Question

In a dicot root, vascular cambium originates from-

• A. Parenchymatous conjuctive tissue located just below phloem bundles
• B. Medullary rays
• C. A portion of pericycle tissue, lying opposite to protoxylem
• D. Both A and C

Answer 1

The correct option is D Both A and C

In dicot root, vascular cambium is completely secondary in origin and it originates from a portion of pericycle tissue.
The parenchyma cells present between xylem and phloem in the vascular bundles constitute the conjuctive tissue. Similary cells pf pericycle present against the protoxylem divide and form multiple layers of cells, which are joined by cambial cells derived from conjuctive tissues and together they make a complete cambium ring.
So, the correct answer is option 'd'.