In plant anatomy, what three tissues collectively constitute the periderm?

Answer and explanation

Correct answer: D. Phellogen, Phellem, and Phelloderm

  1. Step 1: In stems and roots undergoing secondary growth, increased internal girth causes the outer cortical and epidermal layers to rupture.
  2. Step 2: A secondary lateral meristem called phellogen (cork cambium) differentiates in the cortex.
  3. Step 3: Phellogen cuts off suberized phellem (cork) toward the outside and parenchymatous phelloderm (secondary cortex) toward the inside.
  4. Step 4: Together, phellogen, phellem, and phelloderm are designated as periderm.
Answer
Phellogen (cork cambium), Phellem (cork), and Phelloderm (secondary cortex)
Why not the others: 'Epidermis, Endodermis, and Pericycle' are primary tissues of the primary stem and root; 'Primary xylem, Secondary xylem, and Medullary rays' are vascular tissues; 'Protoderm, Procambium, and Ground meristem' are the three primary meristematic tissues of the apical meristem.

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