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ANIMAL KINGDOM 1 Page 76 ABBOTTSCOLLEGE PHYLUM CNIDARIA.

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Presentation on theme: "ANIMAL KINGDOM 1 Page 76 ABBOTTSCOLLEGE PHYLUM CNIDARIA."— Presentation transcript:

1 ANIMAL KINGDOM 1 Page 76 ABBOTTSCOLLEGE PHYLUM CNIDARIA

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4 PHYLUM CNIDARIA 4 Includes between and species Includes the plant like hydroids, the flower like sea anemones, the jelly- fish, bluebottles and the hard corals

5 BODY PLAN OF CNIDARIA 5  Acoelomate (have no body cavity)  Radial symmetry  Diploblastic tissue layers  Digestive cavity with a single opening The body wall is made up of three layers But there are only two layers of cells (the ectoderm and endoderm) The middle layer (mesogloea) is jelly PAGE 76

6 DIPLOBLASTIC TISSUE LAYERS 6 The ectoderm forms the epidermis The endoderm forms the gastrodermis (around the gut) There is a layer of jelly between the two = mesogloea BODY WALL CNIDARIA

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8 RADIAL SYMMETRY 8  Suits their sessile or free floating mode of living  Makes them aware of what is happening all around them

9 DIGESTIVE CAVITY WITH A SINGLE OPENING 9  Serves as both a mouth and an anus  Inefficient digestive system  Have a ring of tentacles around the opening to catch food  Have specialised stinging cells or cnidocytes  Which contain stinging organelles called nematocysts to capture their prey and defend themselves against predators

10 10 Hydra is a genus of small, simple, fresh-water animals that possess radial symmetry. genusradial symmetry Hydra are predatory animals belonging to the phylum Cnidaria predatoryCnidaria

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16 REPRODUCTION 16  Have a dimorphic life cycle (develop two basic body forms)  Medusa  Free swimming and umbrella shaped  Develops gonads  Reproduces sexually to produce a free-swimming planula larva  Polyp  Develops from the larva  May occur singly (eg anemones)  Or in enormous marine colonies (eg corals) Page 76

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18 18 Life cycle Cnidaria

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20 20 Coral Coral Reef Corals are marine invertebrates in phylum Cnidaria typically living in compact colonies of many identical individual "polyps".

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25 TO DO 25 TEXTBOOK PAGE 78LEARNING ACTIVITY 1QUESTIONS 1, 2 AND 3BODY PLANS OF ANIMALS PASTE IN DIAGRAMS IN YOUR WORKBOOK

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