Make the idea your own
- 1Compare solute counts in equal-sized compartments.
- 2Play the directional water-flow demonstration.
- 3Make both counts equal and observe no net flow.
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Class 9 · Biology
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NCERT chapter connection · Learning goals & preparation
By the end, you can…
- Explain Net water flow → higher solute concentration
- Change one input at a time and predict its effect before checking the model.
- Apply the relationship in a quiz and explain the reasoning behind your answer.
Useful preparation: Living and non-living things, cells and reading labelled diagrams.
Exploration · Cell: The Building Block of Life
NCERT ePathshala current chapter index · checked 12 Nov 2026. This activity explores part of the chapter; it does not replace the textbook. Open official NCERT reference ↗
Hands-on explainer · Class 9
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Class 9
CLASS 9 · CONCEPT QUEST
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Discover the rule, predict what happens, then solve a hands-on mission.
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The relationshipNet water flow → higher solute concentration
Explain the experiment
When the goal is met: The inside has the greater solute concentration, so net water movement is into the cell under the model assumptions.