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Diffusion and Osmosis SQA questions. W hat you should know - diffusion In diffusion, a substance will move ( d_____) from an area of h_____ concentration.

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Presentation on theme: "Diffusion and Osmosis SQA questions. W hat you should know - diffusion In diffusion, a substance will move ( d_____) from an area of h_____ concentration."— Presentation transcript:

1 Diffusion and Osmosis SQA questions

2 W hat you should know - diffusion 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___ G iffuse igh ow oodxygenarbonioxide atereave xchange aterialsxygen lucose ut C

3 Glucose and oxygen _______ by diffusion ___________ leaves the cell by _________ carbon dioxide enter diffusion

4 membrane = = = 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 utell electively mall ores glucose water starch

5 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_______ pecialiffusion ater ighaterowater electively embraneiskingubing

6 Examples of osmosis 1 Y X If a cell(X) with 5% glucose solution is surrounded by a 10% glucose solution(Y), in which direction will osmosis occur ? = 5% = 10%glucose Water moves ____ of cell from ___ to ____ because X has ___ % water (HWC) and Y has ___ % water (_____) out X Y95 90LWC

7 2 If cell(A) with 2% salt solution is next to a cell(B) with 1% salt, in which direction will osmosis occur ? A = 2% salt Water diffuses from cell B _____to cell A ____ by__________. Cell B has____% water Cell A has _____% water. osmosis HWC 99 LWC 98 X = 5% SALT 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 ___ equal 95 overall inout B = 1% salt Y = 5% SALT 3

8 C Osmosis in plant cells same water concentration low water concentration high water concentration No change Water ___ = Water inout lasmolysed Water e_____ the cell by o______. Vacuole swells up and cell becomes t______. The c___ w____ prevents b________ W_____ leaves the cell by osmosis. Vacuole s______ and the m_________ is pulled a___ from the cell wall. Cell is p__________. enters smosis urgid cellall ursting ater hrinks embrane way

9 C Osmosis in animal cells e.g. Red Blood Cells Animal cell behave differently due to the absence of a _______ cell wall high water concentration Animal cells gain water by ________ ________and ________ ___________ water ___ = water ___ no change same water concentratio n Cells _____ water by _______ and ______ lose osmosis shrink osmosis burst low water concentration in out b swell up

10 high concentration low concentration

11 Dissolved food oxygen carbon dioxide

12 Cell membrane osmosis

13 atmosphere Muscle cells diffusion osmosis

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15 0.9 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

16 osmosis 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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18 Shrink and wrinkle Swell up and burst lost higher

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20 Which is a turgid cell?

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22 allows exchange of materials /allows water to diffuse into root/ allows glucose to diffuse into cell /

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