Worms WORMS Mrs Howards Life Science Worms WORMS
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Worms, WORMS! Mrs. Howard’s Life Science
Worms, WORMS! Roundworms Flatworms Mrs. Howard’s Life Science Segmented worms Worm Lab Activity
Overview on Worms All worms have the following in common: l They are invertebrates l They all have long, narrow bodies without legs l Have tissues, organs, and organ systems l Bilateral symmetry l Unlike sponges or cnidarians, worms have distinct head and tail ends.
Worms! Worms can regenerate! Segmented worms - if broken, head will regenerate a tail l Flatworms if cut down the middle, will regenerate into 2 new worms l
Roundworms Phylum Nematoda l l l Protection - mouthparts Food - free-living & parasitic Habitat - everywhere Locomotion - muscle contractions Examples Pinworms, Hookworms, Heartworms, Trichinella
Roundworms Phylum Nematoda Special Characteristics l Digestive System l Nervous system l Brain & CNS l About 1/2 are parasitic
Flatworms Phylum Platyhelminthes l l l Planarian Protection mouthparts Food - most are parasitic & live off animals Habitat - water & land Locomotion - muscle contractions Examples - Planarian, Fluke, Tapeworm
Flatworms Phylum Platyhelminthes Special Characteristics Brain and CNS Mouth only (no anus) l
Segmented Worms Phylum Annelida Protection - they burrow and wedge inside hole l Food - Earthworms organic matter in soil Leeches- Blood of host l Habitat - Earthworms moist soil Leeches-Water and moist environments l
Segmented Worms Phylum Annelida Movement - Muscle contractions l Special Characteristics Brain and CNS Most are free-living (except leeches) Mouth & anus No heart but have circulatory system Above should read “breathe through their skin” l
Why do earthworms come to the surface when it rains? Bill Nye will answer: https: //www. youtube. com/watch? v=x. Wj. F 26 Qo QY 4
One final type of worm: There is one final type of worm, I forgot to mention: THE GUMMY WORM! CHARACTERISTICS • Colorful • Stretchy • Delicious : )
Gummy Worm Lab We are going to be observing the property of elasticity in a gummy worm. Using the Scientific Method we will determine how far a gummy worm can stretch and still retain its shape.
Gummy Worm Lab THE SCIENTIFIC METHOD Question or Problem: What is it we are trying to determine? l Hypothesis: Make an Educated Guess on what you think is going to happen? l Experiment: Test your Hypothesis l
Gummy Worm Lab Observations: Make careful observations and record what happens l Analysis: Use your experiment or research to draw conclusions. Was your hypothesis correct? l Results: Present your results by providing a summary of your experiment, hypothesis and conclusions. l
Gummy Worm Lab Specific Instructions are found on the lab handout - have fun!
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