24. Outer circular&inner; longitudinal muscle pattern. ll eumatazoans except cni

Question

24. Outer circular&inner; longitudinal muscle pattern. ll eumatazoans except cnidarians B.cnidarians only among the eumatazoans (only two choices) 25. Based on the location of the aperture (opening), the shell below would be categorized as being: A. dextral B. sinistral Please use the figure below to answer the following THREE questions. Annelida (Segmented Cnidaria Arthropoda Roblera Rotfers) ydra insects) Flatworms) snals) (Seo stars) Ancestral colonial 26. In the figure above, which letter marks the divergence (split") between deuterostome and protostome lineages? 27. In the figure above, which letter marks a clade of animals with schizocoelous coelom formation? 28. In the figure above, which letter corresponds to the Metazoa clade? 29. Sponges with the least filtering capacity (relative to their overall size) possess which body form? A. syconoid B. placoid C. leuconoid D. osculoid E. asconoid

Explanation / Answer

Please find the answers below:

Answer 26: Letter E : The phyla echinoderms and chordata belongs to deuterostomes whereas all other lower phyla are protostomes in nature.

Answer 27: Letter D: Schizocoleme is a typical character of protostomes as well as a few deuterostomes but majorly a character of molluscs, annelids and gastropods.

Answer 28: Letter B: Metazoa belongs to the major division of animal classification where all multicellular organisms are present.

Answer 29: Choice C: The leuconoid types of sponges carry choanocytes on their body surface which are used to carry prey such as small bacteria. Thus, they do not require filtering mechanism for catching their food as compared to other classes of sponges.

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