Strips of plant tissue were immersed in a range of sucrose solutions of different concentrations. Their lengths were measured before immersion and after 30 minutes in the different solutions.
The graph shows the ratio of initial length to final length.
Which concentration of sucrose solution, in $mold{m^{-3}}$, has the same water potential as the cell sap before immersion?
1 )
0.1
2 )
0.25
0.45
4 )
0.8
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