Phylum Mollusca

Mollusks are acoelomates. 

• True
• False

Mollusks can be aquatic or terrestrial. 

• True
• False

Which of these is NOT one of the three main body parts of a mollusk? 

• Head
• Valve
• Foot
• Visceral Mass

What is the radula used for?

• Locomotion
• Feeding
• Swimming
• Digging

The protective membrane that surrounds the visceral mass on all mollusks is called...

• Radula
• Mantle
• Nephridia
• Visceral Shield 

The protective shell of a mollusk...

• is secreted by the mantle.
• Grows from the end of the mollusk foot. 
• Is constantly replaced by bigger shells as the mollusk grows. 
• forms when the mollusk reaches adulthood. 

All mollusks have an external shell.

• True
• False

Which of the following is NOT a reason that some mollusks move slowly? 

• They have a heavy shell. 
• They have a closed circulatory system.
• They have an open circulatory system.
• Their muscular foot is not well adapted for speed. 

Which of the following is not a potential organ that a mollusk could use for respiration? 

• Ctenidia
• Simple lung
• Mantle 
• Nephridia

Which of the following is NOT true regarding the bulging portion of a bivalve shell? 

• This is where the muscular foot emerges from. 
• This is where the hinge is located. 
• This is the oldest part of the shell. 
• This is called the umbo.