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Date ______ Tropism Web Activity Name _________________ Hormones and Tropisms Go to the website: http://www.springer.com/cda/content/document/cda_downloaddocument/3701s.swf?SGWID=0-0-45-754500-0 Read the introduction and Click on the animation tab. Choose the “Photoropism Experimnets” option 1. After reading the introduction, why have plants evolved phototropism and gravitropism? 2. Watch the animations and describe the pattern of plant growth with each of the 4 different types of blindfolds. a. Clear cap: b. Opaque cap: c. Clear Sheath: d. Opaque Sheath: 3. Click on the “Summary” button. What is the light sensitive part of the plant? Provide evidence to support your answer. Click on the animations tab. Select the “Gravitropism and Phototropism” option then select “Step Through” at the bottom of the page. Watch the animation for both “Auxin in Gravitropism” and “Auxin in Phototropism” 4. What hormone is responsible for tropisms in plants? 5. Where in the plant is the auxin originally located? 6. What effect does auxin have on plant cells? 7. In your own words explain how auxin causes gravitropism when a plant is tipped on its side? 8. In your own words explain how auxin causes phototropism when light is shined on one side of a plant? Date ______ Tropism Web Activity Name _________________ Plant Tropisms - Use this link to watch movies for the following tropisms. http://www.pbslearningmedia.org/asset/lsps07_int_plantmovies/ Introduction 9. Explain why plant movements often go unnoticed? Video 1: Seed Germination and Gravity 10. What is the difference between the two seeds in the video? 11. What is the first structure that emerges from the embryo (root or stem)? 12. After watching the video explain why is gravitropism important for seed germination? Video 2: Light and Dark Responses 13. Explain how plants grow differently in the dark compared to the plants grown in the light? 14. Explain why seedlings would grow differently in the dark. Video 3: Twining Vines 15. Why does this plant swing around as it grows? 16. What type of tropism is shown in the video? 17. Describe what happens when the plant finally bumps into the support? Video 4: Plant Growth and Gravity 18. Describe what happens when the plant is turned on its side? 19. Does this video show a positive or negative response to gravity?