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26.2 Sponges
Choanocyte• Specialized cell in sponges that uses a  flagellum to move a steady current of water  through the sponge.
osculum• Large hole at the top of the sponge through  which water leaves the sponge
Spicule• Spike-shaped structure that makes up the  skeletons of harder sponges; made of either  calcium carbonate or silica.
Archaeocyte• Specialized cell in a sponge that makes  spicules
Internal fertilization• Process in which eggs are fertilized inside the  female’s body.
larva• Immature stage of an organism that looks  different from the adult form.
Gemmule• Group of archaeocytes surrounded by a tough  layer of spicules; produced by some sponges.
Key Concept• Sponges are classified as animals because they  are mulitcellular; heterotrophic, have no cell  walls, and co...
Key Concept• The movement of water through the sponge  provides a simple mechanism for  feeding, respiration, circulation,...
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Biology 26.2

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Biology 26.2

  1. 1. 26.2 Sponges
  2. 2. Choanocyte• Specialized cell in sponges that uses a flagellum to move a steady current of water through the sponge.
  3. 3. osculum• Large hole at the top of the sponge through which water leaves the sponge
  4. 4. Spicule• Spike-shaped structure that makes up the skeletons of harder sponges; made of either calcium carbonate or silica.
  5. 5. Archaeocyte• Specialized cell in a sponge that makes spicules
  6. 6. Internal fertilization• Process in which eggs are fertilized inside the female’s body.
  7. 7. larva• Immature stage of an organism that looks different from the adult form.
  8. 8. Gemmule• Group of archaeocytes surrounded by a tough layer of spicules; produced by some sponges.
  9. 9. Key Concept• Sponges are classified as animals because they are mulitcellular; heterotrophic, have no cell walls, and contain a few specialized cells.
  10. 10. Key Concept• The movement of water through the sponge provides a simple mechanism for feeding, respiration, circulation, and excretion.

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