| 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. |
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| Which concentration of sucrose solution has the same water potential as the cell sap? |
A) \[0.1mol\,d{{m}^{-3}}\]
B) \[0.25mol\,d{{m}^{-3}}\]
C) \[0.45mol\,d{{m}^{-3}}\]
D) \[0.6mol\,d{{m}^{-3}}\]
Correct Answer: C
Solution :
When the concentration of sucrose solution has the same water potential as the cell sap, there would be no net movement of water across the cell membranes of the plant tissue and there would be no change in the length of the strip. For the \[0.45mold{{m}^{-3}}\] sucrose solution, the ratip of initial length: final length was 1.0, which means that the length of the strip of plant tissue was unchanged.
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