Read Pages 564-569 and Answer the Following Questions

Read Pages 564-569 and Answer the Following Questions

Biology 11

Ms. Jamieson

Stinging Animals (Cnidaria)

Read pages 564-569 and answer the following questions

Questions / Answers
What are the characteristics of all Cnidarians?
Why don’t Cnidarians have to eat very much?
What are the benefits of the symbiotic relationship to the cnidarian and to the protist?
Label the diagram at right
Why do cnidarians not need organized systems for internal transport, respiration and excretion?
How do cnidarians sense and respond to the world around them?
Briefly describe the 4 classes of cnidarians?
What kinds of symbiotic relationships do cnidarians form and what are the benefits of these relationships?
What are some of the ecological roles of coral reefs?
What are some of the uses that humans have for defensive chemicals of cnidarians? / Radial symmetry
Stinging cells arranged in circles around their mouth
Many cnidarians have tiny photosynthetic protists growing right inside the living cells of the gastroderm
The protists use the carbon dioxide and other metabolic wastes produced by the cnidarians cells to make oxygen and carbohydrates, which they share with the cnidarian
Because most cnidarians are only a few cells thick. The branching gastrovascular cavity carries nutrients to most cells and cells get their oxygen and remove wastes directly from the water
They do not have a brain, but they have a nerve net and sensory cells that sense touch, chemicals from food. Some medusa have statocysts (balance) and simple eyes around the rim of the bell
  1. Hydra spend most of their lives as slender branching polyps
  2. Jellyfish spend most of their lives as medusa
  3. Sea-anemones have only the polyp stage and are solitary
  4. Corals have only polyps and live in colonies with a skeleton of calcium carbonate
Shrimp, fish and other small animals live among the tentacles of sea anemones. The small animals get protection and scraps of food and the sea anemone is kept clean and protected from predators
Coral reefs are also important habitat for many animals, including fish that humans eat and shells that produce pearls. Coral reefs also protect shorelines from storms.
Anti-cancer drugs that help us understand cancer. Nerve toxins that help us understand the nervous system
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