Chapter 28.1

Question 1

What type of body cavity do mollusks have?

Answer 1

Coelomates

Question 2

What kind of body plan do mollusks have?

Answer 2

3-part

Question 3

What kind of symmetry do mollusks have?

Answer 3

Bilateral

Question 4

What outer covering do most mollusks have?

Answer 4

Shell

Question 5

What are the three parts that make up the basic mollusk body plan?

Answer 5

Visceral mass, mantle, foot

Question 6

What is the visceral mass?

Answer 6

The central section of the mollusk’s body that contains its organs

Question 7

What is the mantle?

Answer 7

A heavy fold of tissue that forms the outer layer of the body and secretes the mollusk’s shell

Question 8

What is the foot used for?

Answer 8

Locomotion

Question 9

What is the radula and what type of mollusks lack it?

Answer 9

A tongue-like organ covered with thousands of pointed curving teeth used for feeding-bivalves

Question 10

What phylum are mollusks in?

Answer 10

Mollusca

Question 11

What does the coelom of mollusks contain?

Answer 11

Body fluids that are full of waste

Question 12

What do nephridia do?

Answer 12

Recover useful materials such as sugars and salts

Question 13

Where does the waste fluid of a mollusk exit?

Answer 13

Through a pore that opens into the mantle cavity

Question 14

How many chambers do mollusks have in their hearts?

Answer 14

3

Question 15

What type of circulatory system do mollusks have?

Answer 15

Open except for octupuses

Question 16

What is the name for the “blood” of mollusks?

Answer 16

Nemolymph

Question 17

How do mollusks respire?

Answer 17

With gills located in the mantle cavity

Question 18

How are mollusks gendered?

Answer 18

Separate male and female

Question 19

Where does the fertilization of eggs occur?

Answer 19

Externally in aquatic mollusks, internally in terrestrial mollusks and in octopuses

Question 20

What do the fertilized eggs of aquatic mollusks develop into and how does it move?

Answer 20

Trochophore, belt of cilia

Question 21

What are the three major classes of mollusks?

Answer 21

Gastropoda-snails and slugs

Bivalvia-clams, oysters and scallops

Cephalopoda-octopuses and squids

Question 22

What are the three characteristics of gastropods?

Answer 22

Single shell, pair of tentacles, eyes on tips of tentacles

Question 23

How do gastropods move?

Answer 23

With their foot on mucus

Question 24

How do gastropods get food?

Answer 24

Herbivores/active predators

Question 25

What are four examples of cephalopods?

Answer 25

Squid, octopus, cuttlefish, nautilus

Question 26

What makes up the main part of cephalopods and what do they have?

Answer 26

Tentacles, suction cups or hooks

Question 27

How do cephalopods get their food and what do they lack?

Answer 27

Hunting,shell

Question 28

What advantage do cephalopods have that gives them their intelligence?

Answer 28

Well-developed brain

Question 29

How do cephalopods move?

Answer 29

Squirt water through their siphon

Question 30

What type of shell do bivalves have?

Answer 30

2-part, hinged

Question 31

What part do bivalves lack?

Answer 31

Radula

Question 32

How do bivalves feed?

Answer 32

Filter feeders through their gills

Question 33

What do the adductor muscles do?

Answer 33

Open and close the shells of bivalves

Question 34

What substance forms pearls?

Answer 34

Nacre