Question

Secondary growth fails to occur in monocot stem primarily because:

• A. Vascular bundles are open
• B. No cambium layer between xylem and phloem
• C. Excess parenchyma
• D. More sclerenchyma than dicots

Answer 1

Answer:

B. No cambium layer between xylem and phloem

• Monocot stems lack the vascular cambium (lateral meristem) present between primary xylem and phloem in dicots, preventing secondary growth that produces annual rings and girth increase.