Worms and Mollusks

Question 1

Ganglia

Answer 1

: nerve cell clusters that act as a simple brain in worms

Question 2

Coelom

Answer 2

: fluid filled space in worms that keeps the digestive tract separated from the skin

Question 3

Parapodia

Answer 3

: lateral appendages extending from the body segments of worms.

Question 4

Setae

Answer 4

: A stiff hair, bristle, or bristlelike process or part on an organism

Question 5

Nephridia

Answer 5

: an invertebrate organ which occurs in pairs and function similar to kidneys to remove metabolic wastes from an animal’s body.

Question 6

Proboscis

Answer 6

: an elongated appendage from the head of an animal typically used for feeding and sucking. (Ribbon worms have them.)

Question 7

Papillae

Answer 7

: Sensory projections on bristle worms

Question 8

Hirudin

Answer 8

: the anticoagulant secreted by leeches into the wound they create to prevent clotting.

Question 9

Annelids

Answer 9

-Phylum of segmented Worms

Question 10

Nematodes

Answer 10

-Phylum of Round Worms

Question 11

Somites

Answer 11

segments on the annelids

Question 12

Mollusks

Answer 12

• soft-bodied invertebrate animal that is characterized by an internal or external shell,a foot, a mantle, and visceral mass; members of phylum Mollusca

Question 13

Bivalve

Answer 13

• mollusk that lives within a shell made of two sections that are hinged together

Question 14

Foot

Answer 14

• muscular structure in mollusks that usually contains the mouth and other feeding structures

Question 15

Siphon

Answer 15

-a long tube-like structure that is present in certain aquatic mollusks; Used for locomotion and feeding

Question 16

Gastropod

Answer 16

• mollusk that moves by mean of a broad, muscular foot located on its ventral side; usually has one-piece shell for protection

Question 17

Radula

Answer 17

• in some mollusks, layer of flexible skin with hundreds of tiny teeth used for feeding

Question 18

Shell

Answer 18

• structure in mollusks made by glands in the mantle that secrete calcium carbonate

Question 19

Visceral Mass

Answer 19

• structure in mollusks that contains the internal organs

Question 20

Cephalopod

Answer 20

• marine mollusk whose head is attached to its foot, which is divided into tentacles

Question 21

Chromatophores

Answer 21

• pigment that contains light-reflecting cells, aids in camouflage

Question 22

Gill

Answer 22

• filamentous respiratory structure in an aquatic animal

Question 23

Mantle

Answer 23

• thin, delicate layer of tissue that covers most of a mollusk’s body and secretes the shell when one is present

Question 24

Nacre

Answer 24

-also known as mother of pearl, is a composite material produced by some mollusks as an inner shell layer; transparent crystalline substance of which pearls are composed