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If a plant cell is placed in deionised water, the water potential of that cell becomes

1. More positive because pressure potential becomes more positive
2. More positive because pressure potential becomes more negative
3. More negative because pressure potential becomes more negative
4. Less negative because pressure potential becomes more positive

Correct answer: Less negative because pressure potential becomes more positive

Solution

Deionised water has a higher water potential than the cell, so water enters by osmosis. This increases the cell’s pressure potential (turgor), which makes the cell’s overall water potential less negative.

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