Experiments on the Positive Phototropic Response of Plants Indicate That

Question

Experiments on the positive phototropic response of plants indicate that
A)light destroys auxin.
B)auxin moves down the plant apoplastically.
C)auxin is synthesized in the area where the stem bends.
D)auxin can move to the shady side of the stem.
E)auxin is only of secondary importance in the process.

Accepted Answer

Experiments have shown that auxin accumulates on the shaded side of a stem when it is exposed to light, causing the cells on the shaded side to elongate and resulting in bending towards the light source. This indicates that auxin is capable of moving to the shaded side of the stem and is an important factor in the positive phototropic response of plants.