Question

Dermatogen produces
a. Epidermis
b. Hypodermis, cortex, and pith
c. Hypodermis, cortex, and endodermis
d. Pericycle, vascular strand, and pith

Answer 1

Hint: In the plants of both angiosperms and the gymnosperms, the root structures are mainly 3 types which are, vascular cylinders, cortex, and epidermis, and these structures are formed by the apical meristem of Plerome, periblem, and dermatogen, respectively.

Complete answer:
- According to the histogen theory, it states that epidermis is formed from the cells of the primary meristem, found in the apical cells of the root called dermatogen.
- The epidermis is the single layer of the cells, which usually form the outer layer of the roots, stems, leaves, and flowers, and all parts of the flower.
- The epidermis is the layer, which demarcates the plant from the external environment.
- It has many functions, which include the exchange of gases, that is produced in the plants outside, and vice versa.
- Whereas the epidermis of the leaves shows the dorsoventral structure, which on the top it forms the adaxial surface, while on the bottom it forms the abaxial surface and both surface structures are different.
- The epidermis is the main component of the dermal tissues of the plant.
- In the epidermis, the chloroplast is very less in number or absent except for the presence of guard cells.
- The several different types of epidermal cells which are found are epidermal cells, guard cells, subsidiary cells, and epidermal hair.
- In secondary growth, the epidermis is replaced by the periderm, in most of the plants.

Hence, the correct answer is option (A).

Note: The hairs in many species of the plants which have outgrown the epidermis are trichome, and they are present in many roots of the plants, which is useful for the water absorption and transport and nutrients absorption.