Phlyum Mollusca (K.3)

Question 1

Protostomes

Answer 1

Organisms that are first formed from the mouth

Question 2

Foot

Answer 2

Structure used for locomotion (movement)

Question 3

Mantle

Answer 3

Tissue that secretes the shell-building material

Question 4

Visceral mass

Answer 4

Internal organs and tissues

Question 5

Radula

Answer 5

“Tongue” of gastropods

Question 6

Gills

Answer 6

Tissue used for gas exchange

Question 7

Shell

Answer 7

Hard protective outer case

Question 8

Open circulatory system

Answer 8

Blood flows freely throughout the body into spaces called sinuses

Question 9

Sinuses

Answer 9

Cavities (sinuses include the chamber at the top of nostrils, openings to the heart and blood sinus in the foot of a clam)

Question 10

Closed circulatory system

Answer 10

Closed loop system, blood isn’t free within a cavity. It remains in the blood vessels and heart at ALL times (I.e. humans)

Question 11

Nephridia

Answer 11

Part of excretory system (expels liquid waste from body cavity to exterior)

Question 12

Statocysts

Answer 12

Balance sensory receptor

Question 13

Ocelli

Answer 13

Simple eye with one lens

Question 14

Siphon

Answer 14

Two part tube that allows bivalves to bring water into their tissues and also remove water with waste from their tissues

Question 15

Diecious

Answer 15

Having two separate sexes

Question 16

Veliger larvae

Answer 16

Free-swimming larvae if many molluscs (have a basic shell and ciliated velum used for locomotion and feeding)
(3rd stage of a molluscs life cycle)

Question 17

Keystone species

Answer 17

Organism that helps define a while ecosystem (without it the ecosystem would be altered or cease to exist)

Question 18

Class Gastropoda

Answer 18

Gastro- stomach
Poda - foot
Stomach foot organism (I.e. single shelled - limpet, snail AND no shell - slug, nudibranchs)

Question 19

Class Bivalvia

Answer 19

Bi - two
Valvia - leaves of a door (hinge?)
(i.e. clams, oysters, scallops, muscles)

Question 20

Intertidal zones

Answer 20

Where ocean meets land between low and high tides

Question 21

Nacre

Answer 21

Smooth hard surface that forms a layer within a shell

Question 22

Broadcasters

Answer 22

Organisms that rely on the environment as a medium for distributing their gametes

Question 23

Class Cephalopoda

Answer 23

Cephalo - head
Poda- foot
Head foot organisms (i.e. octopus, squid, cuttlefish fish)

Question 24

Trochophore larvae

Answer 24

Small, translucent, free-swimming larvae (2nd form after zygote is formed)