Celery stalks that are immersed in fresh water for several hours become turgid (stiff). Celery stalks left in a 0.15 M salt solution become flaccid (limp). From this we can deduce that

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When celery stalks are immersed in fresh water, water flows into the cells by osmosis, causing the cells to expand and become turgid. This suggests that the solution outside the cells is hypotonic compared to the inside of the cells. Conversely, when celery stalks are immersed in a salt solution, water flows out of the cells by osmosis, causing the cells to shrink and become flaccid. This suggests that the solution outside the cells is hypertonic compared to the inside of the cells. Therefore, the fresh water is hypotonic and the salt solution is hypertonic to the cells of the celery stalks.

Celery Stalks That Are Immersed in Fresh Water for Several