Evidence for Phototropism Due to the Asymmetric Distribution of Auxin

Multiple Choice

Evidence for phototropism due to the asymmetric distribution of auxin moving down the stem

A) has not been found in eudicots such as sunflower and radish.
B) has been found in all monocots and most eudicots.
C) has been shown to involve only IAA stimulation of cell elongation on the dark side of the stem.
D) can be demonstrated with unilateral red light, but not blue light.
E) is now thought by most plant scientists not to involve the shoot tip.