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4 Written questions

3 Multiple choice questions

  1. intracellular
  2. Sponges are sessile (sedentary), filter feeding animals
  3. They lack tissues, organs, and organ system.

3 True/False questions

  1. • Type of body cavityno true tissue


  2. where does gas exchange occur?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. What are choanocytes?Specialized flagellated cells, choanocytes, move water through and filter food particles from the water