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Sponges Chapter 9 Section3.

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Presentation on theme: "Sponges Chapter 9 Section3."— Presentation transcript:

1 Sponges Chapter 9 Section3

2 Live all over the world (oceans, freshwater rivers and lakes)

3 Sponge: Body Structure
Invertebrate animals No body symmetry Never have tissues or organs Looks like a hollow bag Large opening at one end and tiny pores covering the surface Spikes support and protect sponges body Sponge: Body Structure

4 Sponge: Obtaining Food and Oxygen
Eats tiny single-celled organisms Collar cells that line central cavity, trap the tiny organisms Jelly-like cells inside sponge digest, or break down, the food Sponges get oxygen from water Sponge: Obtaining Food and Oxygen


6 Sponges: Reproduction
Asexually Budding: small new structures grow from the sides on an adult sponge Buds eventually break free and begin new life Sexually Sponges produce both sperm cells and egg cells (do not have separate sexes) Sperm cells released in water, enter another sponge, fertilize its eggs, larva develops Larva: immature form of an animal that looks very different from the adult Sponges: Reproduction


8 Cnidarians Chapter 9 Section3

9 Cnidarians Jellyfish, corals, and sea anemones
Invertebrates that have stinging cells to capture food and protect themselves Take food into central body cavity Cnidarians

10 Cnidarians: Body Structure
Two different body plans (vase and bowl) Radial symmetry Central hollow cavity Tentacles containing stinging cells Cnidarians: Body Structure

11 Vase-shaped body plan is a POLYP
Sea anemone Mouth opens at top Tentacles spread out from around mouth Most are attached to underwater surface Body Structure: Polyp

12 Body Structure: Medusa
Bowl-shaped body plan is a MEDUSA Jellyfish Adapted for a swimming life Mouths open downward and tentacles trail down Body Structure: Medusa

13 Obtaining Food Use stinging cells to catch animals they eat (prey)
Contains threadlike structure with spines Uses tentacles to pull prey to mouth Takes food into central body cavity Expels undigested food through mouth Obtaining Food

14 Unlike adult sponges, many cnidarians move to escape danger and to obtain food
Jellyfish? Sea Anemones? Movement

15 Reproduction Asexual Reproduction Sexual Reproduction
Hydras, corals, and sea anemones Sexual Reproduction Jellyfish Reproduction

16 Colony Life in a Colony a group of many individual animals
Stony corals and Portuguese man-of- war Life in a Colony

17 Stony Coral a coral reef is built by cnidarians
coral reefs are home to more species of fishes and invertebrates than any other environment on Earth Coral polyps produce hard, stony skeletons around their soft bodies Stony Coral

18 Portuguese Man-of-War
Contains as many as 1,000 individuals that function together as one unit Top: gas filled chamber, allows colony to float Bottom: polyps with different functions drift below Some catch prey and help with digestion and reproduction Portuguese Man-of-War


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