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Tissue and Tissue System — BIO BOTANY STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11BIO BOTANYTissue and Tissue System3 Marks
Question
Explain histogen theory.
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Answer

Histogen theory is proposed 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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