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?

Question

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?

Quizplus · Accepted Answer

The data indicate that far-red light affects stem elongation, which is known to be regulated by phytochrome. Therefore, it is reasonable to hypothesize that shade plants do not respond to far-red light because they do not have phytochrome. It is less likely that the other options are the sole reason for the lack of response to far-red light because they are not directly involved in the phytochrome signaling pathway.

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