A. Form and Function in Sponges (Phylum _________________)
Ref: Miller & Levine, DOL p 741,754, Heath 450-452, supplementary reading Label the following diagram using the terms located in the table below. Epidermal/epithelial cells Collar cells
Form (structure) Function
Osculum Incurrent pores/Porocytes Amoebocytes Spicules
Adult sponge Buds Gemmules a) Respiratory - b) Excretory - 1.
Feeding and Digestion
•sponges are different from all other animals in that they lack a _____________ & _____________ •__________-feeders - sift microscopic pieces of food from __________ as it passes through •___________ cells have membranous collar that traps food particles - food then ingested by ______________________ •digestion is termed __________________ because it takes place _____________ cells •collar cells may digest food or pass it on to _____________________ •amoebocytes creep through ___________________ - distribute digested food throughout body 2. Roles of Water Flow (describe) c) Internal Transport - d) Sexual Reproduction -
new sponge. Label the following diagram with the following terms: sperm, egg, larva, flagella, a) Eggs & sperm are produced by what cells of a sponge? _________________________________________________________ ________________________________________________________ b) Where in the sponge shown in the diagram does fertilization occur? _________________________________________________________ ________________________________________________________ c) What is a hermaphrodite? Are the sponges in the diagram hermaphrodites? Explain your answer. _________________________________________________________ _________________________________________________________
d) Describe the larva that is produced by sexual reproduction in sponges. _________________________________________________________ ________________________________________________________ e) Are the sponges in the diagram sessile? Why or Why not? _________________________________________________________ _______________________________________________________ f) How do sperm enter a sponge? _________________________________________________________ _______________________________________________________ g) How are sperm transported to eggs within a sponge? _________________________________________________________ _________________________________________________________ h) Are the cells of the larva 2n cells or n cells? Explain your answer. _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________
•sponges reproduce asexually by budding or by production of gemmules a) Budding (describe process) b) Gemmules (describe structure & function)
B. Diversity in Sponges 1. Study “Porifera” chart on back wall & see Heath, p. 452. a) List at least four ways in which sponges differ from each other. b) What characteristics are used to classify sponges?
C. Roles of Sponges
1. Roles - List and describe 2. How are sponges proving useful to medical science? 3. In what ways do sponges differ from all other animals?