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The movement of water across a selectively permeable membrane, like the plasma membrane of the cell, is called tonicity.

a. True
b. False

Answer :

b) False, The movement of water across a selectively permeable membrane, like the plasma membrane of the cell, is not called tonicity.

The correct term for this process is osmosis. Osmosis is the diffusion of water molecules from an area of higher water concentration to an area of lower water concentration across a selectively permeable membrane.

Tonicity, on the other hand, describes how an extracellular solution can change a cell's volume by affecting osmosis. Tonicity is related to the osmolarity of the solution, which impacts how water moves across the cell membrane, but it is not the process itself.

For example, if a cell is placed in a hypertonic solution (high solute concentration), water will move out of the cell, causing it to shrink. Conversely, in a hypotonic solution (low solute concentration), water will move into the cell, causing it to swell.

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