View source for GCSE Biology Required Practical: Osmosis in Plant Tissue

==Key Stage 4==
===Meaning===
Investigate the effect of the [[concentration]] of [[sugar]] [[solution]] on the [[mass]] of [[plant]] [[tissue]].
===Method===
*[[Independent Variable]] - The concentration of [[sugar]] [[solution]].
*[[Dependent Variable]] - The [[mass]] of [[plant tissue]] at the end.
*[[Control Variable]]s - Volume of plant tissue. Surface area of plant tissue. Length of time the plant tissue is left in solution. Temperature of the solution.
#Cut 11 equal volumes of plant tissue (potato).
#Dry the plant tissue with paper towel and measure the mass of each piece, noting it down.
#Use a [[Measuring Cylinder]] to measure 10cm<sup>3</sup> of 1.0M [[sugar]] [[solution]] and pour it into a [[Boiling Tube]].
#Repeat step 3 with 9cm<sup>3</sup> of [[sugar]] [[solution]] and 1cm<sup>3</sup> of distilled water to give 0.9M [[sugar]] [[solution]], then 8cm<sup>3</sup> and 2cm<sup>3</sup> of distilled water to give 0.8M [[sugar]] [[solution]], repeating this pattern until there is 10cm<sup>3</sup> of 0.0M [[sugar]] [[solution]].
#Place one piece of plant tissue into each of the 11 [[Boiling Tube|boiling tubes]] leaving them for 12-24 hours (ensuring it is the same time for all).
#Remove the pieces of plant tissue, drying them with a paper towel and measure their [[mass]].
#Plot a graph showing the concentration of [[sugar]] [[solution]] on the x-axis and the change in [[mass]] of plant tissue on the y-axis.