1. Stomatal transpiration: When the excess water absorbed by the roots of the plant evaporates through the stomata, it is called stomatal transpiration. Leaves are the main sensory organ. However, the sepals and petals of flowers have leaf pores. 95-98% of the total respiration in plants is stomatal respiration.
2. Cuticular transpiration: When the excess water absorbed by the root of the plant evaporates through cutin or cuticle, it is called cuticular transpiration. Cutin or cuticle is a covering of the outer skin to protect the plant body from desiccation. Water evaporates through the cuticle. 5-10% of total plant respiration is cuticular respiration.
3. Lenticular transpiration: When the excess water absorbed by the roots of the plant evaporates through the lenticels, it is called lenticular transpiration. During the secondary growth of the plant, lenticels form in place of the cork tissue. Water evaporates through the lenticels. Lenticular respiration accounts for 1% of total plant respiration. Such sensations occur at all times of the day and night.
