A) Differentiation of procambium followed by primary phloem and then primary xylem
B) Differentiation of procambium, xylem and phloem simultaneously
C) Differentation of procambium followed immediately by the development of secondary xylem and phloem
D) Differentiation of procambium followed by the development of xylem and phloem
Correct Answer: D
Solution :
Vascular tissues, xylem and phloem are differentiated from meristematic cells, procambium and vascular cambium. This is vascularisation in plants. Auxins and cytokinin are essential for this process.
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