In Botany, What Is Phellogen?

The cork cambium, also known as phellogen, is a type of meristematic tissue found in woody plants’ outer covering of the stem or trunk. It is one of three parts of the thicker protective layer of the bark, called the periderm. Phellogen, a secondary meristematic tissue of spermatophytes, is part of the bark and produces cork. It is relatively simple in structure and arises in the epidermis, hypodermis, cortex, and phloem tissue.

The cork cambium is a layer of meristematic tissue that forms the phelloderm inwards (toward the vasculature) and the suberized phellem outwards (toward the periderm). Secondary tissues are formed by two types of lateral meristems: vascular cambium and cork cambium or phellogen. Vascular cambium produces secondary vascular tissues, while the first phellogen differentiates in the seedling stage from collenchyma cells in the second or third layer beneath the epidermis. The subsequent phellogen is periodically derived.

Phellogen is defined as the meristematic cell layer responsible for the development of the periderm. Cells that grow inward from there are termed phelloderm. The cork cambium is a type of meristematic tissue present in many vascular plants and usually develops in the cortex region as the stem grows. During periderm maturation, both radial and tangential phellogen cell walls thicken as they strengthen and become resistant to fracture, providing the phellem.

What is phellogen in plants?

The phellogen layer, also designated as the cork cambium, represents a proliferative zone of cells that differentiate into phellem on the exterior and phelloderm on the interior, thereby constituting the outer bark. As the tree continues to grow, new phellogens may form at deeper levels within the phloem, which may result in the outward displacement of the older phellogens.

Is phellogen primary or secondary?

The correct answer is D, which identifies the secondary meristem phellogen or cork cambium as the entity responsible for secondary growth.

What is cambium in botany?

The cambium is a layer of cells that divides between xylem and phloem tissues in plants, responsible for secondary growth of stems and roots. It is a layer of cells called initial cells, but it is difficult to distinguish from their undifferentiated daughter cells. The cambium may also form within callus tissues, which are masses of cells that grow over the injured surface of a wound, leading to healing. Secondary growth occurs after the first season and results in an increase in thickness.

What is the function of cork cambium?

The cork cambium, a component of the plant’s bark, is responsible for the production of cork cells, which serve as a protective barrier against pathogens and prevent water loss. The number of these cells increases in proportion to the circumference of the plant, thereby ensuring its continued health and longevity.

Is phellogen living or dead?

The periderm of plants can be divided into three distinct types: the phelloderm, which is a layer located inside the cork cambium; the cork cambium itself, which is a meristem; and the phellem, which is a dead layer. The phelloderm is located on the internal surface of the plant, while the phellem is situated on the external surface. Both the phelloderm and phellem are produced by the phellogen tissue and are located within the cork cambium of plants.

Is phellogen a primary meristem?

The correct answer is D, which identifies the secondary meristem phellogen or cork cambium as the entity responsible for secondary growth.

What is the difference between phelloderm and phellogen?

Phellogen, a meristematic tissue, has its origin in cortical cells, which may also be pericycle cells. These actively divide to form the phellem on the outer side and the phelloderm on the inner side, thus originating from phellogen.

What is the function of the phellogen and the phelloderm?

Phellogen, also known as cork cambium, is a meristematic plant tissue responsible for the formation of the periderm covering stem shoots and roots. Its inner side forms the phelloderm, while its outer side forms the cork suber. Phellogen is used in various exams such as IIT JEE, NEET, UP Board, Bihar Board, and CBSE. Free textbook solutions for various subjects are available, including KC Sinha Solutions for Maths, Cengage Solutions for Maths, DC Pandey Solutions for Physics, HC Verma Solutions for Physics, Sunil Batra Solutions for Physics, Pradeep Solutions for Physics, Narendra Awasthi Solutions for Chemistry, MS Chouhan Solutions for Chemistry, and Errorless Solutions for Biology. Free NCERT Solutions are available for various English Medium classes.

What are the three types of cambium?

Cambium tissue can be classified into three categories: cork, unifacial, and vascular. The presence of each type is contingent upon the species of plant in question; cork cambium is the primary tissue responsible for plant growth.

What is the difference between cambium and phellogen?

Phellogen is a type of meristematic tissue produced in woody plants, forming a ring-like structure around the inner tissues. It undergoes division on the inner side, forming the inner secondary cortex, and on the outer side, forming hardened corky tissue. The common bottle cork is produced from the phellogen of the Quercus suber (cork oak tree), which is also known as cork cambium.

What is another name for phellogen?

Phenogen, also referred to as Periderm, is a fungal species that has been linked to a range of health concerns.