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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 vascular cambium
  3. just inside vascular cambium
  4. just inside cork cambium


Solution

The correct option is C just inside vascular cambium
The formation of secondary xylem, phloem, secondary cortex, and cork is called secondary growth. In secondary growth, vascular cambium forms secondary xylem towards the inner side and secondary phloem towards the outer side. Cork cambium forms cork towards outside and secondary cortex towards inside. So, the youngest secondary xylem would be just inside of vascular cambium.

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