证明绿色植物光合作用需要CO_2的实验,其基本原理都是最后验证叶片中有无淀粉产生。这一类方法所需的时间都很长,学生在课堂内不可能观察到全过程。为了使学生获得感性认识和正确理解CO_2是光合作用的必需原料、光反应和暗反应的相互关系,我们根据天然水中一般含有CO_2,它又是水生植物进行光合作用所需原料的道理,参考有关资料,设计了本实验。 Evidence of photosynthesis of green plants need CO_2 experiments, the basic principle is to verify the final leaf starch production. The time required for this type of approach is long and it is impossible for students to observe the whole process in the classroom. In order to enable students to obtain perceptual knowledge and correct understanding of CO_2 is an essential raw material for photosynthesis, photoreaction and dark reaction, we based on the natural water containing CO_2, it is the photosynthesis of aquatic plants for raw materials truth, refer to Data, designed this experiment.