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高中生物（必修）“水分代谢”这一节,是第二章“生物新陈代谢”中的第一节。学生在学完了第一章“细胞”后,进入难度加大的第二章学习。因此,学好这第一节,对学生增强信心,学好后面的生物学知识其重要意义。 在讲授这一节时应注意下列一些问题: 一、讲清水分代谢、植物吸水与细胞吸水的层次关系及其不同特征 水分代谢是指绿色植物在生命活动中对水分的吸收、运输、散失的全过程。植物吸水是绿色植物水分代谢过程中的第一个环节,牵涉到植物吸水的主要器官（根）及其最活跃的部位（根毛区的表皮细胞）等,而实现植物吸水,首先要靠细胞吸水。与细胞吸水有关的是吸水的方式及其原理。不同的细胞,吸水的方式不同。不具大的液泡的细胞（干种子细胞,根尖
The section on “Water Metabolism” in High School Biology (required) is the first section of the second chapter “Biomass Metabolism.” After completing the first chapter “Cells”, students entered the second chapter of the more difficult learning. Therefore, it is important to learn this first section, to strengthen students’ confidence and to learn about the biological knowledge behind them. When teaching this section, you should pay attention to the following questions: First, explain the water metabolism, plant water absorption and cellular water absorption and its different characteristics. Water metabolism refers to the absorption, transportation, and loss of water in the life of green plants. The whole process. Water absorption of plants is the first link in the process of water metabolism of green plants. It involves the main organs (roots) of plants that absorb water and their most active parts (the epidermal cells of the root hairs area). To achieve water absorption in plants, the first step is to rely on the water absorption of cells. . Related to the water absorption of cells is the way of water absorption and its principle. Different cells, different ways of absorbing water. Cells without large vacuoles (dry seed cells, apical