Why do some leaves turn yellow in autumn, while others turn red? • Leaves contain various coloured pigments. The pigments carotene (orange), xanthophyll (yellow) and chlorophyll (green) are found in ...

Autumn is a big time for trees. Many shed their leaves, and of course, before the leaves fall, they can turn brilliant colors. One of those colors has generated a lot of heated debate among scientists ...

As leaves die in the fall, color pigments form from sugars trapped in the leaves, producing the different red and yellows and oranges and purples. Bill Kreiger, professor of earth sciences and science ...