Fig. 2.

Comparison of root and shoot cross-sections highlighting differences in the anatomical arrangement of primary and secondary tissues of annual dicots. Shoot tissue is characterized by having a thin cortex, vascular bundles encircling a central pith with a cambium alternating between fascicular and interfascicular regions. Contrastingly, roots have their vasculature arranged into a central stele with a vascular cambium that produces new xylem and phloem continuously throughout the entire circumference. Images of cross-sections are from root and stem tissue of common bean (Phaseolus vulgaris). All cross-sections are at the same scale. Scale bars = 0.5 mm.