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Q.
A cell when dipped in 0.5 M sucrose solution has no effect but when the same cell will be dipped in 0.5 M NaCl solution the cell will
Transport in Plants
Solution:
When the cell is dipped in 0.5 M sucrose solution it has no effect because the solution is isotonic, but in 0.5 M NaCl solution the cell size will decrease because solution is hypertonic in comparison to the cell sap, so water will move out of the cell. The reason behind this is that although both sucrose and NaCl solutions are of same molarity yet they differ in osmolarity. NaCl completely dissolves in water and forms two types of solutes. Thus 1 M NaCl is equal to 20 cm solution (osmole). Hence osmolarity of 0.5 M will be twice of that of 0.5 M sucrose solution.