Question

Secondary xylem and phloem in dicot stem are produced by

• A. Axillary meristems
• B. Apical meristems
• C. Phellogen
• D. Vascular cambium

Answer 1

Answer: (D)

• Vascular cambium is partially secondary
• Form secondary xylem towards its inside and secondary phloem towards outsides.
• $4-10$ times more secondary xylem is produced than secondary phloem.