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4 Written questions

3 Multiple choice questions

  1. no true tissue
  2. no body cavity
  3. Gas exchange and excretion occur via diffusion across individual cell membranes.

3 True/False questions

  1. what kind of digestion?intracellular


  2. What kind of feeding?Sponges are sessile (sedentary), filter feeding animals


  3. How does water enter the body?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