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Its main function is storage. Vacuoles are found in the cytoplasm of most plant cells. They are membrane bound organelles, they perform functions of secretion, excretion and storage. Tonoplast: A vacuole that is surrounded by a membrane is called tonoplast.ell wall: The cell wall is a rigid layer that surrounds the plant cells. It is made up of cellulose. Cell wall is a characteristic feature to cells of plants. Plant cell walls are primarily made up of cellulose.
An organelle is a specialized part of the cell that serves a specific purpose within the cell. There are many organelles present within a cell and they also vary depending on what kind of cell we are talking about, whether it be a plant or animal cell. Here are a few of the organelles and their functions: 1  nucleus-this would be like the brain of the cell and gives direction to the rest of the cell. 2  cell membrane-this provides protection for the cell and allows material to enter and leave the cell. 3  vacuoles-these are used for storage of materials such as water.