<Li> Epidermis (botany) </Li> <P> Parenchyma (para -' beside'; chyma -' in filling, loose, unpacked') is the bulk of a substance . In plants, it consists of relatively unspecialised living cells with thin cell walls that are usually loosely packed so that intercellular spaces are found between cells of this tissue . This tissue provides support to plants and also stores food . In some situations, a parenchyma contains chlorophyll and performs photosynthesis, in which case it is called a chlorenchyma . In aquatic plants, large air cavities are present in parenchyma to give support to them to float on water . Such a parenchyma type is called aerenchyma . </P> <P> Collenchyma is Greek word where "Collen" means gum and "chyma" means infusion . It is a living tissue of primary body like Parenchyma . Cells are thin - walled but possess thickening of cellulose, water and pectin substances (pectocellulose) at the corners where number of cells join together . This tissue gives a tensile strength to the plant and the cells are compactly arranged and have very little inter-cellular spaces . It occurs chiefly in hypodermis of stems and leaves . It is absent in monocots and in roots . </P> <P> Collenchymatous tissue acts as a supporting tissue in stems of young plants . It provides mechanical support, elasticity, and tensile strength to the plant body . It helps in manufacturing sugar and storing it as starch . It is present in the margin of leaves and resist tearing effect of the wind . </P>

Different kinds of tissues in the human body