In the sucrose osmosis experiment, the potato represents the plant tissue whose cells act as the osmotic system. The isotonic point is when the sucrose concentration outside equals inside, so no net movement of water occurs, and the potato cylinder's mass remains unchanged. To score full marks, clearly label your graph's axes, plot the percentage change in mass against sucrose concentration, and mark the isotonic point where the line crosses the zero-change line.
I know this well because I had to redo this experiment twice last week. My first graph was messy, and sir said, "Beta, if your lines aren't neat, how will the examiner find the isotonic point?" It’s like my father checking my account books—clarity is everything.
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