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Name Date Sponges, Cnidarians, and Worms Worms ■ Class Adapted Reading and Study (pages 26–32) Characteristics of Worms (pages 26–27) Key Concept: Biologists classify worms into three major phyla—flatworms, roundworms, and segmented worms. • The three main groups of worms are flatworms, roundworms, and segmented worms. • Worms are invertebrates because they do not have a backbone. Worms have bilateral symmetry. Worms have cells, tissues, organs, and systems. • Worms have a brain and sense organs. • Some worms reproduce sexually. Some worms reproduce asexually. Answer the following questions. Use your textbook and the ideas above. 1. Circle the letter of each sentence that is true about worms. a. There are three main groups of worms. b. Worms have radial symmetry. c. Worms have a brain. 2. Is the following sentence true or false? All worms reproduce asexually. 3. Circle the letter of each term that tells about worms. a. invertebrate b. bilateral symmetry c. vertebrate © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. 14 Name Date Sponges, Cnidarians, and Worms Flatworms ■ Class Adapted Reading and Study (pages 28–29) Key Concept: Flatworms are the simplest group of animals with bilateral symmetry. They are flat, as soft as jelly, and mostly parasitic. • Flatworms are one of the three groups of worms. • Some flatworms are parasites. Parasites live on or in another organism called a host. Parasites take food from the host. Tapeworms are flatworms that are parasites. • Some flatworms are free-living. Free-living organisms do not live on or in a host. Free-living flatworms live in water or wet soil. • Planarians are a kind of flatworm. They are free-living scavengers. Scavengers eat dead or decaying things. Planarians also eat other small animals. Answer the following questions. Use your textbook and the ideas above. 4. Draw a line from each term to its meaning. Term Meaning free-living a. takes food from a host parasite b. eats dead and decaying things c. does not live in or on a host scavenger 5. Circle the letter of the word that tells what a parasite lives on. a. scavenger b. host c. larva 6. Organisms that do not live in or on a host are called . © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. 15 Name Date Sponges, Cnidarians, and Worms Roundworms ■ Class Adapted Reading and Study (page 30) Key Concept: Unlike cnidarians or flatworms, roundworms have a digestive system that is like a tube, open at both ends. • Roundworms are one of the three groups of worms. Roundworms live in many places. • Some roundworms are parasites. Other roundworms are free-living. • Roundworms have a digestive system that is open on both ends. Food goes into the mouth and moves through the body. Waste leaves through the anus, an opening at the other end. Answer the following questions. Use your textbook and the ideas above. 7. Circle the letter of each sentence that is true about roundworms. a. Some roundworms are parasites. b. Roundworms have a digestive system with two openings. c. Roundworms can live in only one place on Earth. 8. Read each word in the box. In the sentences below, fill in the correct words. tube mouth anus Food enters a worm’s body through the . The food moves through the body. Waste leaves the worm’s body through the . © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. 16 Name Date Sponges, Cnidarians, and Worms ■ Class Adapted Reading and Study Segmented Worms (pages 31–32) Key Concept: Segmented worms have bodies made up of many linked sections called segments. • Segmented worms are one of the three groups of worms. Segmented worms have bodies made of many parts joined in a row. Earthworms are one kind of segmented worm. • Segmented worms have a digestive system that is open on both ends. They have a mouth and an anus. • Segmented worms have a closed circulatory system. Blood stays inside tubes in their bodies. • Earthworms make tunnels in soil. The tunnels make the soil better for plants. Earthworm wastes also make soil better for plants. Answer the following questions. Use your textbook and the ideas above. 9. Circle the letter of each sentence that is true about segmented worms. a. Segmented worms do not have a mouth. b. Segmented worms have a closed circulatory system. c. An earthworm is a segmented worm. 10. Look at the pictures. Circle the picture that shows a segmented worm. © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. 17