3rd Oragnismal test review

3rd Oragnismal test review - Our third test(Friday the 13th...

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Our third test (Friday the 13th of April) covers material from phylum Cnidaria through the introduction to Echinoderms. In your studying, use chapter 33, vocabulary lists 11 to 14 and the study guide for test 3. 1. Define, describe or explain each of the words in the vocabulary lists. 2. Describe characteristics of the cnidarian class Hydrozoa. Be able to diagram a typical polyp, like Hydra . Draw the life cycle of Obelia . Explain the variety of polyp types that exist in Obelia and in Physalia (Portugese man-o-war). Name the class of true jellyfish. P. Cnidaria Class Hydrozoa -some solitary and sessile, others colonial and motile -polyp form is dominant, medusa is small and inconspicuous or even absent -Hydra : freshwater, solitary polyps, 3 layers (epidermis with contractile cells outside, mesoglea, gastrodermis with glandular cells inside), one cavity, hydrostatic skeleton, gut, cnidocytes on tentacles, hypostome(bump under the mouth), no medusa, sexual (gonads appear on side) and asexual budding -Obelia : small and marine, Life cycle: reproductive polyps gonozooid Budding, each bud develops into medusa with thick mesoglea where sexual reproduction takes place, manubrium, medusa produces gametes that form aliated planula and become polyp Polyp types Gastrozooid—feeding polyps Gonozooid—reproductive polyps -Physalia (Portugese man-o-war): a colony made up of many different types Polyp types Pnematophore—bladder like polyp Gastrozooid—feeding polyp Gonozooid—reproductive polyp Dactylozooid—long (60 m) stinging polyp Class Scypozoa is the class of true jellyfish 3. Diagram the life cycle of Aurelia . To which cnidarian classes do they belong? List and describe all classes in the phylum Cnidaria. What is the ecological importance of corals? P. Cnidaria Class Scypozoa
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-Aurelia aurita : moon jelly Life cycle: In medusa stage, gonads develop on the edge of the gastrovascular cavity Gametes zygote planula falls to the bottom and becomes a polyp that makes longitudinal buds Strobila buds through a process called strobilization P. Cnidaria Class Hydrozoa: -some solitary and sessile, others colonial and motile -polyp form is dominant, medusa is small and inconspicuous or even absent Class Scypozoa: -true jellyfish -medusa dominates and polyp is inconspicuous -separate sexes Class Cubozoa: -box jellyfish -square bell, gives them strength in swimming -voracious predators: feed on stuff as big as them -potent venom that can even kill humans Class Anthozoa: -“flower animals” -sessile, radial symmetry -anemones, corals, lots of diversity -polyp form only—large with sexual and asexual reproduction -subdivision of gastrovascular cavity allows for thick base -exoskeleton—hard or soft; calcareous; form coral reef lots of biodiversity there but today we are losing it -zooxanthellae: symbiosis between coral and other animals that is very important the the ocean ecosystem 4. List unique characteristics of comb jellies. How do they locomote? Why are they termed biradial? What unique cell type do they have? Why can you see them better at
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  • Spring '07
  • Folkerts
  • Cnidaria, P. Cnideria Class Hydrozoa Class Scypozoa Class Cubozoa Class Anthozoa P. Ctenophora Acoelomate Bilateria P. Platyhelminthes Class Turbellaria Class Cestodia Class Trematoda P. Nermertea Pseudocoelomates P. Nematoda P. Rotifera P. Accenthocephala P. Gastr, P. Cnidaria Class, P. Platyhelminthes Class, Cnidaria Class Hydrozoa

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