Chapter 21

Question 1

What is the largest group of water animals on earth

Answer 1

Mollusks

Question 2

What are mollusks distinguished by

Answer 2

Foot, visceral hump, mantle

Question 3

Examples of bivalves

Answer 3

Clam, muscle, oyster

Question 4

Examples of Gastropods/ univalves

Answer 4

Snail slug whelk

Question 5

Examples of Cephalopods

Answer 5

Squid octopus cuttlefish

Question 6

Definition of bivalve

Answer 6

Two shells (valves)

Question 7

Shellfish are bivalves and they secrete what to make pearls

Answer 7

Nacre

Question 8

What is thin sheets of nacre fused into a ball

Answer 8

Pearl

Question 9

The two shells of a bivalve are held together by what

Answer 9

Adductor muscles

Question 10

Bivalves have what kind of circulatory system

Answer 10

Open

Question 11

Bivalves reproduce through internal or external fertilizeation

Answer 11

External

Question 12

What is the open chamber where the gills are located

Answer 12

Mantle cavity

Question 13

What means right handed in terms of shell structure of univalves

Answer 13

Dextral

Question 14

What are Marine slugs

Answer 14

Nudibranchs

Question 15

What is the rough file like organ that is in the mouths of most univalves

Answer 15

Radula

Question 16

What is a torpedo shaped cephalopod known for its ability to move by jet propulsion

Answer 16

Squid

Question 17

Examples of echinoderms

Answer 17

Star fish sea urchins sand dollars sea cucumbers

Question 18

Most echinoderms have what that rays or arms protrude from

Answer 18

Central disk