Phylun Cnidaria(Jelly fishes, sea anemones, corals, hydra, obelia): 19. Cnidara

Question

Phylun Cnidaria(Jelly fishes, sea anemones, corals, hydra, obelia):

19. Cnidara have true tissue?_____ Germ layers?______ How many germ layers?___

20; What are the germ layers?_____________, _____________

21. Symmtry is radiad/bilateral?
22. Gut is complete or incomplete?
23. Adult has two forms. What are they?__________, ______________
24. Which form produce gametes?
25. The tentacles are located on polyp/medusa?
26. Tentacles contain stinging cells known as___________.
27. They reproduce asexually by________.

Explanation / Answer

19. Yes (have true tissues); two germ layers. 20. Ectoderm, endoderm. 21. Radial symmetry. 22. Incomplete gut (called a "blind gut"-->has no anus) 23. Polyp (sessile) and medusa (swimming). 24. The medusa stage is sexual and produces gametes. 25. Medusa 26. Nematocytes. 27. Polyps can reproduce by budding. Some Medusa stage cnidarians reproduce asexually by dividing down the middle.

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