Photosynthesis is that plant process is affected most during this darkness because photosynthesis only occurs when there is sunlight.
Photosynthesis is a process in which water and carbondioxide combine in the presence of sunlight and produce glucose and oxygen. We know that Photosynthesis occurs only at daytime.
So we can conclude that Photosynthesis is affected during this darkness because photosynthesis only occurs when there is sunlight.
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