Tiêu đề 11 Transport in plants ppt - part 2.pdf ✅

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• Water is a universal solvent. • Protoplasm is mainly water in which various molecules are dissolved and suspended. • Soft plant parts mostly contain water. E.g. watermelon has 92% water. • Herbaceous plants have only 10 - 15% dry matter. • Dry seeds and woody parts also contain little water. • A mature corn plant absorbs 3 litres of water daily. • A mustard plant absorbs water equal to its own weight in about 5 hours. bankofbiology.com
• It is the potential energy of water. • It is the measure of the ability of water molecules to move freely in solution. • It is expressed in pressure units such as Pascals (Pa). • Water molecules have kinetic energy. In liquid & gaseous form, they show random, rapid and constant motion. • As the concentration of water in a system increases, its kinetic energy (‘water potential’) also increases. Hence, pure water will have greatest water potential. bankofbiology.com Water Potential (Ψw)