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3) Epidermal appendages, = The cells of epidermis bear a number of outgrowths. They are of 2 types:- Root hairs: They are unicellular elongations of the epidermal cells. Function: Help to absorb water and minerals from the soil., - Trichomes: They are the epidermal hairs on the stem. They are multicellular, branched or unbranched and soft or stiff. They may, be secretory. Function: Help in preventing water loss due to transpiration.