UNI Plant Physiology 2010www.uni.edu/berg What we now know On freezing nights –Ice forms between cells, attracting water –Sap rises in xylem to replace water in cells On thawing days –Ice melts –Liquid water flows back into cells & sugary xylem –Pressure increases in xylem –Sap flows out the hole into the pipe into the bucket into the sugar shack into the bank account
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