Plerome gives rise to:

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(D) According to the Histogen theory proposed by Hanstein,the root apex is composed of three distinct meristematic zones:$1$. Dermatogen: The outermos

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Vascular tissue system and pith

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(D) According to the Histogen theory proposed by Hanstein,the root apex is composed of three distinct meristematic zones:$1$. Dermatogen: The outermost layer that gives rise to the epidermis or epiblema.$2$. Periblem: The middle layer that gives rise to the cortex.$3$. Plerome: The innermost central core that gives rise to the vascular tissue system (xylem and phloem) and the pith.Therefore,the correct option is $(d)$.

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