Vascular cambium is completely secondary in origin w.r.t?

Dicot stem

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Monocot stem

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Dicot root

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More than one is correct

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Solution

The correct option is D Dicot stem
Lenticels permit the exchange of gases between the outer atmosphere and the internal tissue of the stem. These occur in most woody trees. In the dicot root, the vascular cambium is completely secondary in origin. Further events are similar to those already described above for a dicotyledon stem.

So, the correct option is "A" (Dicot stem).

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