The hormone responsible for cell differentiation, particularly xylem and phloem, in the roots is:

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Auxin is the hormone responsible for cell differentiation, particularly xylem and phloem, in the roots. It stimulates elongation and growth of cells, and also regulates the development of root systems. Gibberellins promote cell elongation, ethylene regulates senescence and fruit ripening, abscisic acid regulates stomatal closure and drought tolerance, and cytokinins regulate cell division and differentiation in various tissues.

The Hormone Responsible for Cell Differentiation, Particularly Xylem and Phloem