How do planted seeds know which was is up?
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Plants are made of cells. A plant cell is like a cardboard box with water-filled bag in it. Floating in the water is a chemical plant that pumps out chemicals. Some of the chemicals leak into nearby cells. Some sink in water, and some float. The sinkers fall to the bottom and the floaters to the top. The sinkers are a chemical message that says: “become roots!” and the floaters “become a stalk and leaves!”.
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