A group of students set up an experiment to investigate growth responses in plants.
In one of the experiments, they placed a plant shoot in a box with a small window allowing light to fall on one side of the shoot only.
Which of the following options correctly describes and explains what happened in the student’s experiment?
response |
cause |
effect |
|
A |
positive phototropism | more auxin on side of shoot exposed to light | slower growth on shaded side of shoot |
B |
positive phototropism | more auxin on shaded side of shoot | slower growth on side of shoot exposed to light |
C |
negative gravitropism | even distribution of auxins | equal rates of growth |
D |
positive phototropism | less auxin on shaded side of shoot | faster growth on side of shoot exposed to light |
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