<p> Name: ______Date: ______UNIT 5 Notes #3 - Phylum Cnidarian</p><p>A) Examples of Cnidarians</p><p>1.______</p><p>-______</p><p>-Spend ______-No medusa stage, other hydrazoans have a very short medusa stage.</p><p>2. ______</p><p>-Class ______-Jellyfish go through the same life-cycle stages as hydrozoans</p><p>-In Scyphozoans the ______</p><p>______- The ______of most jellyfish are harmless to humans, but a few can cause painful stings.</p><p>3. ______</p><p>-Class ______</p><p>Anthozoans have ______in their life cycle.</p><p>B) Cnidarian______: </p><p>Body Plan: - ______body with a single opening.</p><p>- Opening will allow ______- Surrounding the mouth is a ring of tentacles (usually contains stinging cells)</p><p>- ______contain nematocysts; when touched, the ______</p><p>______, paralyzing or trapping it. - Separating the outer ectoderm from the inner endoderm is a layer of mesoglea. (Mesoglea offers support for the animal).</p><p>-The body has ______. a) ______– Usually attached to some object with the______</p><p>______. </p><p>- ______(non-motile stuck to the bottom) b) ______– ______</p><p>______</p><p>- Locomotion is achieved by individual ______cells all working together to change shape. - Nematocysts fire on contact, after paralyzing its prey,______</p><p>______. C) Various Body Systems: 1) DIGESTION: Food is ______</p><p>______in order to digest food. Other cells of the ______will then absorb the digested nutrients. Indigestible material will then ______</p><p>______</p><p>2) CIRCULATION: ______. Food/nutrient particles will be passed through the central cavity by body movements and by flagellated cells in the endoderm. Thus the cavity is involved in both ______</p><p>3) ______and______: </p><p>-Both take place by ______that bathes the tissues.</p><p>4)NERVOUS: There is a limited amount of nervous and sensory tissue. This ______is used for co-ordination. Sensory cells are sensitive to touch and various chemicals.</p><p>5) MUSCULAR: ______</p><p>______</p><p>6) REPRODUCTION: </p><p>______- Many______, this may form new polyps or medusae.</p><p>______- ______reproduces sexually. ______</p><p>______which travel through the water to the ______which has produced eggs.</p><p>- The fertilized eggs are released out of the mouth to develop into______</p><p>______, this stage will usually develop into a polyp.</p><p>- Some Cnidarians (ex hydra, sea anemone) have polyps that can also reproduce sexually.</p><p>D) Advantages of Motile and Non-Motile Stages/Forms In Life Cycle: a) If motile,______; if non-motile you stay</p><p>______b) Advantage of being sessile (______) is that they ______</p><p>______c) Disadvantage of being motile is that you can easily get carried away by the water currents.</p><p>E) ______of Cnidarians:</p><p>- ______with other animals.</p><p>- ______for many marine animals. They contain tunnels, caves, and deep channels in which animals live. Coral reefs </p><p>______and for animals that produce valuable shells, pearls, and jewelry.</p><p>-Protect land from erosion by______. If destroyed, large amounts of shoreline maybe washed away.</p><p>-______by many Cnidarians.</p><p>- ______- ______</p>