Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a 0.15 M salt solution become limp and soft. From this we can deduce that

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When the celery stalks are immersed in fresh water, water moves into the cells through osmosis causing them to become stiff and hard. This indicates that the cells of the celery stalks have a lower concentration of water compared to the fresh water, making it hypotonic. On the other hand, when the celery stalks are left in a 0.15 M salt solution, water moves out of the cell causing them to become limp and soft. This indicates that the cells of the celery stalks have a higher concentration of water compared to the salt solution, making it hypertonic. 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