Date of publication: 2017-08-24 00:51
Osmosis is a type of diffusion involving water molecules and a semi-permeable membrane. They move from areas of "high water concentration", such as dilute solutions of say, sugar, to areas of "low water concentration", such as concentrated solutions of sugar, until there is an equal concentration of water molecules on both sides. There are three types of solution (and, thus, osmosis):
Osmosis is important to plants. They gain water by osmosis through their roots. Water moves into plant cells by osmosis, making them turgid [ turgid : Having turgor enlarged and swollen with water ] or stiff so that they are able to hold the plant upright.
Water concentration outside the cell is equal to concentration inside the cell. Water still passes through the cell membrane, but the net movement is 5.
This is shown in the animation above. Eventually the level on the more concentrated side of the membrane rises, while the one on the less concentrated side falls. When the concentration is the same on both sides of the membrane, the movement of water molecules will be the same in both directions. At this point, the net exchange of water is zero and there is no further change in the liquid levels.
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