Please bring dry pastel, charcoal and compressed charcoal, pencils, eraser, putty rubber, fixative or hairspray.
The root differs from the shoot in the characters of its surface tissues, in the absence of the green assimilative pigment chlorophyll, in the arrangement of its vascular system and in the mode of growth at the apex, all features which are in direct relation to its normally subterranean life and its fixative and absorptive functions.