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Name_____KEY_____________ HHHCP______________________________ Study Guide: Mollusks Ch 12: Molluscs 1. To whom are the mollusks thought to be more closely related, the annelids or the arthropods? _____ANNELIDS___________ 2. List 5 additional major body features the mollusks possess in addition to a radula: i. radula ii.______COELOM________ iii._____HEAD-FOOT_________________ iv.____VISCERAL MASS_________________________ v.______MANTLE___________________________ vi._____MANTLE CAVITY___________________________ 3. To which group of mollusks do the snails and slugs belong?___CLASS GASTROPODA_________ 4. Name 4 members of Class Bivalvia i.___CLAMS______________________ ii.__OYSTERS____________ iii.__MUSSELS_______________________ iv,.__SCALLOPS______________________ 5. Which class of mollusks contains the octopuses, squids, cuttlefish, and nautiluses? ____CLASS CEPHALOPODA___________ 6. What are the two body parts characteristic of Phylum Mollusca ____HEAD-FOOT_________________ ____VISCERAL MASS_______________________ 7. What organ secretes the calcareous shell of the mollusks? _____MANTLE__________________________________________ 8. What are the functions of the mantle cavity? ____EXCRETION, GAS EXCHANGE, ELIMINATION OF DIGESTIVE WASTES, RELEASE OF REPRODUCTIVE PRODUCTS__________________________ 9. What type of body symmetry do mollusks have?______BILATERAL_________________ 10. Which part of the mollusk body contains the organs of digestion, circulation, reproduction, and excretion?_____VISCERAL MASS____________________ 11. The mouth of most mollusks contains a rasping structure called a ___RADULA___________ 12. Which is the largest mollusk class?____CLASS GASTROPODA (35,000 SPECIES)__________________- 13. What special developmental adaptation causes the body of gastropods to twist, positioning the excretory and reproductive organs behind the head and causing the digestive tract to take on a Ushape?___TORSION___________________14. What muscles do Bivalves use to open and close their shell?____ADDUCTOR MUSCLES________ 15. Which class of mollusks does not have an open circulatory system?___CLASS CEPHALOPODA____ 16. What is the term for the form of Bivalve larvae that are parasitic on fishes? ____GLOCHIDIUM__________ 17. What method do Cephalopods use for locomotion?_____USE SIPHON FOR WATER-JET PROPULSION____________ 18. How do most cephalopods locate and capture their prey? _LOCATE PREY BY SIGHT AND THEN CAPTURE PREY WITH THEIR TENTACLES_________________ 19. Where is the ink gland of cephalopods located and what is its purpose? __THE INK GLAND IS LOCATED JUST BEHIND THE ANUS. IT’S PURPOSE IS TO SPRAY A CLOUD OF INK WHICH WILL CONFUSE A PREDATOR __________
