Animals (Porifera,Cnidaria, Platyhelminthes,Nematoda, And Annelida

Question 1

What are organisms that cannot produce their own food called?

Answer 1

Heterotrophs

Question 2

What are the two major groups that animals can be grouped into?

Answer 2

Invertebrates and vertebrates

Question 3

What is the hollow ball of cells called that forms when the zygote divides repeatedly?

Answer 3

Blastula

Question 4

What happens during the process of the blastula folding inward?

Answer 4

Gastrulation

Question 5

What are the three germ layers?

Answer 5

Ectoderm, mesoderm, endoderm.

Question 6

What is the name given to the body cavity found between the gut and the body wall?

Answer 6

Coelom.

Question 7

What is the membrane-like layer lining the body cavity called?

Answer 7

Peritoneum

Question 8

What is the concentration of nerve tissue at the anterior end of the body called?

Answer 8

Cephalization.

Question 9

What are organisms that cannot move called?

Answer 9

Sessile organisms.

Question 10

What are organisms that have both types of sex organs called?

Answer 10

Hermaphrodites

Question 11

What cells conduct water through a sponge?

Answer 11

Collar cells (choanocytes).

Question 12

Why do sponges not need any specialized body systems or tissues?

Answer 12

They rely on diffusion for nutrient and waste exchange.

Question 13

Which germ layers are present in Poriferans?

Answer 13

None (Poriferans are considered to have no true tissues).

Question 14

What are the two body forms found in Cnidarians?

Answer 14

Polyp and medusa.

Question 15

What is the name given to the barbed “stingers” of cnidarians?

Answer 15

Nematocysts

Question 16

What is the “jelly” in jellyfish scientifically known as?

Answer 16

Mesoglea

Question 17

How do some cnidarians, like Hydras, reproduce asexually?

Answer 17

Budding

Question 18

What is the “jelly” in jellyfish scientifically known as?

Answer 18

Mesoglea

Question 19

What kind of symmetry do cnidarians have?

Answer 19

Radial symmetry.

Question 20

Incomplete digestive tract (one opening).

Answer 20

gastrovascular cavity

Question 21

Members of Phylum Platyhelminthes are known commonly as

Answer 21

Flatworms

Question 22

What kind of symmetry is characteristic of Phylum Platyhelminthes?

Answer 22

Bilateral symmetry

Question 23

Is an epidermal layer modified for protecting parasitic organisms from digestive enzymes and immune responses of the host.

Answer 23

Tegument

Question 24

The head of a tapeworm is called the

Answer 24

Scolex

Question 25

The segments of a tapeworm, containing the reproductive organs are called

Answer 25

Proglottids

Question 26

Describe the digestive system of a tapeworm.

Answer 26

Tapeworms have no digestive system; they absorb nutrients directly through their tegument.

Question 27

What two adaptations for securing itself does the tapeworm have on its scolex?

Answer 27

Hooks and suckers

Question 28

What advancement is found in nematode digestive systems over simpler phyla?

Answer 28

A complete digestive tract with a mouth and an anus

Question 29

What is distinctive about the circulatory system of earthworms?

Answer 29

Earthworms have a closed circulatory system with blood vessels and five aortic arches (“hearts”).

Question 30

Earthworms are hermaphrodites. What does this mean?

Answer 30

They have both male and female reproductive organs.

Question 31

What are the functions of the following structures in earthworms?: Clitellum ,Crop , Setae, Nephridia

Answer 31

Clitellum: Produces mucus for reproduction and forms a cocoon for fertilized eggs • Crop: Stores food temporarily • Setae: Bristles for movement and anchoring • Nephridia: Excrete metabolic waste