【教学目标】科学概念:水葫芦叶柄部位膨大的海绵体充满空气是浮在水面上的原因。水生植物都有根茎叶等器官,它们的生长需要水分、阳光和空气。过程与方法:用简图画出水生植物的主要形态特征,能看懂维恩图的表达方式。在观察中提出问题,探究水葫芦浮在水面的秘密。情感、态度、价值观:培养研究水生植物的兴趣,体会到水生植物也是一个个活生生的生命个体。【教学重点】利用维恩图总结水生植物的相同点和不同点。 【Teaching Objectives】 Scientific concept: Water hyacinth petiole swollen parts of the sponge is full of air floating on the surface of the reason. Aquatic plants have roots and leaves and other organs, their growth needs water, sunlight and air. Process and method: Sketch the main morphological characteristics of aquatic plants, and understand the expression of Venn diagram. In the observation of the issue, to explore the secret of water hyacinth floating. Emotions, Attitudes, Values: Cultivating interest in studying aquatic plants and realizing that aquatic plants are also living creatures. Teaching Focus Use Venn diagram to summarize the same and different points of aquatic plants.