Question

Cork tissue arises from
A. Periderm
B. Phellogen
C. Phelloderm
D. Phellem

Answer 1

Hint: During extra stelar secondary growth, the epidermis and pericycle along with parenchyma or collenchyma cells acquire the secondary meristematic property. This happens through the process of dedifferentiation and it is converted to phellogen or cork cambium.

Complete answer:
> Option (A) - Periderm
They are a group of secondary tissues that forms a protective layer and replaces the epidermis of many plant stems, roots, and other parts. They are composed of cork cambium, phelloderm, and cork.

> Option (B) - Phellogen
It is called the cork cambium. It produces the inner tissues in dicotyledonous stems and develops from hypodermal cells which are collenchymatous or sometimes from epidermal cells near to the cortex. Phellogen produces secondary tissues more on the outer side than the inner side.

> Option (C) - Phelloderm
It is A part of the periderm made up of cells produced inwardly by the cork cambium. It Supplements in woody plants. This epidermis is eventually replaced by a tougher and protective layer called bark.

> Option (D) - Phellem
Cork is an impermeable buoyant material. It is the phellem layer of bark tissue that is planted for commercial use primarily from Quercus suber. Cork is composed of a hydrophobic substance called suberin.

Hence, The correct answer is option (B).

Note: A water-resistant bark that arises due to the activity of the 'cork cambium' or the 'phellogen' is known as the cork tissue. It is a lateral tissue. It helps in the formation of the 'secondary tissue' that replaces the shoot and the root. It is primarily made by the 'parenchyma cells.