Figure 39.1 -The Data in Figure 39.1 Were Taken from a Study

question 19

Multiple Choice

Figure 39.1

-The data in Figure 39.1 were taken from a study on the effects of far-red light on stem elongation.The data indicate that plants from shady habitats do not respond to far-red light by growing taller.Which of the following would be a logical hypothesis for why these plants do not respond to far-red light?

• A)The shade plants do not have phototropin.
• B)The shade plants do not have protein kinases.
• C)The shade plants do not have cryptochromes.
• D)The shade plants do not have phytochrome.
• E)All of these are reasonable hypotheses.

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