Cnidarians Flashcards
1
Q
Cnidarians
A
Hydra; Jellyfish
Coelenterates
2
Q
Cnidarian Symmetry?
A
Radial Symmetry
3
Q
Polyp
A
- Vase shaped; Mouth up
- Sessile
- Asexual
4
Q
Medusa
A
- Upside down bowl shaped
- Motile
- Sexual
5
Q
Life cycle of Cnidarian
A
-Planula larva(Free-swimming) stage then either polyp or medusa reproductive stage
6
Q
Cnidarian Cell layers?
A
2 cell layers: ectoderm, endoder, mesoglea
7
Q
Gastrovascular cavity
A
-Where extracellular digestion occurs
8
Q
Why no transport system?
A
Every cell is in direct contact with the environment
9
Q
cnidocytes
A
stinging cells that contain stingers(nematocysts)
10
Q
nematocysts
A
Stingers
11
Q
Where does digestion occur?
A
- In the gastrovascular cavity, which has only 1 opening, the mouth
- Cells of the gastrodermis secrete enzymes into cavity
- Cells contain lysosomes that carry out intracellular digestion and extracellular digestion
12
Q
Nerve net
A
- Where impulses travel in all directions from any site
- The entire animal responds to a single stimulus
