Chapter 26: Sponges and Cnidaries / Chapter 27: Worms and Mollusks

Question 0

Animal that has a vertebral column, or backbone

Answer 0

Vertebrate

Question 1

Animal that does not have a backbone, or vertebral column

Answer 1

Invertebrate

Question 2

Innermost germ layer of most animals; develops into the linings of the digestive track and much of the respiratory system

Answer 2

Endoderm

Question 3

Middle germ layer of most animals; gives rise to muscles and much of the circulatory, reproductive, and excretory systems

Answer 3

Mesoderm

Question 4

Animal that relies on interactions with the environment to help it control body temperature

Answer 4

Ectoderm

Question 5

Body plan in which body parts repeat around the center of the body; characteristic of sea anemones and sea stars

Answer 5

Radial Symmetry

Question 6

Body plan in which only a single, imaginary line can divide the body into two equal halves; characteristic of worms, arthropods, and chordates

Answer 6

Bilateral Symmetry

Question 7

Concentration of sense organs and nerve cells at the front of an animal’s body

Answer 7

Cephalization

Question 8

Individual that has both male and female reproductive organs

Answer 8

Hermaphrodite

Question 9

Head of an adult tapeworm; can contain suckers or hooks

Answer 9

Scolex

Question 10

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

Answer 10

Proglottid

Question 11

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

Answer 11

Clitellum

Question 12

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

Answer 12

Open Circulatory System