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Cells are isodiametric, i.e. equally expanded on all sides. They may be oval, round, polygonal or elongated. Nucleus is present and hence, living. The cell walls are thin and made of cellulose. Cytoplasm is dense with a single large vacuole. Intercellular spaces may be present. Parenchyma which contain chlorophyll is called chlorenchyma.  It gives mechanical strength by maintaining turgidity and stores waste products like tanin, gum, crystals and resins.