campbell ch 39 by SJ8TL9

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									AP Biology                                           Name ________________________
Campbell Reading Guide                               Date ______________ Period _____

           Chapter 39: Plant Responses to Internal and External Signals

   1. How does light influence sprouting potatoes?

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   2. Describe the steps of the signal-transduction pathway. (Check out Ch 11)

          a. Reception ___________________________________________________

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          a. Transduction _________________________________________________

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          a. Response ___________________________________________________

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   3. What did the early experiments on photoperiodism demonstrate?

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   4. What does auxin do in plant cells that cause elongation?

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   5. Define apical dominance.

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                          Adapted from the work of Ms. Foglia
  6. Identify two functions of gibberellins.

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  7. Identify a few plant responses to ethylene.

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  8. Are all wavelengths of light equal when it comes to phototropism? Explain.

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  9. What are the two forms of phytochrome and how are they switched?

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  10. When do short-day plants flower?

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  11. What happens when short-day plants receive flashes of light?

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                           Adapted from the work of Ms. Foglia
  12. When do long-day plants flower?

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  13. What happens when long-day plants receive flashes of light

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  14. What may be a cause of root gravitropism?

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  15. What is the mechanism that causes Mimosa leave to close?

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                        Adapted from the work of Ms. Foglia
Review Figure 39.1 and fill out the table below
  Hormone            Where Produced or Found in Plant        Major Functions




                       Adapted from the work of Ms. Foglia

								
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