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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