The histogens are classified on the basis of:

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(B) The histogen theory,proposed by Hanstein,suggests that the root and shoot apices consist of distinct layers of meristematic cells called histogens

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Cells they give rise to future tissue

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(B) The histogen theory,proposed by Hanstein,suggests that the root and shoot apices consist of distinct layers of meristematic cells called histogens. These histogens are classified based on the specific types of future tissues they give rise to. The three histogens are: $1$. Dermatogen: Gives rise to the epidermis. $2$. Periblem: Gives rise to the cortex. $3$. Plerome: Gives rise to the stele (vascular cylinder).

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