anatomical characters of epidermis of dicot root
Answers
Epidermis: The epidermis consists of closely packed elongated cells with thin walls that usually lack a cuticle and stomata. In some dicotyledons thickened outer walls occur in root parts growing in air and also in roots that retain their epidermis for a long time
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Explanation:
The epidermis consists of closely packed elongated cells with thin walls that usually lack a cuticle and stomata. In some dicotyledons thickened outer walls occur in root parts growing in air and also in roots that retain their epidermis for a long time. The root epidermis (also known as piliferous layer, rhizodermis or epiblema) is typically uniseriate.
Most of the epidermal cells extend out in the form of tubular unicellular root hairs. Normally, the root hairs are confined to a region between one and several centimetres in length near the tip. They are absent in the nearest proximity of the apical meristem, and they die off in the older root parts.
Some roots also develop a specialized layer—the exodermis—beneath the epidermis. The exodermis arises from one or several of the sub-epidermal layers of the cortex. The cell walls of exodermis become suberized. The exodermis is found to be present in few dicots.