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2.4.3 Osmosis. Osmosis . Movement of water molecules from a high concentrated area (dilute solution) to a low concentrated area (concentrated solution) through a semi permeable membrane. It is diffusion of water. Protein molecule. Water molecule. Semi permeable membrane. Outside the leaf.

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Osmosis
Osmosis

  • Movement of water molecules from a high concentrated area (dilute solution) to a low concentrated area (concentrated solution) through a semi permeable membrane. It is diffusion of water.


Steps in osmosis

Protein molecule

Water molecule

Semi permeable membrane

Outside the leaf

Inside the Leaf

Steps in Osmosis

Where is water more?

Inside or outside the cell?

Water will also diffuse from

where it is more to where it is less.

Therefore when water is more outside

than inside the cell, it will move inside

It can also move out of the cell

if there is more water inside the

Than outside


Osmosis continued
Osmosis continued

Salt water

Outside the leaf

Inside the Leaf

Now you placed this leaf in

Salt solution. What would happen

To the water?


This is what cells would look like in different conditions plant cell
This is what cells would look like in different conditions: Plant cell

  • When water moves out of cell:

http://www.youtube.com/watch?v=qucTUoHAeuY&feature=related

http://www.youtube.com/watch?v=gWkcFU-hHUk

http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html



Importance of water potential gradient
Importance of water potential gradient Plant cell

  • Where there are free water molecules – this is where the water potential is high (because it is able to move freely)

  • Concentrated solutions have low water potential

  • Dilute solutions have high water potential

  • Osmosis:

    the net diffusion of water molecules from a region of high water potential to a region of low water potential through a partially permeable membrane.


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