Ch 37 Mollusks and Annelids Quiz

Last Name, First Name

Block

• 1st Block
• 2nd Block
• 3rd Block
• 4th Block

1. The evolution of a coelom was significant because

• A more food could be stored within it
• B more wastes could be stored before excretion
• C it enabled development of more complex organ systems
• D it eliminated the need for a circulatory system

2. Trochophore larvae

• A are found in molluscan life cycles
• B possess a belt of cilia around their bodies
• C occur in annelid life cycles
• D All of the above

3. A characteristic structure found in many mollusks is the radula, which is involved in

• A jet propulsion
• B opening and closing of the shells
• C eating
• D reproduction

4. The only mollusks that have a closed circulatory system are

• A bivalves.
• B cephalopods.
• C chitons.
• D gastropods

5. Refer to the illustration above. The organism shown in this diagram is a

• A bivalve.
• B cephalopod.
• C chiton
• D gastropod.

6 Refer to the illustration above. Movement of this organism is dependent upon the structure labeled

• A "1"
• B "2"
• C "3"
• D None of the above

7. Adductor muscles are responsible for

• A moving the valves of bivalves
• B extending the feet of mollusks
• C pumping the hearts of mollusks
• D fanning the gills of aquatic mollusks

8. Twisting of the visceral mass of gastropods is called

• A extension
• B inversion.
• C torsion
• D conversion