1. DESCRIBE 3 OBSERVATIONS ABOUT THE MARINE SPONGE
Hint : THE TEXTURE OF A SYNTHETIC SPONGE IS SIMILAR TO A MARINE SPONGE
WRITE OBSERVATIONS ON BOARD

2. SPONGES

3. INSTRUCTIONAL OBJECTIVES SPONGES

4. MARINE SPONGES
SPONGES are 1. elastic 2. have many holes 3. all sponge parts look alike 4. adult sponge is sessile-doesn’t move
Sponges have several ADAPTATIONS that help them survive in the marine environment
Sponges are multicellular animals and are classified in kingdom animal and phylum porifera (pore bearing)
GUESS THE AIM???

5. AIM: HOW ARE SPONGES ADAPTED TO THEIR ENVIRONMENT?
Tell story about ancient sponges/divers-museum exhibit
ACTIVITY-LABEL WORKSHEET and DRAW ARROWS OF WATER FLOW
DRAW and LABEL COLLAR CELL/CHOANOCYTE

6. SPONGE ANATOMY and WATER FLOW

7. SPONGE REVIEW IN LESSON

8. KEY QUESTIONS/VOCABULARY
HOW DO SPONGES INGEST FOOD? EXCRETE WASTES? DIGEST FOOD? BREATHE/RESPIRE? DEFEND ITSELF? REPRODUCE/GENDER TYPE?
VOCABULARY 1. amebocyte-undifferentiated cell
2. CHOANOCYTE-collar cell
HOW DO COLLAR CELLS WORK? 1. flagella beat in unison creating current of water into ostia and through collar cells 2. collar captures food particles in water 3. food vacuole within cell digests food

9. SPONGE STRUCTURE FUNCTION CHART
ostia
osculum
Collar cells
Ectoderm
Endoderm
spicules

10. CREATE STRUCTURE FUNCTION CHART
Sponge Structure
FUNCTION and explanation
OSTIA(small pores)
Ingestion-filter feed micro food particles out of water
OSCULUM-located on top
Excretion-eliminate waste
COLLAR CELLS-located within central cavity(have flagella)
Digestion-food vacuole with enzymes
Filter feeding- flagella beating brings food in
Ectoderm- outer cell layer
Endoderm-inner cell layer
Respiration-exchange of Oxygen and Carbon dioxide for energy
spicules
Structure and defense against predators

11. HOW DO SPONGES REPRODUCE?
HOW DO I MAKE BABIES?

12. HOW DO SPONGES REPRODUCE?
GENDER-HERMAPHRODITES-being both male and female. Can switch back and forth making eggs and sperm. Can change sex
Asexual-budding or regeneration, small piece breaks off and grows. Identical DNA-exact clone. 1 parent
Sexual-2 parents. Sperm and egg form zygote, external fertilization and external development
How do sponges know when to release gametes simultaneously? Environmental cues like temperature, PH…..

13. WHY ARE SPONGES CONSIDERED TO BE SIMPLE MULTICELLULAR ORGANISMS?

14. WHY ARE SPONGES CONSIDERED TO BE SIMPLE, MULTICELLULAR ANIMALS?
The sponge is a simple animal because they have no organs(2 cell layers) which are the ectoderm and endoderm. The sponge lacks any specialization.
Comparatively most animals have organs which is third germ layer.

15. SUMMARY
The sponge is a simple pore-bearing, filter feeding, multicellular organism that is composed of two layers of (mostly unspecialized cells). The sponge is classified in phylum porifera.

16. SPONGE EXIT QUIZ 1. T or F. Correct for full credit
Sponges use collar cells for locomotion.
2. Describe in detail how sponges ingest food? Include diet.
3. Sponges excrete waste using its:
A. Ostia B. choanocytes C. osculum D. spicules
4. Why are sponges considered to be simple, multicellular animals?