Cnidaria Lab Questions

Question 1

Classes

Answer 1

Hydrozoa - Hydra
Scyphozoa - Jellyfish
Anthozoa - anemone, corals

Question 2

Gastrovascular cavity

Answer 2

The only opening to the digestive system, serving as both mouth and anus

Question 3

Polyp

Answer 3

Early form that resembles a hollow cylinder with an opening at the top

Question 4

Medusa

Answer 4

Later body form that resembles an umbrella with the mouth at the bottom

Question 5

Epidermis

Answer 5

outer layer

Question 6

Gastrodermis

Answer 6

inner layer (endodermis)

Question 7

Mesoglea

Answer 7

An acellular “jelly-like” middle layer primarily derived from ectoderm

Question 8

Cnidocytes

Answer 8

Contains the nematocytes, special to cnidirians

Question 9

Nematocytes

Answer 9

a pressurized capsule containing a coiled harpoon-like thread, used for prey capture

Question 10

Respire?

Answer 10

diffusion

Question 11

Excrete?

Answer 11

Waste expelled via mouth or anus

Question 12

Reproduce?

Answer 12

• regeneration
• asexually
• hermaphroditic, sexual (open water fertilization)

Question 13

Move?

Answer 13

rowing, creeping, floating, or sumersaulting

Question 14

Feed?

Answer 14

• carnivores
• extracellular digestion in gastrovascular cavity
• absorption by phagocytosis and pinocytosis

Question 15

Tissues?

Answer 15

epidermis and gastrodermis (endodermis)

Question 16

Organs?

Answer 16

none

Question 17

Organ systems?

Answer 17

none

Question 18

Germ layers?

Answer 18

Diploblastic, 2 germ layers

Question 19

Symmetry?

Answer 19

Radial

Question 20

Cephalization?

Answer 20

None

Question 20

Body cavity?

Answer 20

Aceloemate