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Exam 10: Molluscs

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Question 1

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Most cephalopods can secrete and expel an ink containing _____________ to confuse enemies.

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melanin

Question 2

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The class Gastropoda is the most diverse and ecologically the most successful mollusc group.

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B) False

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Question 3

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One group of molluscs in particular,the _____________,serve as intermediate hosts for many harmful parasites.

The circulatory system of cephalopods is more efficient than other molluscs because it is ____________ and has accessory ___________ at the base of each gill.

Chitons have eight plates embedded in their dorsal surface.

Molluscs with a tubular shell,open at both ends are the class _____________.

Opisthobranchs that have no shell or true gill are commonly known as ____________.

The muscles which hold the valves of a bivalve together are the

Molluscs are important to humans because of their important ecological niches,because a variety of them are eaten,and because some kinds produce pearls.

The nudibranchs belong to the

The characteristics that generally typify molluscs are

Most cephalopod molluscs can change colors because of special pigment cells that are called _____________.

The circulatory system of cephalopods is more efficient than that of other molluscs because

The ______________ is the outer layer of a typical mollusc shell.

The pulmonate snails lack gills,and their mantle cavity functions in an analogous fashion to a __________.

Many freshwater clams have specialized,parasitic ___________ larvae.

The mantle cavity in a mollusc houses the gills,foot,and head.

In coelomate animals,the coelom

Locomotion in most of the Bivalvia is accomplished by

Torsion in gastropods caused the mantle cavity and the organs it contained to lie above the _________.