Question

The curvature of shoots due to the action of auxin during the phototropic movement occurs:

• A. On the entire shoot tip
• B. At the shady side of the shoot
• C. Far away from the shoot tip
• D. At the sunny side of the shoot

Answer 1

The correct option is B At the shady side of the shoot

When growing plants detect light, a hormone called auxin, synthesised at the shoot tip, help the cells to grow longer. When light is coming from one side of the plant, auxin diffuses towards the shady side of the shoot. This concentration of auxin stimulates the cells to grow longer on the side of the shoot which is away from light. Thus, the plant appears to bend towards light.