When soaked in an isotonic solution, water will move ____ the Elodea cells.

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BlackTom AI · Accepted Answer

To analyze this question, I’ll consider what happens to plant cells like Elodea when placed in an isotonic solution.
Option 1: 'out of' — This would imply net water flow from the cell to the surrounding solution. In an isotonic solution, the external environment has the same osmotic pressure as the cell's interior, so there is no driving force for water to leave the cell. Therefore this option describes a hypothetically hypertonic situation, not isotonic.
Option 2: 'in and out in equal amounts of' — In an isotonic environment, water movement across the cell membrane reaches a dynamic equilibrium: water molecules move in and out, but there is no net gain or loss of water in the cell. This matches the definition of isotonic conditions for plant cells.
Option 3: 'into' — This would suggest net water influx into the cell, which would occur under hypotonic conditions when the outside solution is less concentrated than the cell’s interior. Isotonic solutions do not drive continuous inward flow.
Overall, the key concept is osmotic balance: isotonic solutions produce no net change in cell volume because the rates of water entering and leaving are equal, whereas other options describe non-isotonic scenarios leading to net movement in one direction.

When soaked in an isotonic solution, water will move ____ the Elodea cells.

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