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Topic : Plants Aim : Describe the role of tropisms in plants.

Topic : Plants Aim : Describe the role of tropisms in plants. Do Now : Explain the function of each part of a plant. HW :. ..videosVenus_Flytrap__Deadly_Meal.wmv. What is a tropism?. Plant response to an external stimulus Positive tropism = grows toward stimulus

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Topic : Plants Aim : Describe the role of tropisms in plants.

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  1. Topic: Plants Aim: Describe the role of tropisms in plants. Do Now: Explain the function of each part of a plant. HW:

  2. ..\videos\Venus_Flytrap__Deadly_Meal.wmv

  3. What is a tropism? Plant response to an external stimulus Positive tropism = grows toward stimulus Negative tropism = grows away from stimulus

  4. What are auxins? Plant hormones Affect the growth of plant tissue

  5. What is the external stimulus for this plant response?

  6. Phototropism Tendency of plant to grow towards the light (stimulus)

  7. Positive tropism

  8. Cells on side opposite the light get longer (caused by auxins) Uneven growth, the plant bends towards the light

  9. Geotropism Plant response to gravity

  10. Roots - Positive tropism

  11. Stems -Negative tropism

  12. http://www.youtube.com/watch?v=F3Oj2er-91s&feature=related

  13. What is the external stimulus for this plant response?

  14. What is the external stimulus for this plant response?

  15. Thigmotropism • Plant response to touch • Positive tropism http://www.youtube.com/watch?v=_SIJ4ov_FxA

  16. What is the external stimulus for this plant response?

  17. Hydrotropism • Plant response to water • Positive tropism

  18. Let’s summarize…. • Describe tropisms. • What are some examples of external stimuli that cause tropisms? • Explain phototropism. • Explain geotropism. • Explain thigmotropism. • Explain hydrotropism

  19. Plant substances that affect plant growth are called • tropisms • glucose • germination • hormones

  20. Plant response to a stimulus is called • photosynthesis • transpiration • tropism • locomotion

  21. An example of a negative tropism is • stems growing up and away from gravity • plants bending towards light • roots growing down towards gravity • Plants growing towards a water source

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