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Plants stop producing chlorophyll when the temperature drops, because there is less light in the winter it makes more sense to use food storage then continue using energy to produce chlorophyll and continue photosynthesis.

The reason for color change in the leaves are the other pigments present in plant leaves, which only show once chlorophyll production stops. These include carotenoids (yellow orange brown) and Anthocyanins (reds).

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Q: What happens to chlorophyll when temperatures drop?
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