Multiple choice The youngest layer of secondary xylem in the wood of dicot plant is located between pith and primary xylem just out side vascular cambium just inside vascular cambium just inside cork cambium Reveal answer Fill a bubble to check yourself C Correct answer Explanation The vascular cambium produces secondary xylem towards the inside. Therefore, the youngest (most recently formed) layer of secondary xylem is located immediately inside the vascular cambium.