A 10% glucose solution is placed in the thistle tube. The thistle tube is placed in a beaker that contains a 5% glucose solution. There is a differentially permeable membrane across the broad end of the tube, which is permeable to water but not to the sugar glucose. As diffusion occurs:

the 10% solution will become less concentrated and the 5% solution will become more concentrated.

Explanation:

Two glucose solutions with different concentrations of glucose are separated from each other by a differentially permeable membrane. Glucose can not cross the membrane but water can diffuse through it. Therefore, water will move from the 5% glucose solution towards the 10% glucose solution as the former has more amount of water in it. This will make the 5% solution more concentration due to the movement of water from it. The 10% solution will become less concentrated as water will enter into it.

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