54 Re-examine your previously prepared celery petiole wet mount preparation and locate the vascular bundles containing xylem and phloem. The xylem will be the larger, thicker-walled cells facing toward the inside of the celery rib (the concave side) and the phloem will be the smaller cells in the vascular bundle facing the outside of the rib (the convex side). Draw and label your findings. Epidermaltissue - is the outermost cell layer of the plant body. It covers leaves, floral parts, fruits, seeds, stems and roots. The epidermis is generally one cell layer thick and composed mostly of unspecialized parenchyma cells. Most plants have parenchyma cells that are highly modified to form secretory cells, trichome (hair) cells, or gas-exchange regulating cells (guard cells). Would you predict that epidermal tissue would afford the plant lots or a little support? Why? Prepare an epidermal peel using from the upper or lower surface of the leaves provided (your instructor will demonstrate this for you).
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