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

SPONGES

INSTRUCTIONAL OBJECTIVES SPONGES

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???

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

SPONGE ANATOMY and WATER FLOW

SPONGE REVIEW IN LESSON

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

SPONGE STRUCTURE FUNCTION CHART ostia osculum Collar cells Ectoderm Endoderm spicules

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

HOW DO SPONGES REPRODUCE? HOW DO I MAKE BABIES?

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…..

WHY ARE SPONGES CONSIDERED TO BE SIMPLE MULTICELLULAR ORGANISMS?

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.

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.

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?