67. Which of the following are not found in sponges? A. oscula. B. Spong ocoels.
ID: 180419 • Letter: 6
Question
67. Which of the following are not found in sponges? A. oscula. B. Spong ocoels. C. Cnidocytes. D. Spicules. E. Amoebocytes. 68. A radially symmetrical animal that has embryonic germ layers belongs to which phylum? Porifera(Parazoa) Cnidaria. Platyhelminthes. Ashelminthes Echinodermata. 69. Which class of the Phylum Cnideria occurs as only a Polyp? Hydrozoa Scyphozoa Anthozoa. Only A and C are correct. A, B, and C are correct. 70 All of these characteristics are found in the phylum Porifera ExCEPT Choanocytes Nematocysts Nerves Flame cells. B, C and D 71.Pores on the leaf surface that function in gas exchange are called. hairs. xylem cells. phloem D stomata sclereidExplanation / Answer
C Cnidocytes,are not found in sponges, these are seen in cnidarians, which are different from sponges. Sponges have pores through out the body for passage of water called oscula, a large central cavity of sponges is called spongocels,exoskeleton of sponges is called spicules,mobile cell which present in sponges is called amoebocytes. B cnidarians, is a radial symmetry animals constains 2 germ layers, ecto and endo respectively. B Scyphozoa, True jelly fish, consists of post larval stage called planula. E BCD are dont have in porifera, Chanocytes are flagellated cells of the porifera,internal chambers of sponges. D. Stomata, are pores of leaves invovles in function of gas exchange is called guttation and transpiration, these contains guard cells.The upper part contains less stomatal opeings than lower to decrease high transpiration rate during hot weathers.
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