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
|