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True or False: Members of the Phylum Mollusca are among the structurally
simplest multicellular organisms.
b. deposit feeders
e. all of the above
Which of the following is NOT a characteristic
trait of molluscs?
a. a radula
b. a shell
c. a muscular foot
e. paired gills
What is the highest level of organization in molluscs?
d. organ system
e. none of the above
True or False? The typical molluscan body plan is greatly modified
in some of the molluscan classes.
Molluscs have which type of symmetry?
b. no symmetry
False, molluscs have organ systems and are structurally
complex; sponges (Phylum Porifera) are among the structurally simplest
e, molluscs have a wide variety of feeding styles,
including carnivory, filter feeding, deposit feeding, and scavenging.
d, molluscs often have a calcium carbonate shell,
a muscular foot for locomotion, a radula
(a ribbon of small teeth used in feeding), and paired gills
to aid in respiration. Although some molluscs have tentacles (such
as octopus), the presence of tentacles is not a diagnostic characteristic
d, molluscs have an organ system level of organization.
true, the typical molluscan body plan is greatly
modified in some of the molluscan classes. For example, squid have
internal shells and octopuses and a few other molluscs have no shell
a, molluscs have bilateral symmetry.