The potato is the living tissue whose cells act as semi-permeable membranes; the isotonic point on the graph is where the sucrose concentration causes no net water movement, so the potato cylinder's mass change is zero. To get full marks, label your axes, plot points accurately, and clearly state the isotonic concentration from your graph's x-intercept. I see students lose marks by forgetting that the potato *is* the experimental material, not just an ingredient—it reminds me of how we overlook what's foundational, like my hip making me rethink a whole career while everyone else saw just a man sitting still.
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