Phylum Cnidaria
Phylum Cnidaria
1
Examples of Cnidaria?
Hydra, Obelia, jellyfish, coral.
1
What is a cnidoblast?
Stinging cell.
1
Cnidaria symmetry?
Radial symmetry, body where parts are arranged around a central point, like slices of a pie.
1
What is a nematocyst?
Harpoon-like stinging structure.
1
Cnidaria tissue layers?
Ectoderm (outer tissue layer that provides protection and has stinging cells (cnidocytes).
Endoderm (inner tissue layer that lines the gastrovascular cavity and is responsible for digesting food).
1
Function of cnidoblasts?
Capture prey and defense.
1
Are cnidarians diploblasts?
Yes, because they have two basic tissue layers: an outer layer and an inner layer.
1
Cnidarian digestive cavity?
Gastrovascular cavity.
1
What is mesoglea?
Jelly layer between tissues.
1
Function of gastrovascular cavity?
Digestion and circulation.
1
How many body openings do cnidaria have?
1 body opening.
1
What is a polyp?
Body form of cnidarians that is usually tube-shaped, attached to a surface, with the mouth and tentacles facing upward.
1
What is a medusa?
Cnidarian body form that is usually bell-shaped, free-swimming, with the mouth and tentacles facing downward.
1
Hydra reproduces asexually by what?
Budding.
1
Obelia has what two stages?
A polyp stage and a medusa stage in its life cycle.