Answer: The correct answer is-
Leaves change colors in the fall because of the breakdown of green pigment called chlorophyll.
A green pigment (chlorophyll) is present in the leaves that is significant in the process of photosynthesis (formation of food using carbon dioxide and water in the presence of sunlight).
This pigment is broken down into small molecules during fall that results in the decoloration of leaves. The other pigments (such as carotenoid) exhibit their color on the leaves due to absence of chlorophyll.
In fall, the length of daylight is changed and there is an alternation in the temperature.
Leaves do not perform photosynthesis and change their color from green to orange or yellow due to lack of chlorophyll pigment.
