Question
Describe chronologically the events that enable primary dicot root become secondary roots. Support your answer with suitable labeled diagrams.
Answer :
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The primary dicot root undergoes several chronological events to become a secondary root through secondary growth. Initially, the primary root consists of the epidermis, cortex, endodermis, pericycle, and the central vascular cylinder with primary xylem and phloem arranged in a radial pattern. The transition to secondary growth starts when the pericycle, especially the cells adjacent to the protoxylem poles, becomes meristematic and forms the vascular cambium ring. The vascular cambium originates from two sources: the fascicular cambium (derived from procambium between primary xylem and phloem) and
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