The histogen theory was proposed by

Hanstein

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Eamu

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Esman

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Schmidt

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Solution

The correct option is A Hanstein
Histogen theory was proposed by Hanstein. According to histogen theory, there are 3 zones as dermatogen, periblem, and pleurome in shoot and root apical meristem. These three zones are considered as histogens or tissue builders. Each zone performs distinct functions and possesses group of initial cells.
Therefore, the correct answer is option A.

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