How do plants know when it’s Autumn? How do leaves know when to turn red and fall off?
In: Biology
They react to changes in the air and changes in the amount of sunlight they’re getting.
They don’t have a brain to think and go “ok yes right now is the time to start dropping leaves”
Instead there are chemical reactions and processes that get triggered by a sustained drop in temperatures as well as the lower sunlight they get due to the shortening days.
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