Synopsis Water absorption by plants and its subsequent translocation to leaves are passive processes, which do not consume any metabolic energy generated by plants. The absorbed water is evaporated by plants mainly through stomata. This loss of water from the aerial parts of the plant is termed as transpiration and occurs almost entirely through the leaves. The loss of water from a leaf surface takes place mainly through the stomata. The book presents an over all description of eco-physiological aspects of water loss by plants.