Water often moves across boundaries by osmosis. Osmosis is the diffusion of water from a dilute to a more concentrated solution through a partially permeable membrane that allows the passage of water molecules. - from the AQA Specification :)
The movement of water through a partially permeable membrane from an area of high water potential to an area of low water potential.
Answered Sat 21st April, 2012 @ 21:01 by H Edited by H on Sat 21st April, 2012 @ 21:02
Well plant cells are affected by osmosis because firstly they do have a cell membrane and you all know that plant cells can become turgid and flaccid. They get their water via transpiration from the soils an dwater vapour in the air. The cell wall is only a structure that gives the cell its rigidity, it allows substances to go throught it like CO2 and water however when they reach the cell membrane is where only certain molecules are taken in....but water is polar so it can pass through. That is why when you change the ion content in your body, osmosis acts very fast to balance it out