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movement of substances (OSMOSIS (the cell surface membrane is a partially…
movement of substances
DIFFUSION
the net movement of particles from an area of a higher concentration to an area of a lower concentration
the steeper the gradient, the faster the rate of diffusion
OSMOSIS
the cell surface membrane is a partially permeable membrane it only allows some substances to pass through
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turgor allows most leaves and young stems to remain erect due to pressure in their cells. the loss of turgidity can cause the plant to die
cells may die if plasmolysed for too long. to reverse plasmolysis, add water to dilute hypertonic soil solution
osmosis is the net movement of water molecules from an area of a higher water potential to an area of a lower water potential through a partially permeable membrane
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ACTIVE TRANSPORT
active transport is the process in which energy is used to move particles of a substance against a concentration gradient,that is, from a region where they are of lower concentration to a region to where they are of a higher concentration
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as cells become bigger, the ratio decreases
greater the surface area to volume ratio, the larger the rate of diffusion