Question

How does the epidermal layer of a young stem turn into the bark of a matured trunk?

Answer 1

when the epidermal which comes under meristmatic tissue grows old it stops dividing and then grow up to matured permanent tissue

Answer 2

Following is a detailed explanation of how the epidermal layer of a young stem turns into the bark of a matured trunk:

• Young stems of plants or trees have five layers of tissues instead of a tough bark. The tissue layers are the outermost layer of the epidermis, the next layer of the cortex, primary and secondary phloem layers, the thick vascular cambium, and the innermost layer of primary and secondary xylem tissues.
• With the maturation of the stem, the epidermal layer covers the structures of a plant like its stems, leaves, and fruits and protects them from getting damaged by the environment.
• In old trees, the epidermal layer along with the cortex and primary phloem tissues separated from the inner mass of tissues and form a thick 'cork'-like layer.
• Eventually, these cells die and the cork layer becomes highly thick.
• This dead epidermal layer forms the bark of the matured tree trunk.

Hence, the epidermal layer in a young stem turns into the corky hard bark of a matured trunk.

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