Some bivalves have an operculum which prevents drying when the tide goes out.
Multiple Choice Questions
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Q12: Molluscs are important to humans because of
Q13: Molluscs evolved in fresh water,and therefore the
Q14: The Solenogasters
A)live on the sea bottom and
Q15: The characteristics that generally typify molluscs are
A)foot,mantle,protonephridia,shell.
B)radula,open
Q16: The Monoplacophora
A)lack a shell.
B)live in fresh water.
C)have
Q18: Locomotion in most of the Bivalvia is
Q19: Chitons have eight plates embedded in their
Q20: The nudibranchs belong to the
A)ProsobranchiA.
B)Opisthobranchia.
C)Pulmonata.
D)Scaphopoda.
Q21: Though they evolved from a torted ancestor,opisthobranchs
Q22: The empty chambers of Nautilus are connected
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