Uploaded November 2025 | Updated September 2026, 3 weeks ago
Why do tree leaves turn yellow and red in the autumn? Here is a partial answer. The yellow color was in the leaves all along, helping out with photosynthesis, while the red color was manufactured by the leaves as they grew older. Is there a reason for autumn leaves to have bright colors, or is it just a happy (to us human observers) accident?
Why do tree leaves turn yellow and red in the autumn? Here is a partial answer. The yellow color was in the leaves all along, helping out with photosynthesis, while the red color was manufactured by the leaves as they grew older. Is there a reason for autumn leaves to have bright colors, or is it just a happy (to us human observers) accident?
