Dermatogen,periblem and plerome are

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(B) According to the histogen theory proposed by Hanstein $(1870)$,the shoot apex is differentiated into three distinct meristematic zones or layers:$

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Meristematic tissues

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(B) According to the histogen theory proposed by Hanstein $(1870)$,the shoot apex is differentiated into three distinct meristematic zones or layers:$(a)$ Dermatogen: It is the outermost layer that forms the epidermis.$(b)$ Periblem: It is the middle layer that gives rise to the cortex and endodermis.$(c)$ Plerome: It is the central core that forms the pericycle,vascular bundles,medullary rays,and pith.Since these layers are responsible for the formation of various plant tissues through continuous cell division,they are classified as meristematic tissues.

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