Transpiration is the loss of water in the form of water vapour from aerial parts of the plants.
Stomatal transpiration: through stomata.
Cuticular transpiration: truk article of leaves and green herbaceous stems.
Lenticular transpiration: true lenticels present on Woody stems.
Stomata:small pores present on the leaves which contains two kidney shaped guard cells the opening and closing of stomata depend on the change in turgor pressure of guard cells the rate of transpiration is more from the ventral surface of dorsiventral leaf the rate of transpiration is more from the ventral surface of dorsiventral leaf the rate of transpiration is affected by sunlight and humidity temperature and last leaf surface.
Experiments to show transpiration include the bell jar method weghing Cobalt chloride paper experiments and Polo metre experiment.
Xerophytes check excessive transpiration by having reduced leaf surface sunken stomata thick cuticle leaves reduced to spines.
Advantage of transpiration:it causes translation tool which helps in the absorption of water.
It produces a cooling effect.
Help in the ascent of SAP.
Disadvantage of transpiration: exercise lost of water cause wilting.
It causes premature fall of leaves.
Loss of water in the form of droplets though hydathodes.
Exudation of plant SAP from the injured part of the plant.
