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HOW IS STRUCTURE OF ROOT FORMED ?
The roots are the beginning of the vascular system pipeline that moves water and minerals from the soil up to the leaves and fruits.  Roots make up around one-fourth to one-third of the total dry weight of a plant.
    Epidermis – The outer layer of cells.
    Root hairs – Absorptive unicellular extensions of epidermal cells of a root.  These tiny, hair-like structures function as the major site of water and mineral uptake.  Root hairs are extremely delicate and subject to desiccation.  Root hairs are easily destroyed in transplanting.      

            
    Cortex – Primary tissues of a root bound on the outside by the epidermis and on the inside by the endodermis.  In a carrot, the cortex becomes a storage organ.

    Endodermis – A single layer of cells in a root that separates the cortex tissues from the pericycle.

    Pericycle – A layer of cells immediately inside the endodermis.  Branch roots arise from the pericycle.

    Vascular system – Bundle of xylem and phloem tissues

    Phloem tssue conducts products of photosynthesis from leaves throughout plant including down to the roots
Xylem tissue conducts water and minerals up from the roots up through the plant


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