Question # 1

The mantle of most mollusks

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is modified for locomotion

is used in attracting prey

secretes the shell

supports the radula

--------------- 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

Cephalopods rely on olfactory senses for detecting prey

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True

False

None of above

Which of the following is true of the visceral mass of a mollusc?

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It contains the gills

It secretes the shell

It is used in locomotion

It contains gonads and digestive glands

All of the following mollusc characters would be found in a member of the class Bivalvia except one. Select the exception.

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Visceral mass

head-foot

mantle cavity

radula

The molluscs are most closely related to the

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Annelids

Enhinoderms

Arthropods.

Chordates

Which one of the following do not lie in phylum Cnidaria?

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obelia

aurelia

Actinia

Taenia

The scientific name of the common pinworm is

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Ascaris lumbricoides.

Enterobius vermicularis

Trichinella spiralis.

Wuchereria bancrofti

Which of the following is not a common feature of aschelminth?

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incomplete digestive tract

a muscular pharynx

constant cell numbers (eutely)

adhesive glands

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

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Bilateral symmetry

Radial Symmetry

Pentaradial Symmetry

Asymmetr

Animals of phylum cnidaria are

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Diploblastic

Triploblastic

None of above

Water exits the mantle cavity of a bivalve through the ------------ and the excurrent opening

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water tube

incurrent opening

suprabranchial chamber

pericardial cavity

The majority of rotifers inhabit freshwaters

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True

False

none of the above

--------------- are the characters that have arisen since common ancestory with the group

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Homologous characters

Derived characters

Synapomorphies

Both B and C

Which of the following phyla are not pseudocoelomate?

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Acanthocephala

Rotifera

Polychaeta

Nematoda

Animals of phylum cnidaria can be found in

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Aquatic environment

Marine environment

Dry and harsh environment

Both A and B are correct

The operculum aids in both respiration and reproduction in gastropods

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True

False

None of Above

The ------------- is a site of amino acid metabolism in an earthworm and is analogous to the vertebrate liver.

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Typhlosole

Seminal vesicle

Nephridium

Chloragogen tissue

Presence of metameric segmentation

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Lumbricus

Daphnia

Arenicola

Both A and C are correct

Elephantiasis is caused by filarial worms (i.e., Wuchereia spp.).

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True

False

none of the above

Intermediate host for fish tape worm is

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Pig

Copepod

Snail

Humans

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