Chlorophyll is a pigment found in the leaves of most plants, specifically in the chloroplast, a specialized part of a leaf cell. When a leaf is exposed to sunlight, the chlorophyll absorbs red and blue wavelengths of energy and reflects the green wavelengths. This is the actual reason for the leaves appearing to have a green color. In the autumn, as the chlorophyll ceases to reflect the green, the leaves then stop having a green color. Other pigments found in leaves are then able to reflect other colors, such as the oranges, reds, and browns observed in fall leaves.
As the chlorophyll absorbs the energy from the red and blue wavelengths, that energy begins the process of photosynthesis within the cells.
the colour of the leaves is green due to the chorophlly present in it