Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Water is necessary for plants, but only a small amount of water taken up by the roots is used for growth and metabolism. The remaining 97 - 99.5% is lost by transpiration and guttation. The process of transpiration occurs when water moves through plants from the roots to the leaves, then changes to vapour as it leaves the plant. Transpiration cools the plant and also provides it with nutrients, carbon dioxide and water. There are three types of transpiration:
1. Stomatal transpiration
2. Cuticular Transpiration
3. Lenticular Transpiration.
It is transpiration. It has two main functions: cooling the plant and pumping water and minerals to the leaves for photosynthesis. Plants need to cool themselves for several reasons. The stomata (pores) must open to take in carbon dioxide for photosynthesis (especially crucial on mornings of sunny days).