Dermal tissue covers the outer surface of herbaceous plants. Dermal tissue is composed of epidermal cells, closely packed cells that secrete a waxy cuticle that aids in the prevention of water loss. The ground tissue comprises the bulk of the primary plant body. Parenchyma, collenchyma, and sclerenchyma cells are common in the ground tissue. Vascular tissue transports food, water, hormones and minerals within the plant.
Vascular tissue includes xylem, phloem, parenchyma, and cambium cells.
Two views of the structure of the root and root meristem. Images from Purves et al. Plant cell types rise by mitosis from a meristem . A meristem may be defined as a region of localized mitosis. They function in storage, photosynthesis , and as the bulk of ground and vascular tissues.