If a 0.9% solution is isotonic to a certain type of animal cell, the cell will lose mass if it is placed in
which of the following liquids?
(1) 0.5% salt solution (2) 0.9% salt solution
(3) 1.2% salt solution (4) distilled (pure) water

The correct option is (3).

The 1.2% solution represents hypertonic solution as compared to the 0.9% solution of cell. Thus, water will move out of the cell by osmosis and result in shrinking of cell or loss of cell mass.

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