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What happens during vascularization in plants?

1. Differentiation of procambium is immediately followed by the development of secondary xylem and phloem
2. Differentiation of procambium followed by the development of xylem and phloem
3. Differentiation of procambium, xylem and phloem is simultaneous
4. Differentiation of procambium followed by the development of primary phloem and then by primary xylem

Correct answer: Differentiation of procambium followed by the development of primary phloem and then by primary xylem

Solution

During vascularization, procambial cells differentiate first, and the primary vascular tissues form in sequence. Primary phloem develops before primary xylem, so the correct choice is the one that preserves that order.

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