A) Differentiation of procambium followed by primary phloem and then primary xylem
B) Differentiation of procambium, xylem and phloem simultaneously
C) Differentaition 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 :
From the procambium, (primary) xylem and phloem arise simultaneously.
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