The movement of auxin downward from its site of production is referred to as
A) gravitropism.
B) apical dominance.
C) nonpolar transport.
D) polar transport.
E) turgor movement.

Question

Quizplus · Accepted Answer

Auxin is a plant hormone that moves in a directional manner, specifically from the tip of the plant downward towards the base. This movement is known as polar transport because it occurs in a specific direction (from the point of synthesis towards the root). This is in contrast to nonpolar transport, which would imply movement in any or all directions without a specific polarity.

The Movement of Auxin Downward from Its Site of Production