Sponges and Cnidarians

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Presentation transcript:

Sponges and Cnidarians 4/14/15 Mr.Faia 6th Grade Science

Sponges For a long time, sponges were thought of as plants Sponges stay in 1 place, but are heterotrophs They have been around for 540 million years!

Sponges Sponges have irregular shapes and no symmetry Some cells have specialized jobs

Structure of a Sponge The body of a sponge is like a bag pierced with holes These holes are called pores

Getting Food and Oxygen from Water Sponges strain food from water Collar cells trap food as water passes through

Getting Food and Oxygen from Water Oxygen enters the sponge by diffusion What is diffusion? What else can diffusion do for a sponge?

Spikes Sponge bodies are supported by spikes Spikes can be very sharp Sponges can also produce irritating substances What do we call these traits?

Reproduction Can reproduce both sexually and asexually Budding –

Reproduction Produce egg cells during 1 point of year Produce sperm cells during another point After fertilization, a larva forms

Cnidarians 3 Members of the phylum Jellyfish Sea Anemones Corals

Cnidarians Traits Stinging Cells Hollow cavity for food Carnivores Specialized Tissues

Body Plans Radial Symmetry 2 Body plans Polyp Medusa

Body Plans Polyp Hydra Sea Anemone Coral

Body Plans Medusa Jellyfish

Eating Cnidarians sting their prey with venom Tentacles then pull the food into the mouth Where does undigested food go?

Reproduction Both asexually and sexually How does a polyp reproduce?

Coral Coral reefs start with a free-swimming coral larva Larva attaches to a solid surface

Coral Coral polyp reproduces asexually, and so does its offspring Over time the number of polyps can reach thousands

REVIEW 1) Describe the structure of a sponge’s body 2) How do cnidarians capture food? 3) How does a jellyfish capture food? 4) How do polyps reproduce? 5) What are the 2 types of cnidarian body plans? 6) Which body type is free-swimming? 7) What supports the body of a sponge? 8) How do sponges get food? 9) How does coral reproduce? 10) What type of symmetry do sponges have?