A student used two seedlings, X and Y, to investigate phototropism. The diagram illustrates the investigation. Which statement accounts for the difference in the results between X and Y?
- AThe piece of glass destroyed the auxin on the shaded side of the seedling.
- BThe piece of glass destroyed the auxin on the side of the seedling facing the light.
- CThe piece of glass in X stopped the auxin travelling down the shaded side of the seedling.
- DThe piece of glass in X stopped the auxin travelling down the side of the seedling facing the light.