Class 11 Biology Anatomy of Flowering Plants Epidermal tissue system

Epidermal tissue system

  • The epidermis is the outermost layer of the primary plant body, made up of elongated, compactly arranged cells, which form a continuous layer.
  • The outside of the epidermis is often covered with a waxy thick layer called the cuticle which prevents the loss of water.
  • Stomata are structures present in the epidermis of leaves, which regulate the process of transpiration and gaseous exchange.
  • Each stoma is composed of two bean- shaped cells known as guard cells, which regulate the opening and closing of stomata.
  • Some epidermal cells in the vicinity of the guard cells become specialised in their shape and size and are known as subsidiary cells.
  • The stomatal aperture, guard cells and the surrounding subsidiary cells are together called stomatal apparatus.
  • The root hairs are unicellular elongations of the epidermal cells and help absorb water and minerals from the soil.
  • On the stem the epidermal hairs are called trichomes, which are multicellular in the shoot system.


Fig. Epidermal cells

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