BIOL 119 Chapter Notes - Chapter 38: Suberin, Hydrogen Bond, Apoplast
Document Summary
Water moves passively from roots to leaves- no expenditure of atp: occurs because of differences in potential energy of water. If water contains high concentration of solutes low solute potential compared to pure water: water moves down its potential gradient towards the region of higher solute concentration. Wall pressure- the force exerted by the wall. Turgor pressure- the pressure inside the cell: as water moves inside the cell, turgor pressure increases until wall pressure is induced. Turgid- cells that are firm and experience wall pressure. Turgor pressure counteracts the movement of water due to osmosis. Pressure potential- refers to any kind of physical pressure on water, can be positive or negative: negative- called tension. Water potential summarizes the stored energy that will tend to make water move. Selectively permeable membranes present- water moves by osmosis; areas of high solute potential to areas of low solute potential.
