Bio 2.2 Cnidaria

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pugluv01
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196692
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Bio 2.2 Cnidaria
Updated:
2013-01-30 20:46:47
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spring 2013 bio22 labexam1
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Cnidaria
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  1. What symmetry do organisms in this phylum have?
    Radial
  2. Cnidocytes
    Stinging cells
  3. What level of organization are these organisms?
    Tissue
  4. Polyp Body Type
    Attached and sessile
  5. Medusa Body Type
    Free-swimming
  6. How many embryonic layers does this phylum have?
    Two (diploblastic): endoderm and ectoderm
  7. Triploblastic
    Three embryonic layers: endoderm, ectoderm and mesoderm
  8. Incomplete Gut
    • Formed by endoderm.
    • There is only one opening that serves as both the mouth and the anus.
  9. Gastrovascular Cavity
    Functions as both the digestive system and the transport system.
  10. Mesoglea
    Glycoprotein holding the tissues together.
  11. What are the three main classes of cnidaria?
    • Hydrozoa
    • Scyphozoa
    • Anthozoa
  12. Hydrozoa
    • Go through both polyp and medusa stages.
    • Medusae have velum, which is a shape-holding ring of tissue at the bottom of the exumbrella.
    • Ex: Obelia
  13. Scyphozoa
    • Medusa stage only.
    • Ex: Aurelia
  14. Anthozoa
    • Polyp stage only.
    • Solitary or colonial.
    • Ex: Metridium
  15. Name the parts of this image of Aurelia:
    Oral Arms
    Mouth
    Gonads
    Tentacles
    Cnidocytes
    Exumbrella
  16. Nematocysts
    Filamentous organelles that are expelled from cnidocytes.
  17. On the picture of the Aurelia life cycle, label the:
    Strobila
    Strobilates
    Ephyras
  18. In the picture of Aurelia Ephyra label:
    Rhopalia

    Define ocellus and statcyst.



    • Ocellus: light sensation
    • Statocyst: gravity sensation
  19. What are polyp colonies called?
    Hydroids
  20. In the Obelia picture, label (and define):
    Coenosarcs
    Hydranth
    Gonangium


    • Hydranth: Feeding polyp
    • Gonangium: Reproductive polyp
  21. Hermatypic
    Corals that harbor symbiotic algae.

    Small polyps, create huge coral reefs because they house their own food supply.
  22. Ahermatypic
    Corals that do not house ay photosynthetic symbionts.

    Larger polyps.

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