Question

Vascular cambium is a meristematic layer that cuts off :

• A. Primary xylem and primary phloem
• B. Xylem vessels and xylem tracheid
• C. Primary xylem and secondary xylem
• D. Secondary cells of xylem, phloem and medullary rays

Answer 1

Answer: (A)

1. The vascular cambium is meristematic layer that cuts off primary xylem and primary phloem towards the pith that mature into secondary xylem and secondary phloem.​
2. Inter and intrafascicular cambiums join to form a complete ring of cambium called as vascular cambium, which initiates intrastellar secondary growth.
3. The vascular cambial cells are the meristematic cells that continuously divide into daughter cells.
4. The daughter cells produced inward towards pith mature into secondary xylem elements, while those produced outward toward cortex differentiate into secondary phloem elements.