What happens in plants during vascularisation?
- Formation of procambium, primary phloem and xylem simultaneously
- Differentiation of procambium followed by the formation of secondary xylem
- Differentiation of procambium, formation of primary phloem followed by formation of primary xylem
- Differentiation of procambium followed by the formation of primary phloem and xylem simultaneously
Answer
(4) Differentiation of procambium followed by the formation of primary phloem and xylem simultaneously
Solution
Vascularisation is the development of vascular tissues from the procambium in the growing regions.
⇒ First the procambium differentiates from the apical meristem.
⇒ The procambial strands then give rise to primary phloem and primary xylem, which develop together as vascular bundles.
∴ Secondary xylem is formed later by the vascular cambium during secondary growth, not during vascularisation.
Answer: (4)