| Term | Definition |
|---|
| What is a Cnidarian? | Soft bodied animals with stinging tentacles arranged in circles around their mouth. |
| What is an example of a cnidarian? | Hydra, Jellyfish, Sea Anemones, Corals |
| What type of symmetry do cnidarians have? | Radial |
| Are cnidarians herbivores or carnivores? | Carnivores |
| What are the two body forms of cnidarians? | Polyps and medusa |
| How do the tentacles face in a polyp? | Up |
| How do the tentacles face in a medusa? | Down |
| What is the inner layer of cells? | Endoderm |
| What is the middle jelly-like layer of cells? | Mesoglea |
| What is the outer layer of cells? | Ectoderm |
| What do the cnidarian's sting their prey with? | Nematocysts |
| The food is pulled into what cavity? | Gastrovascular Cavity |
| Define a nematocysts | Stinging cells that contain poison |
| How do aquatic animals move oxygen and carbon dioxide through their skin? | Diffusion |
| What part of the nervous system tells the cnidarian which way is up? | The statocysts |
| What detects light in the cnidarian? | Ocelli |
| What type of movement do cnidarians use? | Jet propulsion |
| How do cnidarians reproduce? | Sexually and asexually |
| Polyps reproduce asexually by what? | Budding |
| In waht stage is the dnicarian in when sexual reproduction takes place with external fertilization? | Medusa Stage |
| How many classes of cnidarians are there? | 3 |
| Class #1 is called.... | Scyphozoa |
| What is an example of a Scyphozoa? | Jellyfish |
| Most of the scyphozoa's life is spend in what stage? | Medusa |
| What is the second class of cnidarians called? | Hydrozoa |
| Give and example of a Hydrozoa? | Hydra, Portuguese Man of War |
| A Portuguese Man of War has polyps that form what? | A balloon like float |
| What is the 3rd class of cnidarians? | Anthozoa |
| Waht is the only stage an anthozoa grows in? | Polyp |
| How do anthozoas reproduce? | Sexually and by budding |
| Algae and coral have what type of relationship? | Symbiotic |
| What is a symbiotic relationship? | One that is beneficial to both |
| Where do coral reefs form? | Distribution determined by temperature, water depth and light intensity. |
| What harms coral reefs? | fertilizer, industrial pollutants and humans |
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