Question # 1

--------------- is a developmental process that occurs in gastropods and results in a 180 degree counterclockwise twisting of the visceral mass and mantle cavity

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Gastrulation

Epiboly

Involution

Torsion

The diversity of body forms and lifestyles present in the phylum Mollusca is an excellent example of adaptive radiation

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True

False

None of Above

Which of the following is true of the radula of most molluscs?

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It is used in reproduction

It is used in excretion

It is used in rasping food

It is used in gas exchange

A clitellum is present in the members of the class Polychaeta is

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Hirudinea.

Polychaeta.

Oligochaeta.

IIirudinea and Oligochaeta

Acanthocephalans are also known as spiny-headed worms because of their spiny

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True

False

none of the above

Members of which of the following mollusc classes would be characterized by a reduced head, a mantle that surrounds the entire body and a tusk-shaped shell?

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Scaphopoda

Bivalvia

Polyplacophora

Gastropoda

The absence of a shell in the aplacophora is a primitive character in the phylum Mollusca

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True

False

None of Above

The mantle of most mollusks

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is modified for locomotion

is used in attracting prey

secretes the shell

supports the radula

The arrangement of structures in fives around a radial animal is called

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Bilateral symmetry

Radial Symmetry

Pentaradial Symmetry

Asymmetr

Presence of metameric segmentation

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Lumbricus

Daphnia

Arenicola

Both A and C are correct

Subkingdom protozoa consist of --------- separate phyla within the kingdom protista.

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Eight

Six

Five

Seven

Schizogony means

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to emit

to join

to split

None of above

No free living larval forms occur in the annelid subclass(es)

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Hirudinea

IIirudinea and Oligochaeta

Polychaeta

Polychaeta and Oligochaeta

The aschelminthis contain organs for gas exchange and circulation.

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True

False

none of the above

The molluscs are most closely related to the

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Annelids

Enhinoderms

Arthropods.

Chordates

The operculum aids in both respiration and reproduction in gastropods

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True

False

None of Above

Nematodes live in both aquatic and terrestrial environments

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True

False

none of the above

Molluscs can be characterized by:

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Trochophore larvae, and they are deuterostomes.

Planaria larvae, and they are protostomes.

Trochophore larvae and they are protostomes.

Planaria larvae, and they are deuterostomes

Of the following, which is the most recently described pseudocoelomate animal phylum?

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Pariapulida

Acanthocephala

Loricifera

Nematomorpha

Most polychaetes are

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Monoecious.

Dioecious.

Protandric.

Asexual.

The approach which makes hypothesis of geneological relationships among monophyletic groups of organisms is

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evolutionary systematic

Phylogenetic systematic

Numarical taxonomy

Both A and C

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