Question

Cork of dicot stem comprises of

• A. Phelloderm
• B. Phellem
• C. Phellogen
• D. Phloem

Answer 1

The correct option is B Phellem

Cork cambium is a tissue found in many vascular plants as part of the periderm. The cork cambium is a lateral meristem and is responsible for secondary growth that replaces the epidermis in roots and stems.

Synonyms for cork cambium are phellogen.

Phellogen is defined as the meristematic cell layer responsible for the development of the periderm.

The periderm thus consists of three different layers:

1. phelloderm – inside of cork cambium; composed of living parenchyma cells

2. phellogen (cork cambium) – meristem that gives rise to periderm

3. phellem (cork) – dead at maturity; air-filled protective tissue on the outside.