why do plant cells possess large sized vacuole?

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Plant cells have a large vacuole due to the amount of water the cell must hold to maintain its shape. The water in the vacuole creates something called turgor pressure. When the vacuole has lots of water, the turgor is high and pushes against the cell wall so the cell is rigid. When vacuole has little water, the turgor is low so the cell is flaccid. 

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Plant cells are known to have bigger vacuoles than animal cells because they need to store water. This is because the plant doesn't have the ability to move freely to a water source. The vacuoles also store food.

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