Why do leaves change their colour in the fall season?
The leaf's colour change as per season, when temperatures drop and days become shorter, leaves can not get enough sunlight those days, and the lack of chlorophyll creates yellow and orange pigments of photosynthesis. They are released in chloroplasts in photosynthetic tissues of the leaves.
Leaf colour pigments:
1. Chlorophyll: Green.
2. Xanthophyll: Yellow.
3. Carotene: Gold, Orange.
4. Anthocynin: Red, Violet
Which are mainly three pigments found in Plants. In mainly sunny countries plants' leaves are in green colour. When windy and cold countries plants are in different colours like yellow and orange.