Question

According to Haberlandt, which of the following region give rise to epidermal tissue system?
A. Protoderm
B. Tunica
C. Procambium
D. Periblem

Answer 1

Epidermal tissues are part of the epidermis layer which covers the leaves, roots, flowers, and stems of the plants. These tissues help in the formation of the boundary between the external environment and the plant. These tissues are very important for the plants.

Step by step answer: Epidermal tissue are very important as it helps in many functions in the body of the plants which are protected against water loss, secrete metabolic compounds, regulates gas exchange, and absorbs mineral nutrients and water. Woody stems and other stem structures like potato tubers produce a secondary covering known as periderm which replaces the epidermis and functions as a protective covering. The epidermis is the outermost layer of the primary plant body and presents on the apical portion of the plant. Epidermal cells have been regarded as specialized parenchyma cells and classify epidermis as dermal tissue whereas parenchyma is classified as ground tissue.
Protoderm which is classified as a type of meristem by Haberlandt in 1890 is present in the apex of the stem. There were three classifications of the apical meristem provided by Haberlandt. These were protoderm, procambium, and ground meristem. Protoderm is an outermost layer of apical meristem which develops into the epidermis or epidermal tissue system.
Hence, the correct option is A. Protoderm.

Note: Epidermis consists of three major cell types which are guard cells, pavement cells, and their subsidiary cells which surround the stomata and trichomes which are known as leaf hairs. Epidermis cells are structurally and functionally variable and perform different tasks in different plant species.