Marine Bio B Exam Review - Mollusca/Porifera

What type of symmetry do molluscs exhibit?

• Bilateral symmetry

• Asymmetry

• Radial symmetry

• Spherical symmetry

The shells of molluscs are composed of...

• Silica

• Cellulose

• Calcium carbonate

• Silica carbonate

The class of molluscs that are said to be "head-footed" are...

• Gastropods

• Cephalopods

• Bivalves

• Braineopods

Bivalves use their gills to...

• Breathe ONLY

• Filter food ONLY

• Breathe AND filter food

• Bivalves don't have gills

Nudibranchs are also known as...

• Sea snails

• Sea slugs

• Chitons

• Shipworms

Cephalopods have a single large brain; other molluscs have several "local brains" called...

• Ganglia

• Mantles

• Radulas

• Nerve nets

The only cephalopod that doesn't have any kind of shell at all is the...

• Nautilus

• Octopus

• Squid

• Cuttlefish

Which bivalve makes the types of pearls that are used for jewelry?

• Clams

• Oysters

• Mussels

• Scallops

The structure unique to molluscs is a ribbon-like band of teeth called a...

• Radula

• Foot

• Mantle

• Ganglion

The only cephalopod that has an external shell is the...

• Nautilus

• Octopus

• Squid

• Cuttlefish