Here are the answers to fill in your worksheet for Section 25.1 Flatworms.
Details: Three characteristics of flatworms
*(Note: These are the most common traits found in biology textbooks for this section)*
1. They have flattened bodies (dorsoventrally flattened).
2. They are acoelomates (they do not have a body cavity between the gut and the body wall).
3. They have bilateral symmetry (their left side is a mirror image of their right side) and a distinct head region.
Review Vocabulary
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acoelomate: An animal that does not have a fluid-filled body cavity (coelom) between its digestive tract and its outer body wall. Their bodies are solid tissue.
New Vocabulary
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flame cells: Specialized cells in flatworms that remove excess water and waste from the body. They have tiny hairs (cilia) that beat like a flickering flame to push fluids out through tubes.
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ganglion: A cluster or group of nerve cells located in the head of the flatworm. It acts like a simple brain to process information from the eyespots and sensory organs.
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pharynx: A muscular tube in the middle of the flatworm's body that can be extended out of the mouth to suck up food.
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proglottid: One of the many segments that make up the long, ribbon-like body of a tapeworm. Each segment contains both male and female reproductive organs.
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regeneration: The ability of an organism to regrow lost or damaged body parts. For example, if a planarian is cut in half, it can grow into two new worms.
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scolex: The specialized "head" or front end of a tapeworm. It has hooks and suckers that allow the tapeworm to attach itself firmly to the host's intestinal wall.
Parent Tip: Review the logic above to help your child master the concept of the mcgraw hill companies worksheet.
