30 Questions
What is the primary function of the radula in molluscs?
To rasp and scrape for feeding
What is the outermost layer of a mollusc shell?
Periostracum
What is the purpose of the mantle cavity in molluscs?
To contain the respiratory organs
What is the characteristic of the circulatory system in most cephalopods?
Closed circulatory system
What is the name of the free-swimming, ciliated larval stage in molluscs?
Trochophore
What is the function of the nacreous layer in mollusc shells?
To form pearls
What adaptation do derived prosobranchs have to improve respiratory efficiency?
Loss of one gill and half of the remaining gill
What is the function of the pneumostome in pulmonates?
To open to the outside for gas exchange
What is the direction of coiling in shells determined by?
Genetic control
What type of reproductive system is characteristic of most freshwater snails?
Ovoviviparity
What is the primary function of the radula in most gastropods?
Scraping algae off hard surfaces
What is the main difference between planospiral and conispiral shells?
The position of each whorl relative to the others
What is the term for the rotation of the mantle cavity to an anterior position?
Torsion
What is the purpose of the operculum in many snails?
To close off the shell
What is the sense organ found at the base of the incurrent siphon in some gastropods?
Oosphradium
What is the conclusion about the classification of Prosobranchia based on recent evidence?
It is a paraphyletic group
What is the function of ctenidia in many gastropods?
Respiration in the mantle cavity
What is unique about the radula of snails in the genus Conus?
It is modified into a drill for boring through shells
What is the function of the funnel in cephalopods?
To control the direction of swimming
How do cephalopods communicate?
Through visual signals and body language
What is the function of the ink sac in cephalopods?
To defend against predators
What is unique about the circulatory system of cephalopods?
It is a closed circulatory system
What is special about the brain of cephalopods?
It is the largest of any invertebrate
How do cephalopods reproduce?
Sexes are separate and juveniles hatch from eggs
What is the main function of the muscular foot in bivalves?
To extend and move the organism around
What is the purpose of the tiny teeth on the valves of shipworms?
To burrow through wood and create tunnels
What is the main reason why native freshwater clams in the U.S. are jeopardized?
Due to their sensitivity to water quality changes
What is the purpose of the statocysts in the foot of bivalves?
To maintain balance and orientation
What is the function of the osphradia in the mantle cavity of bivalves?
To detect chemical changes in the environment
What is the main purpose of the scallops' row of small blue eyes along the mantle edge?
To detect predators and react to threats
Learn about the internal form and function of prosobranchs and pulmonates, including their respiratory systems, gills, and lungs. Understand the differences between these two types of mollusks.
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