You expose a plant to a light that shines on the right side of a plant. Which statement best explains why the plant grows toward the light?
A) Light destroys auxin, and thus the shaded side grows faster.
B) Auxin moves from the shaded side to the lighted side where it stimulates growth.
C) Auxin moves from the lighted side to the shaded side where it stimulates growth.
D) Light destroys auxin and thus the lighted side grows faster.
E) Auxin moves from the shaded side to the lighted side where it inhibits growth.

Question

Quizplus · Accepted Answer

Auxin, a plant hormone, moves from the lighted side to the shaded side of the plant. In the shaded side, auxin concentration increases, promoting cell elongation and thus causing the plant to grow toward the light. This phenomenon is known as phototropism.

You Expose a Plant to a Light That Shines on the Right