KEGS Biology Blog

Monday 8th October Section 2
October 7, 2012, 10:14 pm
Filed under: Uncategorized

Osmosis and water potential


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Diffusion – the passive movement of a substance down a concentration gradient from an area of high concentration to an area of low concentration

Osmosis – a net movement of water molecules from a region of high concentration to a region of low concentration, through a semi permeable membrane (a membrane permeable to water and specific solutes).

Water potential starts at zero and goes down as the water potential becomes less – the more solute there is, the lower the water potential the lower the number is.

Ψ = Water Potential

Distilled H2O – Ψ0

Plasmolysis – where the cell membrane peels away from the cell wall

Crenation – Animal Cell shrinking (eg red blood cell),%252BIsotonic,%252BHypertonic.gif&w=800&h=490&ei=EoN0UKnoEaWi0QXrsIGABA&zoom=1&iact=hc&vpx=72&vpy=147&dur=4697&hovh=176&hovw=287&tx=131&ty=66&sig=116606023274912014267&page=1&tbnh=92&tbnw=151&start=0&ndsp=19&ved=1t:429,r:0,s:0,i:68

Comment by gautammenon1

Osmosis- net movement of water molecules across a partially permeable membrane, from an area oh ‘high water potential’ to an area of ‘low water potential’

Comment by roobennithi

using net instead of passive will get you the marks 🙂 so use rooben’s defintion

Comment by stefansoyombo

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