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Hi I'm Radiant!Welcome to my science blog..I like to EAT and I love talkingandplayingand jokingandbeingcrazyand..you get the idea :D



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Wednesday, November 25, 2009

Transport in living things
- Diffusion
- Osmosis

Diffusion is the overall movement of molecules of a substance from a region of higher concentration to a region of lower concentration.
For example,in leaves,carbon dioxide enters the leaves through the stomata,moving into air spaces in the leaves.This is because the carbon dioxide concentration is higher outside the leaves than in the air spaces in the leaves.

Osmosis is the net movement of water molecules from a region of higher water concentration to a region of lower water concentration through a partially permeable membrane.A partially permeable membrane is a membrane that allows some molecules to pass through but not others.
For example,when a plant cell is being placed in a beaker full of salt solution,the water in the plant cell will move out into the salt solution by osmosis as the concentration of water in the cell is higher than in the salt solution.



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