If You Observe a Plant That Has Its Stems Bend

Multiple Choice

If you observe a plant that has its stems bend toward the light and its roots bend down in response to gravity, you conclude that both responses

A) are mediated by the lateral redistribution of auxin.
B) involve phototropin.
C) involve the settling of amyloplasts.
D) sometimes cause growth in the direction of the stimulus (light or gravity) .
E) are known to involve a redistribution of abscisic acid.