Biology-B1-Osmosis 5.0 / 5 based on 1 rating ? BiologyExchange of materialsGCSEAQA Created by: tonisha_Created on: 26-09-21 19:02 What is Osmosis? the movement of water molecules from a region of high water concentration to a region of low water concentration across a partially permeable membrane 1 of 22 What is a partially permeable membrane a membrane that has small holes in and only lets tiny molecules in 2 of 22 What is an example of a molecule that can pass? water 3 of 22 What is osmosis a type of? diffusion 4 of 22 PRACTICAL ------------------ What does this practical investigate? the effect of sugar solutions on plant tissues 5 of 22 What do you first do to the potato? cut it up into identical cylinders 6 of 22 Then what do we get? some beakers 7 of 22 What will these beakers contain? different sugar solutions 8 of 22 What must you make sure one has? pure water 9 of 22 What must you also make sure another has? concentrated sugar solution 10 of 22 What do you then do to the potato cylinders? measure their mass 11 of 22 How many do we put in each beaker? one 12 of 22 How long will we leave it in there? around 24 hours 13 of 22 What do we then do to the potatoes after 24 hours? dry them with a paper towel 14 of 22 then what do we measure? its mass again 15 of 22 If the potato has increased in mass, what does this mean? that it has drawn in water via osmosis 16 of 22 If it has decreased in mass, what does this mean? it has had water drawn out of it via osmosis 17 of 22 What is the independent variable? concentration of sugar solution 18 of 22 What is the dependent variable? potatoes mass 19 of 22 What are some examples of control variables? (3) volume of solution temperature sugar type 20 of 22 What are two examples of errors that may take place? potatoes arent fully dry water evapourated from beakers 21 of 22 How can we ensure a fair test? by repeating the investigation 22 of 22
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