August 28
How do plants move?
Most of us think plants don't move except by external forces (wind and such). But that is not true, the movement is just very slow and you have to sit next to a plant for a whole day to see it happening.
Think of flowers. They open when the sun comes up, generally follow the sun across the sky and close when the sun sets. This is not movement that is driven by growth. It is repeated every day.
So what "muscles" do plants have that allow for this movement?
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