Question

Why do raisins shrink although they have a rigid cell wall?

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Answer

When raisins are placed in a sugar solution, they shrink and wilt due to a process known as exosmosis. This occurs because the concentration of water inside the raisin cells is higher than the concentration of water in the sugar solution, making the sugar solution a hypertonic solution. During exosmosis, water moves from an area of higher concentration inside the raisin cells to an area of lower concentration in the sugar solution, resulting in the cells losing water and shrinking. Despite having a rigid cell wall, the loss of water from the cells causes the overall structure of the raisins to shrink.


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