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Secondary xylem and phloem in dicot stem are produced by:

1. Apical meristems
2. Vascular cambium
3. Axillary meristems
4. Phellogen

Correct answer: Vascular cambium

Solution

Vascular cambium is the lateral meristem that produces secondary xylem inward and secondary phloem outward in dicot stems. This is the source of secondary growth, increasing stem thickness.

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