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Question : Histogen theory of Stem. Explain.

Answer»

Solution :Histogen theory is prooposed by Hanstein (1868) and supported by Strassburgur. The shoot apex comprises three distinct ZONES.
1. Dermatogen : It is a outermost LAYER. It gives rise to epidermis.
2. PERIBLEM : It is a middle layer. It gives rise to cortex.
3. Plerome : It is INNERMOST layer. It gives rise to stele.


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