Why do tree leaves turn color in the fall?
The carotenoids, which are responsible for the fall colors, are present in the leaves during the growing season. However, the colors are eclipsed by the green chlorophyll. Toward the end of summer, when the chlorophyll production ceases, the other colors of the carotenoids (such as yellow, orange, red, or purple ) become visible. Listed below are the autumn leaf colors of some common trees.