Water_1 - Cellular and Plant Water Relations Pages 341-351...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Cellular and Plant Water Relations Pages 341-351 A.Movement of water through membranes (OSMOSIS) 1. OSMOSIS : the diffusion of water through a selectively permeable membrane 2. Diffusion occurs down a potential energy potential gradient (i.e. from a region of high potential energy to a region of low potential energy). a) Examples: (1) Water diffuses from (a) warm to cold (b) high humidity to low humidity (c) high pressure to low pressure (d) low solute to high solute 3. Water Potential ( Ψ w) is measure of potential energy of water a) By convention, the water potential of pure water set at zero (0) b) Water potential is measured in pressure units and is expressed in bars or in Megapascals (MPa) (1) 1 bar = atmospheric pressure at STP (14.7 psi) (2) 1 bar = .1 MPa 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
(3) Inflated tires = 2 bars or 0.2 MPa (4) 10 meters under water the pressure is 0.1Mpa c) Water potential has three major components (1) Osmotic potential ( Ψ s) of a solution has a (-) value because the water is less concentrated than
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/25/2011 for the course BOTANY 206 taught by Professor Wood during the Fall '09 term at Broward College.

Page1 / 5

Water_1 - Cellular and Plant Water Relations Pages 341-351...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online