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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.
Most parenchyma cells retain the ability to divide and differentiate into other types of plant cells under special condition. Parenchyma cell are the main representative of the ground tissues system found in all plant organ. The cells consist of isodiametric, thin walled and equally expanded cells. Parenchyma cells are variable in their morphology and carry on a variety of function in relation to their position in the plant. Living parenchyma cells found in all plant organs perform most of the metabolic function of the plant,synthesizing and storing various organic products.