The autumnal colours of a tree’s leaves can be beautiful, when greens change to rich reds, but why does it actually happen? Photosynthesis is the process trees (and plants) use to make their food. Using energy from the sun, water from the ground, and carbon dioxide from the air, they make glucose which they use for energy and growth.
Photosynthesis happens in the leaves of plants, because they contain chlorophyll. Chlorophyll is also what makes leaves green. As long as there are plenty of daylight hours, the leaves can absorb enough energy from the sun for photosynthesis to take place. This means the leaves on the tree stay green.
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