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 |