Bio 2.2 Lab Exam 2: Mollusca

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pugluv01
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Bio 2.2 Lab Exam 2: Mollusca
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2013-02-24 21:12:26
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Lab Exam 2
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  1. Do mollusks have a complete or incomplete digestive system?
    Complete
  2. What is a muscular foot?
    Used primarily for locomotion.
  3. What is a mantle?
    A dorsal membrane that secretes the shell.
  4. What is a radula?
    A tough tongue mollusks use for rasping their food.
  5. What class of mollusca are the chitons in?
    Polyplacophora
  6. What class of mollusca are the snails and slugs in?
    Gastropoda
  7. What symmetry does the class gastropoda have?
    Asymmetry, coiled shell.
  8. What class of mollusca are the clams, mussels, and oysters in?
    Bivalvia
  9. Do members of the class bivalvia have a radula?
    No
  10. How did the the class bivalvia get its name?
    Two symmetrical shells enclose the body of the organism.
  11. What class of mollusca are the squids and octopuses in?
    Cephalopoda
  12. What are the four classes of mullusca?
    • Polyplacophora
    • Gastropoda
    • Bivalvia
    • Cephalopoda
  13. What path does air take for a land snail?
    It enters through the pneumostome and passes through a respiratory chamber (lung).
    • A: Foot
    • B: Pneumostome, used for air intake
    • C & D: Tentacles
  14. What do mussels and clams use to attach themselves to rocks?
    Byssal threads


  15. 1?
    3?
    4?
    5?
    6?
    7?
    8?
    • 1: Mantle/Pallial line
    • 3: Lateral teeth
    • 4: Pseudocardinal teeth
    • 5: Digestive Gland
    • 6: Anterior adductor muscle
    • 7: Posterior adductor muscle
    • 8: Gills
  16. What are the three layers on a clam shell?
    • Nacreous layer: innermost
    • Prismatic layer: strongest middle layer; made of calcium carbonate
    • Periostracum: outermost layer; waterproof; protective
  17. What is the innermost layer of a clam shell?
    Nacreous layer
  18. What is the middle layer of the clam shell?
    Prismatic layer
  19. What is the outermost layer of the clam shell?
    Periostracum


  20. A?
    B?
    C?
    D?
    E?
    F?
    • A: Anus
    • B: Excurrent Siphon
    • C: Incurrent Siphon
    • D: Mantle
    • E: Foot
    • F: Gill
  21. Do mollusks have an open or closed circulatory system and how does it work?
    Open, hemolymph is a fluid that is pumped through the heart and bathes the organs through cavities called hemocoels.


  22. A?
    B?
    C?
    D?
    E?
    F?
    G?
    H?
    • A: Ink Sac
    • B: Gill
    • C: Systemic Heart
    • D: Brachial Heart
    • E: Ovaries
    • F: Pen
    • G: Nidamental Glands
    • H: Stomach

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