Question

Phellogen and phellem respectively denote

• A. Cork and cork cambium
• B. Cork cambium and cork
• C. Secondary cortex and cork
• D. Cork and secondary cortex

Answer 1

The correct option is B Cork cambium and cork

In the dicot stem, a couple of thick cell layers, made of narrow, thin-walled and nearly rectangular cells is present and is called as Cork Cambium (phellogen).
It has an important role in the secondary growth:

• Phellogen gives rise to cells on both sides. The outer cells differentiate into cork or phellem while the inner cells differentiate into secondary cortex or phelloderm
• Phellogen, phellem, and phelloderm are collectively known as periderm