Gastropods & Bivalves

Front

What is the inner, sometimes iridescent layer of a mollusc shell called?

Back

Nacreous layer.

Front

What is the term for the structure in bivalves that is known as the umbo?

Back

Umbo.

Front

What are the structures on both sides of a bivalve that are responsible for closing the shell?

Back

Adductor muscles.

Front

Which muscle do bivalves use to close their shells tightly to keep predators out?

Back

Adductor & abductor muscles.

Front

What is the function of the foot in gastropods?

Back

The foot is used for locomotion.

Front

What is the outermost layer of a mollusc shell called?

Back

Periostracum.

Front

What is the role of the mantle in molluscs?

Back

The mantle secretes the shell and covers the body.

Front

What are siphons in bivalves used for?

Back

Siphons are used for feeding and respiration.

Front

What is the primary function of gills in bivalves?

Back

Gills are used for gas exchange and filter feeding.

Front

What is the difference between gastropods and bivalves?

Back

Gastropods have a single shell or no shell, while bivalves have two shells.