Sad in a forest in autumn: fade the flowers, the leaves on the trees turn yellow, dry and fall off. The days are getting shorter, sunlight - less. With the arrival of autumn chlorophyllose grains in the leaves disappear, and with their disappearance changing the color of the leaves: they turn from green to yellow or red. The fact that the leaves turn yellow, red or brown color, due to the fact that, in addition to chlorophyllose particles in the leaves contains carotenoids are red, orange and yellow pigments. When chlorophyllous particles disappear, remain carotenoids, so the leaves change color.