Bio 2.2 Lab Exam 2: Mollusca
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Do mollusks have a complete or incomplete digestive system?
What is a muscular foot?
Used primarily for locomotion.
What is a mantle?
A dorsal membrane that secretes the shell.
What is a radula?
A tough tongue mollusks use for rasping their food.
What class of mollusca are the chitons in?
What class of mollusca are the snails and slugs in?
What symmetry does the class gastropoda have?
Asymmetry, coiled shell.
What class of mollusca are the clams, mussels, and oysters in?
Do members of the class bivalvia have a radula?
How did the the class bivalvia get its name?
Two symmetrical shells enclose the body of the organism.
What class of mollusca are the squids and octopuses in?
What are the four classes of mullusca?
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
What do mussels and clams use to attach themselves to rocks?
- 1: Mantle/Pallial line
- 3: Lateral teeth
- 4: Pseudocardinal teeth
- 5: Digestive Gland
- 6: Anterior adductor muscle
- 7: Posterior adductor muscle
- 8: Gills
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
What is the innermost layer of a clam shell?
What is the middle layer of the clam shell?
What is the outermost layer of the clam shell?
- A: Anus
- B: Excurrent Siphon
- C: Incurrent Siphon
- D: Mantle
- E: Foot
- F: Gill
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.
- A: Ink Sac
- B: Gill
- C: Systemic Heart
- D: Brachial Heart
- E: Ovaries
- F: Pen
- G: Nidamental Glands
- H: Stomach
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