Question

In the diagram of lenticel, identify the parts as A, B, C, D

• A. A- phellem, B- complementary cells, C- phellogen, D- phelloderm
• B. A- phellem, B- complementary cells, C- phelloderm, D- periderm
• C. A- complementary cells, B- phellogen, C- phelloderm, D- periderm
• D. A- complementary cells, B- phellem, C- periderm, D- phelloderm

Answer 1

The correct option is A A- phellem, B- complementary cells, C- phellogen, D- phelloderm

The parenchyma or collenchyma cells acquire secondary meristematic property by de-differentiation and is called as phellogen or cork cambium. The outer cells gradually lose their protoplast and become dead. These cells constitute cork or phellem. These inner derivatives remain living and differentiate into parenchyma or collenchyma. This newly formed inner zone is called as secondary cortex or phelloderm. The phelloderm, phellogen and phellem are the primary covering layer when the epidermis gets ruptured. The complementary cells is a mass of cells in plants which is formed from the cork cambium at the position of the lenticels. This loosely arranged cells helps in gaseous exchange.
Thus, the correct answer is option A.