The Correlation. Correlation is a measue of how close the line fits the points that you found in your experiment. Anyone can say whether they think the line is a good fit or not, but to measure it exactly, we use the correlation coefficient: R2.
As the seasons change and the amount of sunlight decreases, less chlorophyll is produced, and the leaves appear less green. Chlorophyll is broken down into simpler compounds at a constant rate, so green leaf color will gradually fade as chlorophyll production slows or stops.
Photosynthesis, the chemical reaction that allows plants to use sunlight to manufacture food, plays an important role in color change for tree leaves. During seasons of growth, chlorophyll is constantly produced and broken down, leaving a green color on leaves.