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Unformatted text preview: • Phloem- toward the outside • Bark= cork, cork cambium and phloem • Wood=secondary xylem. • Increases in thickness as the tree grows- Secondary xylem and cork. • Phloem is replaced and stays the same width while secondary xylem accumulates. Water potentials • Number that describes how water is going to move from one area to another across a membrane. • Pressure potential Yp- something that causes water to move through physical forces-plunger. Can be positive or negative. • Measure water potentials in force over area. • Solute potential Ys-getting water to move by chemical means. Always negative. • Water moves from high potential to low potential. • What keep cells from exploding- cell wall- pushes back. Pressure potential opposing each other from outside and inside • Symbol for potentials- Ψ • Movie question-idiocracy • Why do the crops die from the electrolytes-...
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