why are bananas yellow?


Sunlight, containing all visible colors, strikes a banana. Our eyes perceive color through photoreceptor cells called cones, which are sensitive to red, green, and blue light. Unripe bananas appear green due to the presence of chlorophyll, a pigment that absorbs most light wavelengths but reflects green. As the banana ripens, it releases ethylene, a hormone that triggers the breakdown of chlorophyll. Simultaneously, the banana begins producing carotenoids, pigments that absorb blue-green light and reflect yellow and orange. Consequently, as the green chlorophyll fades and the yellow carotenoids become dominant, the ripe banana reflects primarily yellow light. This reflected yellow light stimulates the red and green cones in our eyes, and our brain interprets the combined signals as the color yellow.
why?