DOST Science Practice Exam 2026 – All-in-One Study Guide to Master the Test!

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If a cell is placed in isotonic solution, what is the net movement of water?

Water moves into the cell

No net movement

In an isotonic solution, the solute concentration outside the cell is the same as inside the cell. Because the water potential on both sides is balanced, water still crosses the membrane, but the amount moving in equals the amount moving out. This equal exchange means there’s no overall change in the cell’s volume, so there is no net movement of water. Cells in isotonic environments therefore maintain their size and shape.

So, the net movement of water is zero.

Water moves out of the cell

Both directions equally

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