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Question

According to histogen theory, during apical organization three histogens are formed. The part differentiated by plerome is

A
Cortex
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B
Xylem and phloem
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C
Ground tissue system
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D
Stele
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Solution

The correct option is D Stele
The histogen theory says that a growing point (as of a stem or root) consists of three histogens, each of which gives rise to a different tissue - dermatogen, periblem, plerome.
The dermatogens makes uniseriate epidermis by anticlinal divisions, periblem forms cortex and plerome serve as progenitor of stele (pericycle, vascular bundles, pith rays or medullary rays and pith).

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