<Ol> <Li> Pith </Li> <Li> Protoxylem </Li> <Li> Xylem I </Li> <Li> Phloem I </Li> <Li> Sclerenchyma (bast fibre) </Li> <Li> Cortex </Li> <Li> Epidermis </Li> </Ol> <Li> Sclerenchyma (bast fibre) </Li> <P> The ground tissue of plants includes all tissues that are neither dermal nor vascular . It can be divided into three types based on the nature of the cell walls . 1) Parenchyma cells have thin primary walls and usually remain alive after they become mature . Parenchyma forms the "filler" tissue in the soft parts of plants. usually present in cortex, pericycle, pith, and medullary rays in primary stem and root . 2) Collenchyma cells have thin primary walls with some areas of secondary thickening . Collenchyma provides extra structural support, particularly in regions of new growth . 3) Sclerenchyma cells have thick lignified secondary walls and often die when mature . Sclerenchyma provides the main structural support to a plant . </P> <P> Parenchyma (/ pəˈrɛŋkɪmə /; from Greek παρέγχυμα parenkhyma, "visceral flesh" from παρεγχεῖν parenkhein, "to pour in" from παρα - para -, "beside", ἐν en -, "in" and χεῖν khein, "to pour") is a versatile ground tissue that generally constitutes the "filler" tissue in soft parts of plants . It forms, among other things, the cortex and pith of stems, the cortex of roots, the mesophyll of leaves, the pulp of fruits, and the endosperm of seeds . Parenchyma cells are living cells and may remain meristematic at maturity--meaning that they are capable of cell division if stimulated . They have thin but flexible cellulose cell walls, and are generally polyhedral when close - packed, but can be roughly spherical when isolated from their neighbours . They have large central vacuoles, which allow the cells to store and regulate ions, waste products, and water . Tissue specialised for food storage is commonly formed of parenchyma cells . </P>

What is the difference between parenchyma collenchyma and sclerenchyma
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