
During winter, there is not enough light or water for photosynthesis. The trees will rest, and live off the food they stored during the summer. They begin to shut down their food-making factories. The green chlorophyll disappears from the leaves. As the bright green fades away, we begin to see yellow and orange colors. Small amounts of these colors have been in the leaves all along.We just can't see them in the summer, because they are covered up by the green chlorophyll. Leaves are nature's food factories. Leaves are nature's food factories. They take a gas called carbon dioxide from the air. Plants use sunlight to turn water and carbon dioxide into oxygen and glucose.

Oxygen is a gas in the air that we need to breathe. Glucose is a kind of sugar. Plants use glucose as food for energy and as a building block for growing. The way plants turn water and carbon dioxide into
oxygen and sugar is called photosynthesis. That means "putting
together with light. A chemical called chlorophyll helps make
photosynthesis happen. Chlorophyll is what gives plants their
green color. As summer ends and autumn comes, the days get shorter and shorter. This is how the trees "know" to begin getting ready for winter
oxygen and sugar is called photosynthesis. That means "putting
together with light. A chemical called chlorophyll helps make
photosynthesis happen. Chlorophyll is what gives plants their
green color. As summer ends and autumn comes, the days get shorter and shorter. This is how the trees "know" to begin getting ready for winter