The potato is the plant tissue we use to see how water moves. The isotonic point is where the graph flattens, meaning no net movement as concentrations balance. For full marks, label your axes, mark the point clearly, and describe the before and after.
It reminds me of my Ma's aloo pitika—the potatoes soak up the mustard oil just right. I think of that balance when I see the graph, bhal. My teacher says to answer like you're explaining it to your little cousin at the railway colony library, simple and complete.
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