The environmental stimulus that causes leaves on certain trees to change color in autumn is the shortened daylight hours and cooler temperatures that occur as the seasons change from summer to fall.
During the spring and summer months, leaves on deciduous trees produce chlorophyll, the pigment that gives leaves their green color. Chlorophyll helps the tree to absorb sunlight and use it to convert carbon dioxide and water into glucose through the process of photosynthesis. As the days become shorter and the temperatures cool in the fall, the tree begins to prepare for winter by shutting down its production of chlorophyll. As the chlorophyll breaks down, the other pigments in the leaves, such as carotenoids (which give leaves their yellow and orange colors) and anthocyanins (which give leaves their red and purple colors), become more visible.
This process of leaf color change is known as autumnal leaf coloration or fall foliage. It is a natural and annual occurrence that occurs in many deciduous trees and is triggered by the changes in daylight hours and temperatures that occur as the seasons change from summer to fall.
Learn more about Deciduous Trees here:
https://brainly.com/question/5052077
#SPJ4
