When one plant is shaded by another,why is the ratio of far-red to red light increased compared to an unshaded plant?

Question

Quizplus · Accepted Answer

EWhen light passes through or is reflected off the leaves of plants, most of the red light, which is crucial for photosynthesis, is absorbed by chlorophyll. This leaves a higher proportion of far-red light in the shaded areas. Additionally, shaded environments are naturally enriched in far-red wavelengths because of this selective absorption by chlorophyll in the leaves of the shading plants. This is why plants in shaded conditions experience an increased ratio of far-red to red light.

When One Plant Is Shaded by Another,why Is the Ratio