What is periderm?

A. Special epidermal cells that regulate gas exchange
B. Outer layer of the vascular cylinder in a plant root
C. Layers of cells just inside root endodermis
D. Dermal tissue that replaces epidermis on the surfaces of older stems and roots
E. Tissue that consists of densely packed dead cells with thickened, waxy walls


Answer: D

Biology & Microbiology

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