Grass shoots bend toward the light because, on the shadowed side, a(n)
A)reduction in auxin levels promotes cell elongation.
B)reduction in auxin levels prevents cell elongation.
C)increase in auxin levels promotes cell elongation.
D)increase in auxin levels promotes cell division.

Question

Quizplus · Accepted Answer

Auxin is a plant hormone that promotes cell elongation. When the grass shoot is shaded, the concentration of auxin on the shaded side decreases, leading to a lower rate of cell elongation. On the brighter side, the concentration of auxin increases, leading to a higher rate of cell elongation and the bending of the shoot towards the light source.

Grass Shoots Bend Toward the Light Because, on the Shadowed