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Diffusion and Osmosis SQA questions
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W hat you should know - diffusion
G In diffusion, a substance will move ( d_____) from an area of h_____ concentration to an area of l__ concentration Dissolved f___, o_____, c_____ d_____ and w_____ enter and l_____ the cell by diffusion Diffusion allows the e_________ of m________ e.g. o_______ and g________ move into cells and carbon dioxide moves o___ iffuse igh ow ood xygen arbon ioxide ater eave xchange C aterials xygen lucose ut
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Glucose and oxygen _______ by diffusion enter diffusion ___________
leaves the cell by _________ carbon dioxide enter diffusion
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The cell membrane c______ diffusion – the passage of substances i____ and o__ of the c___
The cell membrane is s_________ permeable – s______ molecules can pass through the p_____ in the membrane ontrols nto ut ell electively mall ores membrane = glucose = starch = water
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What you should know - osmosis
Osmosis is a s______ case of d_______ In osmosis w____ molecules move from a h___ w____ concentration to a l__ w____ concentration across a s__________ permeable membrane e.g. the cell m_________ or v______ t_______ pecial iffusion ater igh ater ow ater electively embrane isking ubing
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Water moves ____ of cell from ___ to ____ because X has ___ % water
Examples of osmosis If a cell(X) with 5% glucose solution is surrounded by a 10% glucose solution(Y), in which direction will osmosis occur ? 1 X Water moves ____ of cell from ___ to ____ because X has ___ % water (HWC) and Y has ___ % water (_____) out Y = 10%glucose Y 95 X = 5% 90 LWC
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In plant cells X and Y there is an ______concentration
2 If cell(A) with 2% salt solution is next to a cell(B) with 1% salt , in which direction will osmosis occur ? Water diffuses from cell B _____to cell A ____ by__________. Cell B has____% water Cell A has _____% water. HWC LWC osmosis A = 2% salt B = 1% salt 99 98 3 equal In plant cells X and Y there is an ______concentration water (___%) and therefore there is no net or ________ movement of water i.e. water ___ = water ___ 95 X = 5% SALT overall Y = 5% SALT in out
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Osmosis in plant cells C Water e_____ the cell by o______. Vacuole swells up and cell becomes t______. The c___ w____ prevents b________ enters smosis urgid high water concentration cell all ursting same water concentration No change Water ___ = Water in out low water concentration W_____ leaves the cell by osmosis. Vacuole s______ and the m_________ is pulled a___ from the cell wall. Cell is p__________. ater hrinks embrane way lasmolysed
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Osmosis in animal cells e.g. Red Blood Cells
Animal cell behave differently due to the absence of a _______ C cell wall Animal cells gain water by ________ ________and ________ osmosis swell up burst high water concentration ___________ water ___ = water ___ no change same water concentration in out low water concentration b Cells _____ water by _______ and ______ lose shrink osmosis
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high concentration low concentration
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Dissolved food oxygen carbon dioxide
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Cell membrane osmosis
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atmosphere Muscle cells diffusion osmosis
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0.9 Water has moved out of cell to a lower water concentration /
No gain or loss of water at this concentration / No osmosis at this concentration / No change to cells at this concentration / They look like the untreated cells Cells have shrunk or crinkled up or shrivelled up Water has moved out of cell to a lower water concentration / Water has moved out of cell down a concentration gradient
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osmosis oxygen / glucose / amino acid
water moved out of cell from a high to low water concentration / water moved to a lower water concentration outside the cell / water moved from a higher water concentration inside the cell oxygen / glucose / amino acid
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Shrink and wrinkle Swell up and burst lost higher
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Which is a turgid cell?
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allows exchange of materials /allows water to diffuse into root/ allows glucose to diffuse into cell /
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