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Ask where radioactivity goes. It is found in the xylem.
? Evidence of pulling:
? Cut stem and place cut portion of upper stem in water with dye. Dye moves up the stem in the xylem.
? Measure trunk diameter at the top and bottom of a tree over the course of a day. The top of the trunk shrinks before the bottom.
? Evidence that water is cohesive enough to withstand forces in the xylem: Place water in a capillary tube and spin in a centrifuge. Increase spin until the water in the column separates (bubble appears). Find that water can resist breaking equivalent to being pulled up a tree 1,000 feet tall (the tallest trees are 400 feet tall)
Experiments performed by Bohm, Dixon and Joly provided the evidence of the existence of cohesion...
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