Question

The vascular cambial ring of dicot stem is

• A. Primary in origin
• B. Secondary in origin
• C. Partly primary partly secondary in origin
• D. Embryonic in origin

Answer 1

The correct option is D Embryonic in origin

Inter-fascicular cambiums develop very early during the first year. And even before the beginning of secondary growth. The activity of the cambium will increase their diameter as well as the vascular bundles elongated in cross-section. More xylem than phloem elements is produced. Annual rings become clearly visible when vessels with a wide lumen are assembled first (earlywood) than vessels with a narrow lumen (latewood).

Thus, the correct option is C.