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Vacuoles are present in both animal and plant cells. The contractile vacuoles of protozoan enlarge by accumulating fluids and collapse by expelling them from the cell. Vacuoles are particularly large and abundant in plant cells. These are sap-filled vesicles in the cytoplasm, covered by a membrane called the tonoplast. The vacuolar sap often contains minerals, sugars, amino acids, proteins, esters, and water-soluble pigments, waste products in solution or as crystalline deposits. The large vacuoles are formed by the union of smaller vacuoles during the plants’ growth and development. Vacuoles serve as sites for the storage of water and cell products or metabolic intermediaries.


Plant Cell - Central Vacuole


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