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  4. In a mature dicot stem which has undergone secondary growth, youngest layer of secondary xylem is situated

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Q. In a mature dicot stem which has undergone secondary growth, youngest layer of secondary xylem is situated

Anatomy of Flowering Plants

Solution:

The cambial ring present between primary xylem and primary phloem becomes active and begins to cut off new cells, both towards the inner and the outer sides. The cells cut off towards pith mature into secondary xylem and the cells cut off towards periphery mature into secondary phloem.