5. The concentric rings on the shells of mollusks are referred to as growth rings. Which part of the shell do you suppose forms first? (i.e. which is the oldest section of the shell?) 6. Which part of the shell corresponds to its orientation? 7. What is the process in which pearls are made? 8. Briefly describe the function of the: a. Mantle b. Adductor muscles c. Foot d. Gills e. Visceral mass 9. What determines the direction of the shell coiling? 10. When a snail is crawling about, what parts of its body are outside the confines of the shell? 11. What is the operculum? 12. Does the operculum completely seal of the snail's body from its surroundings when the animal is disturbed? Is the operculum continuous with the shell itself? 13. Snails and slugs tend to leave a slime trail when moving around. What is the Purpose of this 14. How is the mantle of a squid different than that if a clam?
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Describe the mollusc body plan: Make a table that compares and contrasts the molluscan features; head, shell, mantle, foot in the five classes of molluscs you studied in lab. Describe how the foot is adapted for locomotion in a: 3. What is a radula used for? 4. Which group of mollusks has a closed circulatory system?
Sri K.
1. What does the term bivalve mean? What is the umbo? How do the rings on the shell form? What can we determine from the series of rings? 2. How are the shells of the clam held together? Explain how to pry open the shells of the clam. 3. Name the fleshy membrane that lines the inside of the shell. What is its function? How does the clam produce a pearl? 4. How can you recognize the gills? What is their function? What is the importance of the large surface area of the gills? 5. What type of feeding do clams have? Explain what this term means. How do the gills help in this process? 6. Describe the foot and give its function. 7. What are labial palps? What are they for? 8. What is the visceral mass? Identify the structures that are visible in a dissected visceral mass. What is the greenish structure? What is its function? What is the yellowish material? Describe the intestines. 9. What kind of circulatory system do clams have? Describe it. Compare it to the type of system we have. Where is the heart located? What structure passes through the cavity in which the heart is found? 10. Was a brain visible in the dissection? Describe the nervous system of the clam. (use the study guide)
Adi S.
Identify which of the following are found in gastropods only; bivalves only; both groups of mollusks using the following key: G Gastropods B Bivalves B/G Both gastropods and bivalves One-piece univalve Two-piece shell (bivalve) Apex; as the animal grows the successive whorls increase in size Muscular foot for locomotion Hump or umbo at the anterior end of the dorsal side of each shell valve Head, characterized by presence of two tentacles each with an eye and radula for rasping Presence of adductor muscles to hold shell together No head and radula
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