Cnidaria

Question 1

What species make up Cnidaria?

Answer 1

Jellyfish, hydra, coral, anemone

Question 2

What are Cnidaria like?

Answer 2

Marine, aquatic, carnivores, dimorphic body plan

Question 3

What is the structure of a polyp?

Answer 3

Gastrovascular cavity surrounded by mesoglea (jelly filling) then surrounded by epidermis, hollow tentacles. Pedal base (?)

Question 4

What is the structure of a medusa?

Answer 4

Gastrovascular cavity surrounded by mesoglea then surrounded by epidermis, tentacles facing downwards (hollow)

Question 5

What is a cnidocyte?

Answer 5

Barb. Contain organelle called Cnida or cnidocyst.

Question 6

What is hydrozoa?

Answer 6

Can have both forms but mainly polyp. Diverse with regards to shape, colonial, could look like a plant or polyp. Ex for mimicking polyp or jellyfish.

Question 7

What is Scyphozoa

Answer 7

Both forms but mainly medusa. True jellyfish.

Question 8

Anthrozoa

Answer 8

Flower animals. Corals and sea anemone, polyp only, marine only, tropical, shallow H2O, hard Calcium carbonate case, some have mutualistic relationship with algae.

Question 9

Describe the colonial Obelia

Answer 9

Hydrozoa, Hydranth for reproduction, perisarc is outside while coenosarc is inside, goangium for …,

Question 10

How many germ layers do cnidarians have, name these germ layers and the adult derivatives

Answer 10

They have three germ layers, the exoderm (epidermis), the endoderm (gastrovascular cavity), separated my the filler mesoglea

Question 11

What are the two cnidarian body plans?

Answer 11

Medusa and polyp

Question 12

What features do Cnidarians have

Answer 12

tentacle, mouth, epidermis, mesoglea, gastrodermis, cnidocyte, also have a nerve net

Question 13

How do they catch food? How do they digest it?

Answer 13

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Question 14

Is the gastrovascular cavity a secondary body cavity?

Answer 14

No, primary?

Question 15

Radial vs biradial symmetry

Answer 15

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Question 16

WHere is the mouth located>

Answer 16

On the oral side. The anus is also here, one and the same?

Question 17

What is the function of the cnidocyte?

Answer 17

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Question 18

What’s the lifecycle like of a true jellyfish? Which stages are mobile? Which one is a colony?

Answer 18

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Question 19

When do sexual and asexual reproduction occur?

Answer 19

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Question 20

How do medusa (jellyfish move? How do hydra (polyp) move?

Answer 20

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Question 21

Are cnidarians predators or prey?

Answer 21

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Question 22

What are the four Classes, differentiate them.

Answer 22

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Question 23

What makes myxozoans different?

Answer 23

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Question 24

Which ones can live in freshwater?

Answer 24

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Question 25

why were ctenophores thought to be closely related to cnidarians

Answer 25

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Question 26

What are cenophores like?

Answer 26

ctenophores are marine only, have colloblasts to collect food, 3 germ layers, and use ctenes for locomotion. Marine only. Its larval stage is a cydippid and is mobile.