Chapter 26:3 – Cnidarians – Microslide Lab – The Hydra

  1. According to Greek mythology, Hercules cut off the head of a monster called The Hydra, and

    2. each time he cut off one of the heads, a new one grew back. What process explains why the heads grew back?

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    Slide #1

  2. Describe the shape of the hydra. ______________________________________________________

    3. __________________________________________________________________________________

  3. The mouth of the hydra is found at the base of the tentacles, explain why this is a positive

    4. adaptation for the hydra.

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  4. Name the structure that anchors the hydra to a solid surface. _____________________________
  5. How many tentacles does this hydra have? ______________________
  6. Name two functions of the tentacles. 1)_______________________, 2)_______________________
  7. Draw and color-code the hydra. (5 pts., mouth, basal attachment disk, tentacles and body)

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    Slide #2

  8. How do the tentacles exhibit "division of labor"? _______________________________________

    9. __________________________________________________________________________________

  9. Name the specialized cells that are found in the tentacles of the hydra. ______________________
  10. The hydra cannot produce its own food, so it is a ___________________________________.
  11. Explain the four-step process of food getting for the hydra. 1)_________________________,

    12. 2)_________________________, 3)_________________________, 4)_________________________

  12. Give an educated guess as to why a nematocyst can only be use once. _______________________

    13. __________________________________________________________________________________

     

    Slide #3

  13. Give the scientific name for both the mouth and anus of the hydra. _________________________
  14. Explain how the food is taken to the mouth of the hydra. _________________________________

    15. __________________________________________________________________________________

  15. Animals in the group called Coelenterates have this characteristic. _________________________

    16. __________________________________________________________________________________

  16. What is the name for the cavity where the worm is being digested? ________________________

    17. Slide #4

  17. The outer layer of cells in the hydra is called? __________________, inner? _________________
  18. Explain why diffusion works for the hydra. ____________________________________________

    19. __________________________________________________________________________________

  19. Name the three systems of the hydra that are replaced by diffusion. 1)____________________,

    20. 2)____________________, 3)_____________________

  20. Explain how the nerve cell net functions like a system in the hydra. ________________________

    21. __________________________________________________________________________________

    Slide #5

  21. Gland cells produce ___________________________ in order to begin digestion in the hydra.
  22. What organelle of the cell completes digestion in the hydra. ______________________________
  23. Explain the process of phagocytosis. __________________________________________________

    24. __________________________________________________________________________________

  24. Explain why digestion in the hydra is extracellular. ______________________________________

    25. __________________________________________________________________________________

  25. Explain why digestion in the hydra is intracellular. ______________________________________

    26. __________________________________________________________________________________

  26. Draw and color-code the different layers of cells of the hydra, include the two specialized cells of the endoderm. (5 pts.)

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    Slide #6

  27. Name the structure used for sexual reproduction shown on this slide. _______________________
  28. Name the structure used for asexual reproduction shown on this slide. ______________________
  29. Name the gamete produced by this hydra. ________________________________

    30.  

    Slide #7

  30. Name the sexual organ shown on this hydra. _______________________________
  31. Name the gamete produced in this female. _____________________________
  32. How many eggs are ready for fertilization in slide seven. __________________________
  33. What conclusion can you make from the fact that both the male and female can reproduce by budding.

    34. _______________________________________________________________________

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  34. Draw and color-code a male or female hydra with a mature bud. (3 pts.)

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    Slide #8

  35. How many sperm are needed to fertilize a mature hydra egg? _____________________________
  36. Explain how cell division works in the fertilized egg. _____________________________________

    37. __________________________________________________________________________________

  37. Discuss the stages of development between the fertilized egg and mature adult. ______________

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