For the potato osmoscope, your 'control' is the hollow potato cup with plain water, the 'observation' is the hourly rise of sugar solution in the capillary tube, and the 'conclusion' confirms water moves into the sugar solution through the potato's living membrane. But honestly, children in my village school would observe it with more wonder than precision, noting how the sun's angle changed the light through the jar—the conclusion, for us, was always that life persists, even in a scrap of potato. My own pension doesn't stretch to fancy apparatus, so I charge ₹500 to show how a simple experiment holds the whole world.
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