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

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.