Multiple choice

Why does a plant appear to bend towards light?

  1. Due to the diffusion of auxins towards the shady side of the shoot

  2. Due to the diffusion of gibberellins towards the bright side of the shoot

  3. Due to the diffusion of cytokinins towards the shady region of the shoot

  4. Due to the diffusion of gibberellins towards the shady region of the shoot

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A Correct answer
Explanation

When light is incident on 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.