Question

Mention the derivate of epidermis with its function. What changes takes place in epidermis as the plant grows older? Give functions of stomata.

Answer 1

Answer:

1. pith

2. protollll

3. xylem

4. phloem

5. sclerenchyma (bast fibre)

6. cortex

7. epidermis

The epidermis (from the Greek meaning "over-skin") is a single layer of cells that covers the leaves, flowers, roots and stems of plants. It forms a boundary between the plant and the external environment. The epidermis serves several functions: it protects against water loss, regulates gas exchange, secretes metabolic compounds, and (especially in roots) absorbs water and mineral nutrients. The epidermis of most leaves shows dorsoventral anatomy: the upper (adaxial) and lower surfaces have somewhat different construction and may serve different functions. Woody stems and some other stem structures such as potato tubers produce a secondary covering called the periderm that replaces the epidermis as the protective covering.