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高中《生物》课本中,绿色植物的“水分代谢”提到“渗透吸水原理”和“细胞吸水力”。这一节教材是教学上的难点。其中关于“渗透压”的讲解更是难点中的难点。 (一)什么是渗透作用在一杯清水中,滴入几滴蔗糖液,蔗糖液会渐渐扩散,直到全杯水中蔗糖分子均匀分布为止,这称为扩散作用。渗透作用是扩散作用的特殊形式,是溶剂分子(如水分子)通过半透膜的扩散作用。
In high school “biology” textbooks, the “water metabolism” of green plants refers to “osmotic water absorption principle” and “cell water absorption.” This section of teaching materials is a teaching difficulty. One of the “osmotic pressure” to explain more difficult difficulties. (A) What is the role of infiltration in a glass of water, dropping a few drops of sucrose solution, sucrose solution will gradually spread until the entire cup of water until the sucrose molecules evenly distributed, which is called diffusion. Infiltration is a special form of diffusion that is the diffusion of solvent molecules (such as water molecules) through the semi-permeable membrane.