Transport in Plants


  • Loss of water as water vapour from the living tissues of aerial parts of a plant is called as transpiration.
  • It is of different types - (i) Stomatal (ii) Cuticular, (iii) Lenticular and (iv) Bark.
  • Major part of transpiration occuss via stomatal apparatus.
  • Stomatal pores are tiny and are located in the epidermis of leaves, in young stem and in certain fruits (eg. Citrus, cucumber)
  • The pore is surrounded by kidney-shaped / bear shaped guard cells in dicot.
  • dump – bell-shaped guard cells are observed in monocotyledonous plants.
  • The outer wall of guard cells is thick and the inner wall is elastic and thick.
  • The guard cells contain radial, cellulose microfibrils, which support the free opening and closing of stomata.
  • Guard cell possesses chloroplast which is surrounded by accessory cells (or) subsidiary cells, does not possess chloroplast.

View this video for the topic  Transpiration part-1 from 28:01 to 29:52

iew this video for the topic  Transpiration part-2 from 34:14 to 46:50

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