4 Written Questions

1. an organism that obtains organic food molecules by eating other organisms or their byproducts and that cannot synthesize organic compounds from inorganic materials
2. any of the flagellate cells that line the cavities
3. the outer surface layer of cells of a plant or animal
4. one of the small openings in a sponge's body through which water enters

3 Multiple Choice Questions

1. an asexual reproductive structure produced by some freshwater sponges
   1. spicule
   2. osculum
   3. larvae
   4. gemmule
2. an opening in a sponge's body through which water exits
   1. ostia
   2. gemmule
   3. spicule
   4. osculum
3. a fibrous protein that contains sulfur and composes the fibers of the skeleton of some sponges
   1. ostia
   2. spicule
   3. epidermis
   4. spongin

3 True/False Questions

1. larvae → one of the small openings in a sponge's body through which water enters

   True        False

2. spicule → a needle of silica or calcuim carbonate in the skeleton of some sponges

   True        False

3. amoebocyte → within the body wall of a sponge, a specialized cell that crawls about and delivers nutrients from the choanocytes to the rest of the body cells

   True        False