Section 27 Vocab

Question 1

Acoelomate

Answer 1

Animal lacking a coelom, or body cavity

Question 2

Pharynx

Answer 2

Muscular tube at the end of the gastrovascular cavity, or throat, that connects the mouth with the rest of the digestive tract and serves as a passageway for air and food

Question 3

Flame cell

Answer 3

Specialized cell that filters and removes excess water from the body of a flatworm

Question 4

Ganglion

Answer 4

Group of nerve cells

Question 5

Eyespot

Answer 5

Group of cells that can detect changes in the amount of light in the envoirment

Question 6

Hermaphrodite

Answer 6

Individual that has both male and female reproductive organs

Question 7

Fission

Answer 7

Form of asexual reproduction in which an organism splits into two, and each half grows new parts to become a complete organism

Question 8

Scolex

Answer 8

Head of an adult tapeworm; can contain suckers or hooks

Question 9

Proglottid

Answer 9

One of the segments that make up most of a tapeworms body

Question 10

Testis

Answer 10

Male reproductive organs that produces sperm

Question 11

Pseudocoelom

Answer 11

Body cavity between the endoderm and mesoderm tissues that is partially lined with mesoderm tissue

Question 12

Anus

Answer 12

Opening through which wastes leave the digestive tract

Question 13

Septum

Answer 13

Internal wall between the segments of an annelids body

Question 14

Crop

Answer 14

In earthworms, part of the digestive system in which food can be stored; in birds, structure at the lower end of the esophagus in which food is stored and moistened

Question 15

Closed circulatory system

Answer 15

System in which blood is contained within a network of blood vessels

Question 16

Seta

Answer 16

Bristle attached to the segments of many annelids

Question 17

Gizzard

Answer 17

In earthworms, part of the digestive system in which food is ground into smaller pieces; in birds a muscular organ that helps mechanical break down of food

Question 18

Gill

Answer 18

Filamentous organ in aquatic animals specialized for the exchange of gases with water

Question 19

Coelom

Answer 19

Fluid filled body cavity lined with mesoderm

Question 20

Nephridium

Answer 20

Excretory organ of an annelid that filters fluid in the coelom

Question 21

Clitellum

Answer 21

Band of thickened, specialized segments in annelids that secretes a mucous ring into which eggs and sperm are released

Question 22

Trochophore

Answer 22

Free swimming larval stage of aquatic mollusk

Question 23

Foot

Answer 23

Muscular part of a mullusk

Question 24

Mantle

Answer 24

Thin layer of tissue that covers most of a mollusks body

Question 25

Shell

Answer 25

Structure in mollusks made by glands in the mantle that secrete calcium carbonate

Question 26

Visceral mass

Answer 26

Area beneath the mantle of a mollusk that contains the internal organs

Question 27

Radula

Answer 27

Tougne shaped structure used for feeding by snails and slugs

Question 28

Siphon

Answer 28

Tubelike structure through which water enters and leaves the mollusks body

Question 29

Open circulatory system

Answer 29

System in which blood is not always contained within a network of blood vessels