Question

Dermatogen, periblem and plerome are

• A. Permanent tissues
• B. Meristematic tissues
• C. Intercalary tissues
• D. Secondary tissues

Answer 1

Answer: (B)

Meristematic tissues

According to Histogen theory by Hanstein, the three principal tissues of the root - vascular cylinder, cortex, and epidermis originate from three groups of meristematic cells or histogens :

1. Dermatogen (outermost layer) that gives rise to epidermis.
2. Periblem (middle layer) that gives rise to hypdermis, cortex and endodermis.
3. Plerome (innermost layer) that gives rise to vascular tissue including pith.

Thus, the correct answer is option B.