Lesson 22 Terms

Question 1

Adductor muscles

Answer 1

strong muscles holding the shells together

Question 2

Bivalves eat how?

Answer 2

suspension feeders, filtering water and feeding on food suspended in water

Question 3

Cephalopods

Answer 3

A member of a group of molluscs that include squids and octopus

Question 4

Cilia

Answer 4

hair like extensions on the gills move the food to the mouth opening where it’s ingested

Question 5

Closed circulatory system

Answer 5

a) Blood vessels that move blood through their body
b) Two branchial hearts which move the deoxygenated blood to the gills
Or
c) One systemic heart which pumps the oxygenated blood throughout the body

Question 6

Excurrent siphon

Answer 6

area where water leaves the bivalve’s body

Question 7

Gastropods

Answer 7

snails and slugs

Question 8

Hinge teeth

Answer 8

Interlock to prevent valves from sliding sideways when closed

Question 9

Incurrent siphon (function)

Answer 9

moves water into the cavity to the gills where oxygen and carbon dioxide are exchanged

Question 10

Mantle

Answer 10

an outer body wall covering the visceral hump

Question 11

Marine

Answer 11

of or relating to the sea

Question 12

Muscular foot (mollusks)

Answer 12

found inside the shells and used for movement

Question 13

Nacre

Answer 13

secreted in thin layers coating irritants or parasites inside the shell, creating a pearl over time

Question 14

Nacre

Answer 14

secreted in thin layers coating irritants or parasites inside the shell, creating a pearl over time

Question 15

Open circulatory system

Answer 15

with a heart but no blood vessels

Question 16

Radula

Answer 16

rough, tongue-like organ used to scrape food into their mouth and carry it to the digestive tract

Question 17

Sessile

Answer 17

fixed in one place; immobile

Question 18

Suspension feeders

Answer 18

bivalves; filtering water and feeding on food suspended in water

Question 19

Tentacles

Answer 19

long arm-like limbs with suction cups, like on an octopus

Question 20

Umbo

Answer 20

the small bulge on the two shells near the hinge

Question 21

Visceral mass

Answer 21

located between the two sides of the mantle and contains most of the organism’s organs