Note the pits in the walls of both of these cells and the large holes (perforation plates) on the ends of the vessel element only. Draw a cross section of the celery petiole, labeling parenchyma in th...Note the pits in the walls of both of these cells and the large holes (perforation plates) on the ends of the vessel element only. Draw a cross section of the celery petiole, labeling parenchyma in the epidermis, collenchyma in the cortex, and sclerenchyma in the vascular tissue. For example, the epidermis is a collection of parenchyma-like cells working together to separate the internal environment of the plant from the exterior.
