Bio Chp 27 Warm up 3

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Bio Chp 27 Warm up 3
2012-05-14 19:40:34
Bio Chp 27

Never had it so GOOD :)
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  1. What is a meeting evolutionary innovation that occurred among cnidarians?
    Extracellular digestion of food
  2. What happens when food is trapped by a sponge chaonocyte?
    it is directly taken to endocytosis and digested intracellularly.
  3. Where in cnidarian's is food digested?
    Extracellularly in a digestive cavity
  4. What has been retained by all of the more advanced groups of animals?
    Extracellular digestion of food.
  5. What are a cnidarian's two basic body forms?
    Medusae & Polyps
  6. Describe the characteristics of a medusae?
    Free-floating, gelatinous, contains lots of mesoglea, the mouth and tentacles face downward, and umbrella shaped
  7. Describe the characteristics of polyps.
    they are cylindrical, pipe shaped, have a little mesoglea, the mouth and tentacles face upwards
  8. What does bilaterally symmetric mean?
    Animals have left and right halves that mirror each other.
  9. Name the 4 parts of a bilaterally symmetric animal?
    Describe them Dorsal- top surface of animal, Ventral- bottom surface, Anterior- front end, Posterior-back end
  10. Bilateral symmetry a major evolutionary advancement among animals?
    It enables different parts of the body to become specialized different ways
  11. What is cephalization?
    The evolution of a head end
  12. Animals with heads are often ______?______ and ______?______.
    Active and mobile
  13. They move through their environment headfirst with sensory organs concentrated in front so the animals can sense what?
    Food, danger, and potential mates
  14. What are the simplest of all the bilaterally to symmetric animals?
  15. How many species of the flatworms exist?
  16. Flatworms are the ___________ animals that have organs
  17. What is an organ?
    A collection of different tissues that work together as a unit to perform a particular function
  18. Describe a flatworm
    Soft body to animals that are flattened from dorsal-ventrally
  19. What are flatworms sense organs called?
  20. What can eyespots do?
    Detect light but cannot focus
  21. What is a flat worms digestive tube or gut surrounded by?
    Tissues or organs
  22. What are the organs?
    Testes and ovaries
  23. Why are flatworms called solid bodied worms?
    They have no body cavity between their digestive track and skin
  24. What is the solid-body construction called?
    Acoelomate meaning "without" "body captivity"
  25. Why must flatworms be thin?
    Because of their acoelomate body design
  26. Flatworms have no circulatory system so what and what can pass through the solid body by diffusion?
    Oxygen and carbon dioxide
  27. What is an advantage of a thin body of a flatworm?
    Shortens distant that the gases must travel to reach each cell.
  28. What is the only opening to the gut?
    The mouth
  29. What enters and exits the mouth of a flatworm?
    Food enters ; waste exits
  30. Some flatworms are ____________ but many are ____________.
    Free-living ; parasites
  31. What is the magor advancement in fatworms?
    bilateral symmetry