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4 Written questions

3 Multiple choice questions

  1. They lack tissues, organs, and organ system.
  2. Gas exchange and excretion occur via diffusion across individual cell membranes.
  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. • Number of tissueno body cavity


  2. What is the sponge body comprised of?The sponge body is comprised of a couple different cell types that form the outside and inside layers of the body wall.


  3. What are choanocytes?They lack tissues, organs, and organ system.