Answer :
In the absence of light, the production of chlorophyll-a molecules stops and they get broken slowly.
Chlorophyll is a condition that is characterized by a green pigment that the plant uses to manufacture food. So when light is not available, the process of making food is incomplete, and the chlorophyll disappears. This changes the color of the leaf gradually to light green. During this process, the xanthophyll and carotenoid pigments become predominant, causing the leaf to become yellow.
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