What happens during vascularisation in plants?
Differentiation of procambium is immediately followed by the development of secondary xylem and phloem
Differentiation of procambium followed by the development of xylem and phloem
Differentiation of procambium; xylem and phloem is simultaneous
Differentiation of procambium followed by the development of primary phloem and then by primary xylem
From the procambium, primary xylem and phloem arise simultaneously. Hence, the correct answer is option 3.