how do you think the change in chlorophyll levels is a response to changes in the lenght of day from summer to fall

Chlorophyll absorbs sunlight for photosynthesis; therefore, plants that produce higher levels of chlorophyll in the summer will be advantageous because more is available when it is able to absorb more sunlight.This means it may use photosynthesis to produce more glucose, which is used by plants to achieve functions such as growth.