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z. Biology Exam 3
These are designed to prepare for Exam 3 in a first-semester Organismal Biology course.
38
Biology
Undergraduate 1
04/06/2010

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Term
Dioecious
Definition
separate sexes; individuals are either male or female
Term
Monoecious
Definition
individuals having both sex organs (Hermaphrodite)
Term
Coelomate
Definition
An animal with a true body cavity (coelome).
Term
Acoelomate
Definition
Animals which lack a body cavity.
Term
Pseduocoelomate
Definition
Animals (e.g. nematodes) which have a half-assed body cavity.
Term
Osculum
Definition
opening at top of sponges that filtered water flows out from
Term
ostium (pl. ostia)
Definition
small openings on sponge that water flows in to the sponge from
Term
choanocyte
Definition
flagellated cells which pull water in through the ostia of a sponge
Term
spongocoel
Definition
central cavity of a sponge
Term
Cnidaria
Definition
Animal phylum with radial symmetry, no organs.

Jelly fish, hydras, coral, etc.
Term
Cnidocyte (Nematocyst)
Definition
Stinging cells of cnidarians.
Term
Coloblast
Definition
Fly-paper like strip that hangs down from ctenophores, traps prey.
Term
Sessile
Definition
Immobile, stationary
Term
Medusa
Definition
Floating, mobile form of cnidarians (e.g. jelly fish)
Term
Polyp
Definition
Anchored, sessile form of cnidarians (e.g. anemones, hydras).
Term
Pupa
Definition
transitional stage between larva and adult forms of insects with complete development.
Term
Endothermic
Definition
Body produces its own heat.
Term
Ectothermic
Definition
Heat comes from outside the body (cold-blooded).
Term
Dorsal
Definition
"back" side
Term
Ventral
Definition
"belly" or down-side
Term
Anterior
Definition
towards the head end
Term
Posterior
Definition
towards the tail end
Term
Radula
Definition
scraping tongue of molluscs (although absent in bivalves)
Term
Trochophore
Definition
Ciliated larval form of some mollusks.
Term
Veliger
Definition
Plankton larvae of most gastropod molluscs and bivalves.
Term
Operculum
Definition
Moveable gill covers.
Term
Parapodia
Definition
"legs" of polychaete worms
Term
Water vascular system
Definition
System of internal tubes for hydrovascular skeleton in echinoderms
Term
Bioremediation
Definition
Cleaning up pollution using living organisms.
Term
Pharynx
Definition
cavity behind the mouth, that opens to both digestive and respiratory system
Term
Ecdysis
Definition
shedding (molting) of exoskeleton
Term
Spiracles
Definition
openings of the trachea
Term
Trachea
Definition
air-carrying tube
Term
Tagma (pl. tagmata)
Definition
Specialized groups of segments
Term
Tympanum
Definition
Sound-sensing structure in insects.
Term
Amnion
Definition
protective layer around embryo of terrestrial vertebrates
Term
placenta
Definition
organ in many mammals that provides nourishment to embryo and removes waste
Term
Spicules
Definition
sharp hard boney structures in sponges for support and to deter predators
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