5.1 Mollusks

Match the following.

• clams, oysters, muscles, scallops

• Mollusca

• mollusks

• Cephalopoda

• squid, octopuses, cuttlefish, nautillus

• Bivalvia

• snails and nudibranchs

• Gastropoda

Select the answers that accurately describe mollusks

• has more representative species in the ocean than any other group.

• are found in every marine habitat

• most have a bilaterally symmetric body

• have a coel, or a large body cavity

Match the following

• an organ covered with hundreds of small teeth used for scraping food into a mollusks' mouth

• radula

• used to suck in and expel seawater

• siphons

• a noticeable hump at the location where two shells hinge together

• umbo

• can rapidly change an animals color to match their surroundings

• chromatophores

• a layer of tissue surrounding the organs of a mollusk

• mantle

Which class of mollusks has a coiled up group of organs surrounded by a shell and a crawling foot located on it's ventral side?

• Gastropoda

• Bivalvia

• Cephalopoda

Which class of mollusks is made-up of carnivorous predators with sucker-like tentacles, well-developed sense organs, and relatively large brains?

• Gastropoda

• Bivalvia

• Cephalopoda

Which class of mollusks has a laterally compressed body with a hinged, two-piece shell and large gills?

• Gastropoda

• Bivalvia

• Cephalopoda

Name two ways that octopuses and squid are different from each other.

Named two ways squid and cuttlefish are different from each other.