Types of Transpiration system of plants.

Life science PPT

1. Transpiration By : Richa Singh

2. Definition The physiological process by which the excess water is lost from the living tissues of the plant in form of vapor is called Transpiration. Transpiration is the process of water movement through a plant and its evaporation from aerial part, such as leaves, stems and flowers. Transpiration is a process by which water vapor leaves the living plants body and enters the atmosphere. (Michel,1978) This Photo by Unknown Author is licensed under CC BY

3. Characteristics According to the recent studies it has been revealed that about 10% of the moisture found in the atmosphere is released by plants through respiration. The remaining 90% is mainly supplied by evaporation form ocean, sea, lakes, rivers, streams etc. During dry periods, transpiration increase the loss of water in upper layer of soil, which effect vegetation, horticulture and agronomic field crops. Plant respiration is pretty much an invisible process. Transpiration is the evaporation of water from plants and trees. Approximately 90% of all water taken up by a plant is lost to transpiration.

4. Importance of Transpiration Transpiration creates negative pressure gradient that helps draw water and minerals up through the plant from its root. It helps to keep the plant cool on hot weather- a method of evaporation cooling. It supports Photosynthesis and encourages the exchange of gases, helping maintain levels of CO 2 and O 2 in the atmosphere.

5. Types of Transpiration On the basis of passages through which plants give out water in the form of vapor transpiration is of three types: Stomatal Cuticular Lenticular Transpiration Transpiration Transpiration

6. Stomatal Transpiration Transpiration that occurs through stomata called stomatal Transpiration. This type of transpiration only occurs in presence of sunlight, because stomata opens in the presence of sunlight and close in darkness. In this method plant gives out 80-90% water in the form of vapor.

7. Cuticular Transpiration Transpiration the occurs through the cuticle or cracks of thin cuticle layers of leaves and stem is said to be Cuticle Transpiration. This is a day-night process. In this process, 5-10% water is given out in the form of vapor. This Photo by Unknown Author is licensed under CC BY-SA-NC

8. Lenticular Transpiration Sometimes transpiration occurs through lenticles, the small openings in the corky tissue covering stems and twigs, and this type of transpiration is called Lenticular Transpiration. In this process only 0.1% of water is given off in the form of vapor. This Photo by Unknown Author is licensed under CC BY

9. Conclusion Too much wind is not good for transpiration. Stomata closes and cause little to no transpiration. Stomata Close/wind strong=sensor reads positive pressure . For the plant cuttings placed 40cm from the wind source, the plants transpired slowly or not at all. The rate of transpiration, in this case, was actually positive 0.02mmHg/10sec. Plants experiencing this much wind would thus starve.

10. Reference : Google THE END