Question

who proposed Histogen theory?

Answer 1

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Hanstein

Histogen Theory: ADVERTISEMENTS: Hanstein in 1868 put forward histogen theory (histogen means tissue builder). According to this theory the tissues of a plant body originate from a mass of meristem where the following three (histogens) can be distinguished 

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Answer 2

$\huge\mathfrak\red{Elo!}$
Hanstein