Final answer:Placing celery sticks in fresh water makes them more swollen and rigid due to osmosis, where water molecules move from an area of high water concentration to low concentration across a permeable membrane.Explanation:When celery sticks are placed in fresh water, they become more swollen and rigid because of a process called osmosis. Osmosis is the movement of water molecules from an area of high water concentration to an area of low water concentration, across a permeable membrane.In this case, the fresh water has a higher water concentration compared to the celery sticks. As a result, water molecules move into the celery cells, causing them to swell and become more rigid.For example, if you place a celery stick in a glass of fresh water, you may observe that it becomes crisp and firm after some time.Learn more about Osmosis in celery sticks here:brainly.com/question/31936894...

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