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Question

The youngest layer of secondary xylem in the wood of dicot plant is located: 
  1. Between pith and primary xylem
  2. Just outside of vascular combium
  3. Just inside of vascular combium
  4. Just inside of cork combium


Solution

The correct option is C Just inside of vascular combium
The formation of the vascular cambium is initiated when cells between the columns of vascular tissue connect the cambia inside the columns of vascular tissue to form a complete cylinder around the stem. The cells formed towards the inside are called as secondary xylem or wood and those formed towards the outside of the cambium are known as secondary phloem. So, youngest layer of secondary xylem is located just inside vascular cambium. 

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