cnidaria

Question 1

What is the distinguishing feature of Cnidaria?

Answer 1

the presence of cnidocytes

Question 2

What group do the Cnidarians and Ctenophores make up?

Answer 2

Eumetazoa, or true animals

Question 3

What body symmetry are Cnidarians?

Answer 3

radial

Question 4

How many tissue layers do the Cnidarians possess?

Answer 4

2, epidermis and gastrodermis

Question 5

What is located in between the two tissue layers of Cnidarians?

Answer 5

mesoglea

Question 6

What cavity does the gastrodermis line?

Answer 6

gastrovascular cavity

Question 7

How many body forms do Cnidarians have?

Answer 7

2, polyp and medusa

Question 8

Describe the polyp stage.

Answer 8

cylindrical organism attached to substrate

Question 9

Describe the medusa stage.

Answer 9

umbrella shaped, free floating, mouth on underside

Question 10

What structure system is present in Cnidarians?

Answer 10

hydrostatic skeleton

Question 11

Name the 3 main classes of Cnidarians.

Answer 11

anthozoa, scyphozoa, hydrozoa

Question 12

What is the distinguishing feature of anthozoa?

Answer 12

exist only as polyps; medusa stage lost

Question 13

What is the distinguishing feature of hydrozoa?

Answer 13

polyp form is predominant

Question 14

What is the distinguishing feature of scyphozoa?

Answer 14

medusa stage is predominant

Question 15

Describe reproduction in hydrozoans.

Answer 15

asexual in polyp form, sexual in medusa form

Question 16

Are hydrozoans colonial or single living?

Answer 16

most are colonial

Question 17

How do hydrozoans reproduce asexually?

Answer 17

budding

Question 18

How do hydrozoans reproduce sexually?

Answer 18

female develop ovary that produces egg, male form testis to produce sperm. zygote then leaves parent

Question 19

When do hydrozoans reproduce asexual vs sexually?

Answer 19

asexual normally, sexually when environment becomes unfavorable

Question 20

Are hydrozoans monoecious or dioecious?

Answer 20

can be both

Question 21

Name 2 common genus of hyrozoans.

Answer 21

hydra and obelia

Question 22

Describe the hydra genus.

Answer 22

polyp stage predominant, medusa stage lost

Question 23

Describe the obelia genus.

Answer 23

colonial, connected by branches of common gastrovascular cavity

Question 24

What are some distinguishing features of scyphozoa?

Answer 24

thick gelatinous mesoglea, medusa stage dominant

Question 25

Name a common genus of scyphozoa.

Answer 25

cyanea

Question 26

What are some distinguishing features of anthozoa?

Answer 26

sessile, no medusa stage, solitary or colonial

Question 27

Name a common solitary anthozoan.

Answer 27

sea anemone

Question 28

Name a common colonial anthozoan.

Answer 28

coral

Question 29

Name a common anthozoan genus.

Answer 29

metridium