Red leaves occur when there is a high level of glucose in the leaf. Glucose is a sugar produced by photosynthesis. So think of the bright red leaves of a maple tree. Maples are full of sap, which is made out of clucose. Plants use glucose for food. When fall comes and the temperature drops, photsynthesis stops and the glucose becomes trapped in the leaf. Bright sunlight and cooler nights turn the glucose into a bright red or sometimes purple color.
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