Sponges & Cnidarian

Sponges Invertebrates - animals without back bones. Invertebrates - animals without back bones. Simplest of the multicellular animals. Simplest of the multicellular animals. No organ system. No organ system. Kingdom – animalia Kingdom – animalia Phylum - porifera Phylum - porifera

Structure Have thousands of pores which let water flow through it continually. Have thousands of pores which let water flow through it continually. Obtain nourishment and oxygen from this water. Obtain nourishment and oxygen from this water.

Obtaining Food Collar cells-create a current of water through the sponge. Collar cells-create a current of water through the sponge. Collect food as water flows through the body. Collect food as water flows through the body.

Movement Holdfast - root-like - attach the sponge to rocks. Holdfast - root-like - attach the sponge to rocks. Adult sponges are sessile - unable to move on its own. Adult sponges are sessile - unable to move on its own.

Reproduction Budding Budding Regeneration Regeneration Sexual reproduction Sexual reproduction

Characteristics of Cnidarian Invertebrates Invertebrates All Cnidarian have radial symmetry All Cnidarian have radial symmetry Have tentacles with stinging cells. Have tentacles with stinging cells.

Movement Most cnidarians are slow-moving or sessile Most cnidarians are slow-moving or sessile Found on shallow ocean floors, the bottom of ponds or drifting about in water currents. Found on shallow ocean floors, the bottom of ponds or drifting about in water currents.

The two different forms of a Cnidarian body

Examples of cnidarians Jellyfish Jellyfish Sea anemones Sea anemones Coral animals Coral animals

Quiz

Name:_______________ 1. How do sponges move? 2. What is an invertebrate? 3. Label only the blank line.

Name:______________ 1. Name a charactieristic that all cnidarians have? 2. How do sponges eat? 3. Label only the blank line.

Name:_______________ 1. What is radial symmetry? 2. Name 2 characteristics all animals have. 3. Label the blank line ONLY.

1. List 3 ways sponges reproduce. 2. Give an example of a cnidarian. 3. Label the blank line only!