Biology Unit 3

Question 1

Invertebrates

Answer 1

Animals that do not have backbones

Question 2

List 3 examples of invertebrates

Answer 2

1. Clams
2. Earthworms
3. Jellyfish

Question 3

List the 3 basic body plans

Answer 3

1. symmetry
2. asymmetrical
3. bilateral symmetry

Question 4

Radial symmetry

Answer 4

where symmetrys center is a vertex

Question 5

Bilateral symmetry

Answer 5

Where symmetrys center is a line

Question 6

Asymmetry

Answer 6

Where there is no symmetry

Question 7

Neutrons

Answer 7

Fibers that allow the animal to sense its enviroment

Question 8

Nerve cords

Answer 8

Packs of neutrons that carry messages along a single path

Question 9

Ganglion

Answer 9

a mass of nerve cells

Question 10

Gut

Answer 10

The digestive tract

Question 11

Coelom

Answer 11

A body cavity that contains the eternal organs

Question 12

Sponges

Answer 12

Simple invertebrates that are asymmetrical and have no tissue, gut, or neutrons.

Question 13

Regeneration

Answer 13

Where part of an invertebrate breaks of and grows into a new organism.

Question 14

Spicules

Answer 14

Structural elements found in most sponges

Question 15

Cnidarians

Answer 15

Invertebrates with no central brain or nerve network

Question 16

List the 3 classes of cnidarians

Answer 16

1. Hydrozoans
2. Jellyfish
3. Sea anemones + corals

Question 17

Flatworms

Answer 17

Simple worms that are bilaterally symmetrical, find there way by light, and have sensory lobes

Question 18

List the three classes of flatworms

Answer 18

1. Planarians and marine flatworms
2. Flukes
3. Tapeworms

Question 19

Roundworms

Answer 19

Worms that have long, slim bodies, are bilaterally symmetrical and have a simple nervous system.

Question 20

What do all invertebrates have in common?

Answer 20

They have no backbone

Question 21

Why do you think it would be important to a parasite that its host survive?

Answer 21

Because it could not survive without the nutrients the host digests.