where there is a ready supply of digested food. |
| What is the common name of nematodes? | roundworm |
| What type of body cavity do nematodes have? | pseudocoelomate |
| What is a pseudocoelom? | Fluid filled body cavity between the mesoderm and endoderm. |
| What adaptation do nematodes have for movement? | their pseudocoelom acts as a hydrostatic skeleton for their muscles to push against |
| What is different about the digestive tract of nematodes versus flatworms? | Nematode digestive tract is one way. There is an entrance at one end and an exit at the other. |
| How do nematodes accomplish moving their nutrients throughout their bodies? | diffusion |
| What disease is called by Trichinella worms? | Trichinosis |
| How does a person contract a hook worm? | going barefoot in warm climates (burrows up through foot) |
| How does a person contract an ascaris worm? | From food that is not washed that contains the soil of subtropical and tropical regions |
| Where do female pinworms lay their eggs? | in the skin around the anus of humans |
| What are two ecological relationships between nematodes and plants? | Some nematodes are parasites of plants Some nematodes are used to control the spread of insect predators of plants |
Created by:
abolvin
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