Phylum Porifera - Sponges
Directions: Use the text to answer the following questions. Draw and label each of the specimens provided.
1. Define the following terms:

amoebocytes (mesenchyme cells)

collar cells (choanocytes)

pore cells (porocytes)

osculum

ostium

spongocoel

mesohyl

spongin

spicule

gemmule
2. What limits the size of single-celled animals?
3. Identify and describe the three classes of sponges? What quality differentiates the three?
4. Identify and describe the three body forms of sponges
5. What are the three materials that form a sponge skeleton?
6. How is spongin different from the other two materials that form a sponge skeleton?
7. What role do the amoebocytes play in sponge sexual reproduction?
8. What role do the amoebocytes play in sponge asexual reproduction?
9. In your journal draw a picture of the sponges provided. What characteristics of the sponges might you use
in order to determine what class of sponge each belongs?
10. The diagram below depicts a cross-section of a sponge. Use arrows to show how sponges obtain nutrients
provide a summary. Label the parts indicated.
 choanocytes
 amoebocytes
 porocytes
 spicule