BIO182 Exam 3, Ch 33

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This set is a work in progress. Questions will be added as we progress through the class.

Sponge "eating"...

water is drawn in through pores into a cavity called the spongocoel, and out through opening called osculum

Body plan of a cnidarian

sac w/ central digestive compartment = gastrovascular cavity, which serves as a hydrostatic skeleton

Turbellaria

(mostly free-living flatworms), generally non-parasitic

Rotifers reproduce...

by parthenogenesis; females produce offspring by unfertilized eggs

Members of class polychaetes have..

paddle-like parapodia that work as gills and aid in locomotion

Millipedes have...

Many legs. Each trunk segment has two pairs of legs.

Echinoderms have a unique..

water vascular system, a network of hydraulic canals branching into tube feet that function in locomotion, feeding, and gas exchange.

A radially symmetrical animal that has two embryonic tissue layers probably belongs to which phylum?

Cnidera

Which cells in a sponge are primarily responsible for trapping and removing food particles from circulating water?

Choanocytes

Corals are most closely related to which group?

sea anemones

What would be the most effective method of reducing the incidence of blood flukes in a human population?

Reduce the freshwater snail population

A lophophore is used by ectoprocts and brachiopods for...

feeding

A terrestrial mollusc without a shell belongs to which class?

gastropods

Which molluscan class includes marine organisms whose shell consists of eight plates?

chitons

Many of these annelids are parasites

Hirudinea (leeches)

Of the annelid classes below, which make castings that are agriculturally important

Oligochaeta

Some species of this annelid class release an anticoagulant that is of medical significance?

Hirudinea (leeches)

A characteristic of nematodes

Only have longitudinal muscles

Humans most frequently acquire trichinosis by

eating undercooked pork

Infection with which parasite might cause excessive elasticity in human skeletal muscles

trichinella worms

Which of the following are entirely, or partly, composed of calcium carbonate?

coral animals' exoskeletons

Among the invertebrate phyla, phylum Arthropoda is unique in possessing members that have

wings

Which of the following characteristics most likely explains why insects are so successful at dispersing to distant environments?

wings

The possession of two pairs of antennae is a characteristic of

crustaceans

Protostomes that have an open circulatory system and an exoskeleton of chitin are part of which phylum?

Arthropoda

Protostomes with a unique drape of tissue that may secrete a shell are part of which phylum?

Mollusca

Deuterostomes that have an endoskeleton are part of which phylum?

Echinodermata

Protostomes that have a closed circulatory system and obvious segmentation are part of which phylum

Annelida

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