The Histogen theory is more applicable for:

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(A) The Histogen theory,proposed by Hanstein,suggests that the plant body is derived from three distinct layers of meristematic cells called histogens

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Root apex

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(A) The Histogen theory,proposed by Hanstein,suggests that the plant body is derived from three distinct layers of meristematic cells called histogens: dermatogen,periblem,and plerome.This theory is considered more applicable and accurate for the root apex,where these three distinct zones can be clearly identified and traced to their respective mature tissues.In the shoot apex,the organization is more complex and does not strictly follow the three-layered histogen pattern as clearly as it does in the root.

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