Phylum Mollusca
Class Bivalvia
Form and Function
Visceral Mass
Class Cephalopoda
100
Most molluscs are freshwater aquatic or marine
What is marine ?
100
Invertebrates with two valves or shells are also members of this class
What is Pelecypoda?
100
Incurrent and excurrent openings are also known as these
What are the siphons?
100
This is a sheath of skin on each side of the body that secretes the shell
What is the mantle?
100
The sense organs of a cephalopod are located in this region
What is the head?
200
These molluscs evolved to become relatively intelligent
What are cephalopods?
200
Most Bivalves obtain their food through this method
What is filter feeding?
200
The cluster of connected nerves that help to direct the body functions of a mollusc
What is a ganglia?
200
This is the function of the exposed surface of the mantle
What is the exchange of gases?
200
The nautilus shell is divided into these regions?
What are chambers?
300
This part of a molluscs anatomy contains the feeding, cephalic sensory and locomotor organs
What is the head-foot portion?
300
Bivalves are held together using these muscles
What are abductor muscles?
300
Mollusca Embryo develop in this form
What is a trochophore?
300
Products of the digestive, excretory and reproductive systems emty into this region?
What is the mantle cavity?
300
Most cephalopods contain this type of circulatory system with a heart, vessels, and capillaries
What is a closed system?
400
This portion of the mollusc contains digestive, circulatory, respiratory, and reproductive organs
What is the visceral mass?
400
This is the oldest part of the bivalve shell?
What is the umbo?
400
This structure in molluscs is a textured tongue-like organ
What is a radula?
400
These molluscs use their head and mantle cavity to creat jet propulsion
What are cephalopods?
400
Shell coiling will produce this type of shell
What is a Nautilus shell?
500
Molluscs that have male and female gonads within separate individuals
What is diocious?
500
Gaseous exchange in bivalves takes palce in these organs?
What are the mantle and gills?
500
These two characteristics are used to classify molluscs
What are the pattern and mumber of teeth?
500
Concurrent blood movement in the gills absorb this gas
What is oxygen?
500
Cephalods like the squid and octopuses are known as this type of feeder
What is a marine predator?
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