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Question 1

What is phylum Cnidaria?

Answer 1

Jellyfish, hydra, and sea anemones

Question 2

Explain Cnidarian’s symmetry and body?

Answer 2

A. Soft bodies

B. Exhibit radial symmetry, two germ layers

Question 3

Explain what a Cnidarian’s Epithelium is…

Answer 3

1. The outer layers of a Cnidaria are the epithelium, with a jelly-like middle called the mesoglea
2. The epithelium contains nerve cells and contractile cells
   a) Nerve cells are able to sense outside stimulus and coordinate the animal’s response
   b) Contractile cells bend the organism’s body allowing it to move through the water

Question 4

Explain what’s up with the two body forms of Cnidarians, and what they are…

Answer 4

1. Polyp
   a) Cup-shaped tubular body form with a mouth and tentacles at one end, and a base that attaches to a hard surface on the other end
   b) Sessile
   c) Example: Coral

file:///C:/Users/trgan/Sync/LisA%20school/Polup.png

2. Medusa
   a) Umbrella shaped body with its mouth facing downward and tentacles extending around it
   b) Motile
   c) Example: jelly fish

-Some spend part of their life in both and others only in one

Question 5

All Cnidarians have Sac-like bodies

What are they composed of?

Answer 5

1. Central body
2. Tentacles surrounding the mouth
3. Stinging cells on tentacles