Question

Phellogen is also known as
A. Vascular cambium
B. Periderm
C. Cork cambium
D. Apical meristem

Answer 1

Phellogen refers to a ring of meristematic tissue formed in the cortex of dicotyledonous stem during secondary growth. It is also known as cork cambium. It generates cork towards the periphery and secondary cortex towards the inner side.

Complete answer:
Option A- Vascular cambium
The vascular cambium is the main meristem in the stem. It produces undifferentiated wood cells inwards and barks cells outwards. The thickness of the vascular cambium varies. It could be around six cells during dormant periods and could become 14 during the most active periods of growth.

Option B- Periderm
It refers to a group of secondary tissues that form a protective layer and replace the epidermis of many plant stems, roots, and other parts. It is composed of cork cambium, phelloderm, and cork

Option C- Cork cambium
Cork cambium is a tissue that is seen in many vascular plants as a part of the epidermis. It is one of the many layers of bark that lies between the cork and primary phloem. It is a lateral meristem which is responsible for secondary growth that replaces the epidermis in roots and stems

Option D- Apical meristem
The apical meristem is the growth region in plants. It is located within the root tips and the tips of the new shoots and leaves. It is one of three types of meristem, or tissue that differentiates into different cell types.

So, the correct answer is option C- 'Cork cambium'.

Note: The main function of cork cambium is to produce the cork. It is a tough protective material. Cork cambium is also known as bark cambium, pericambium, and phellogen. Phellogen or cork cambium is defined as the meristematic cell layer responsible for the development of the periderm.