Which occurs in the roots of dicots: primary or secondary growth?
Both primary and secondary growth in roots of dicots. but only primary growth occurs in roots of monocots
Primary occurs in roots of both dicots (plants bearing dicotyledonous seeds) and monocots (plants bearing monocotyledonous seeds).
Primary growth occurs due to the activity of root apical meristem, a primary meristem. Primary growth involves elongation in length.
Secondary growth involves increase in the girth or diameter of root. It occurs due to the activity of vascular cambium and cork cambium, which are secondary meristems.
Vascular cambium and cork cambium are present in dicots and not in monocots.
Thus secondary growth in root can occur only in dicot root and not in monocot root.