Question

Periderm is made up of

• A. Phellem
• B. Phellogen
• C. Phelloderm
• D. All of the above

Answer 1

The correct option is D All of the above

In extrastelar secondary growth, epidermis and pericycle with parenchyma acquire secondary meristematic property by de-differentiation and is called as cork cambium. It is a lateral meristem which helps in secondary growth. It produces tough protective material called as cork. The phelloderm is present inside the cork cambium. The phelloderm (secondary cortex), phellogen (cork cambium) and phellem (cork) are the covering layer when the epidermis gets ruptured. The newly formed periderm (phelloderm, phellogen and phellem) becomes the protective layer.

So, the correct answer is 'All of the above'