BIS 2C: Mollusks

Question 1

circulatory system

Answer 1

open circulatory system with heart and associated vessels

Question 2

characteristic body plan

Answer 2

mantle, foot and visceral mass

Question 3

mantle

Answer 3

tissue that covers visceral mass. shell secreted by mantle

Question 4

foot

Answer 4

for locomotion or burrowing in bivalves. tentacles/ arms and siphons in cephalopods

Question 5

visceral mass

Answer 5

contains body internal organs

Question 6

chiton modifications

Answer 6

shell plates and repeated gills

Question 7

gastropod modifications

Answer 7

torsion (anus above head)

Question 8

bivalves modification

Answer 8

burrowing foot

Question 9

cephalopods modification

Answer 9

arms/ tentacles and siphon for propulsion

Question 10

reproduction

Answer 10

mostly dioecious, some monecious

Question 11

external fertilization

Answer 11

chitons and bivalves

Question 12

internal fertilization

Answer 12

gastropods and cephalopods

Question 13

stages

Answer 13

trochophore larva to veliger larva to adult

Question 14

land snail and love darts

Answer 14

increase chances of fertilization

Question 15

chitons

Answer 15

polyplacophora

Question 16

chiton features

Answer 16

dorsally flattened. multiple shell plates and multiple gills

Question 17

bivalves

Answer 17

clams, mussels, oysters, scallops

Question 18

bivalve features

Answer 18

shell in two plates, mostly sedentary filter feeders, no radula. food and water brought in through siphon

Question 19

gastropods

Answer 19

snail, slug, sea slugs, conch, nudibranchs

Question 20

gastopod features

Answer 20

shell in one piece, torsion

Question 21

cephalopods

Answer 21

squids, octopus, nautiluses