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4 Written questions

3 Multiple choice questions

  1. The sponge body is comprised of a couple different cell types that form the outside and inside layers of the body wall.
  2. Extracellular protein fibers give structure and strength to the sponge body and spicules, spines made of silica or calcium carbonate, offer protection from predation.
  3. In simple sponges, water enter the body through pores in the walls called ostia and passes into the spongocoel, a central space lined with choanocytes where food particles are trapped and digested intracellulary. Nutrients are passed to neighboring cells. Water leaves through a hole at the top of the sponge called the osculum. In more complex body plans, there is no spongocoel but several smaller chambers lined with choanocytes

3 True/False questions

  1. What kind of feeding?intracellular

          

  2. where does gas exchange occur?They lack tissues, organs, and organ system.

          

  3. • Type of body cavityno true tissue

          

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