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Chapter 13.1 & 13.2 Mollusks & Annelids Reading Guide (pp. 364-389) Name _____________________ Hour ____ Part 1 – Mollusks – pp. 364-368 1. Fill in this chart about mollusks: Characteristics of Mollusks – What makes a mollusk a mollusk? Examples of Mollusks 2. Define these terms from the reading – do not use the glossary in the back of the book: Mantle: _______________________________________________________________ ____________________________________________________________________ Gills: ________________________________________________________________ ____________________________________________________________________ Open circulatory system: _________________________________________________ ____________________________________________________________________ 3. Fill in this diagram about the three groups of Mollusks. What is true only about Bivalves? What is true only about Gastropods? What do all three have in common? 4. How are Mollusks beneficial (helpful) to humans? ____ _________________________________________ _________________________________________ _________________________________________ What is true only about Cephalopods? _________________________________________ 5. How can Mollusks “cause problems” for humans? _____ _____________________________________________________________________ _____________________________________________________________________ Part 2 – Segmented Worms (Annelids) – pp. 369-373 1. What does the word “annelid” mean? _________________________________________ 2. Why are these worms given this name? _______________________________________ ____________________________________________________________________ 3. Complete this chart about annelids: What type of symmetry? How many body openings? Where are they found? Examples of annelids: 4. What are setae? _______________________________________________________ ____________________________________________________________________ What are they used for? __________________________________________________ ____________________________________________________________________ How many setae are on each segment? ________________________________________ 5. Digestion and Excretion: Describe the unique way that earthworms take in food: ________ ____________________________________________________________________ List 5 parts of the earthworm digestive system (think of the path the food moves through from beginning to end): ___________________________________________________ ____________________________________________________________________ What are castings and why are they useful? ____________________________________ ____________________________________________________________________ 6. Circulation and Respiration: What is the purpose of the aortic arches? ________________ ____________________________________________________________________ How do earthworms “breathe?” _____________________________________________ ____________________________________________________________________ ____________________________________________________________________ 7. Nerve Response and Reproduction: Can an earthworm fertilize itself? Why or why not? ___ ____________________________________________________________________ ____________________________________________________________________ 8. Read and look at the pictures of the unusual marine worms on p. 371 – List 4 interesting things about these worms: ________________________________________________ ____________________________________________________________________ ____________________________________________________________________ 9. Why don’t you feel a leech when it is biting you? ________________________________ ____________________________________________________________________ ____________________________________________________________________ 10. Why have leeches been used for medicine? How are they helpful? ___________________ ____________________________________________________________________ ____________________________________________________________________ 11. How are annelids helpful to humans? _________________________________________ ____________________________________________________________________ ____________________________________________________________________
