High Invertebrates Test Review

The molluscs:

• do not have a larvae stage.

• lack a digestive system.

• have bodies divided into segments.

• make a chitinous shell.

• possess a soft body covered with a mantle.

Which are NOT paired correctly?

• Gastropoda - snail

• Cephalopoda - squid

• Bivalvia - mussels

• Gastropoda - clams

• Bivalvia - scallops

The visceral mass of molluscs does NOT contain the

• circulatory system.

• excretory system.

• nervous system.

• head-foot.

• digestive system.

The digestive system of molluscs is found in the:

• head.

• foot.

• mantle.

• visceral mass.

• mantle cavity.

The structure used for secreting the shell of many molluscs is called the:

• foot.

• visceral mass.

• mantle.

• tentacles.

• radula.

The radula functions to:

• filter feed.

• assist in reproduction.

• scrape algae off of rocks.

• assist in osmoregulation.

• secrete the shell.

The outer layer of the molluscan shell is called the ___ layer.

• foot

• collagen

• nacreous

• prismatic

• periostracum

The molluscan shell does not contain the:

• periostracum.

• prismatic layer.

• nacreous layer.

• mantle.

Molluscs with a tubular shell and sheath foot are:

• scaphopods.

• gastropods.

• bivalves.

• cephalopods.

• nudibranchs.

Animals covered by eight overlapping shells on their dorsal surface are

• chitons.

• octopuses.

• shrimp.

• crabs.

• lobsters.