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Molluscs Essential Questions Intro: Animal Classification K__________________ P__________________ C__________________ O__________________ F__________________ G__________________ S__________________ Animalia (multicellular, heterotrophic organisms; 33 diff. phyla) Mollusca (molluscs = squid, octopus, snails, etc.) 7 different classes 1. What type of organisms make up the phylum Mollusca (Molluscs)? 1. ___________________ 5. ___________________ 2. ___________________ 6. ___________________ 3. ___________________ 7. ___________________ 4. ___________________ 2. Define the following prefixes and suffixes: • Mollis- = __________________ • poly- = __________________ • Scapho- = __________________ • placo- = __________________ • -pod = __________________ • -phora = __________________ • a- = __________________ • Gastro- = __________________ • mono- = _________________ (______) • Cephal- = __________________ 3. How many classes of Molluscs are there? What are they? There are ________ classes. • __________________ • __________________ • __________________ • __________________ • __________________ • __________________. • __________________ 4. What 3 characteristics do most molluscs share? 1. __________________– muscular bag that surrounds _____________and ______________, used to circulate __________________ 2. __________________– muscular foot is used by snails and slugs to __________________, and forms __________________in squid and octopuses 3. __________________– a _____________-like organ with scraping teeth used for _____________ 5. How do molluscs get food? • Most __________________use __________________to scrape or drill for food • Most _____________use a (parrot like) _______ to capture food & then grind it up with their radula • Most __________________ filter their food out of the __________________ 6. What kind of nervous system do molluscs have? • Molluscs have a __________________nervous system with a __________________and nerves • Some molluscs have __________________that only detect light and some, like the octopus, have eyes with __________________, __________________, and __________________. 7. How do molluscs reproduce? • Most molluscs reproduce ________________by releasing sperm and egg into the surrounding water • Once __________________occurs the larvae is carried by the current until large enough to swim on its own (__________________) 8. How many genus of Monoplacophora are there? When were these organisms discovered? • Only 1 genus of _________________ (mono = one, placo = shell, phora = bearing) called ________ • Only discovered in the __________ off the South and Central _________________ coast 9. What are the most distinguishing features of Class Aplacophora (a = without, placo = shell, phora = bearing)? • They have no _________________, _________________, or _________________. 10. What is the single genus of Class Polyplacophora (Poly = many, placo = shell, phora = bearing)? • ________________________ 11. What organisms make up the largest class of Molluscs, Class Gastropoda? • _________________ and _________________! • Gastro = _________________, pod = _________________ • All internal _________________ sit on top of a muscular _________________ 12. What is torsion in gastropods? • Torsion is a _________________ process where the developing snail’s body twists into a loop and brings all of the organs _________________ (mouth, gill, anus) 13. What makes bivalves (Class Bivalvia) different from other molluscs? Bivalves… • have _________________ shells • don’t have a _________________ • don’t have _________________ 14. How does an oyster make a pearl? • Oysters (bivalves) secrete a _____________________ shell lining called “____________________” • If an irritant (like _____________) gets into the bivalve the oyster will deposit this “__________________________” around the irritant to _________________ itself. • Over time _________________ of the deposit are added to form a pearl 15. How are molluscs in class Cephalopod different from the rest of the phylum? • Have _________________ or no _________________ • Have a _________________ (like a _________________) and shred food with _________________ • Muscular _________________ is divided into arms or tentacles • _________________ is used for jet-propulsion • Have _________________ and a _________________ system (they are smart!) 16. How do cephalopods defend themselves? • Ward off attackers with _________________ • _________________ allow them to camouflage • Release ink called _________________ 17. What are the major differences between cuttlefish, squid, and octopus? • Cuttlefish have an internal _________________ used for _________________ control. • Can change depths by _________________ “air-to-liquid” _________________ in their shell • Squid have torpedo-like bodies, 2 _________________ longer than the other 8 _________________ • Octopuses have no _________________ and live in rocky and coral reefs, have _______________ in their beaks, and are very _________________.
