A level biology

The student wanted to determine the water potential of chicken eggs. She:
• produced a dilution series of sugar solution
• followed the procedure described on page 20.
She calculated the final mass to initial mass ratio of the egg covered in each sugar
solution.
How would you advise the student to use her calculated ratios to determine the water
potential of the eggs?
In your answer state the independent variable in the student’s investigation

Water moves from a high to low water potential. You want the isotonic point, between the 2 values with a mass increase and mass decrease. The water potential will be inbetween. In order to find this, plot a graph. On Y axis, % mass change (include + and -). X axis - sugar solution concentration. I drew a diagram to help.

Sorry instead of % mass change on Y axis, use mass ratio