Final Review: Worms, Gastropods, Bivalves

The inner, sometimes iridescent layer of a mollusc shell is called the ______ layer.

• prismatic

• nacreous

• periostracum

• mantle

Molluscs are able to extend their body structures, like tentacles, because of their

• opposing muscle groups
• tendons & ligaments
• muscles attached to bones
• hydraulic skeleton

What type of symmetry do Molluscs have?

• Asymmetrical
• Bilateral
• Radial

What is the meaning of Gastropod?

• Soft-bodied
• Stomach foot
• Head-footed
• Two-shelled

What structure has teeth and is used by gastropods to eat?

• Tentacles
• Radula
• Mantle
• Filter feeder

How do Bivalves eat?

• Filter feeders

• Radula

• Tentacles

• Beak

Which part of the Mollusc body contains organs?

• Foot
• Visceral Mass
• Trochophore
• Mantle

Which part of the Mollusk body is the tissue covering the body and secretes the shell?

• Mantle
• Trochophore
• Foot
• Visceral Mass

The oldest and thickest part of the bivalve shell is called the

• periostracum
• operculum
• umbo
• valve

What type of gastropod is pictured? 

• tulip snail
• cowry snail
• abalone
• nudibranch