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为了说明光合作用对自然界和人类的意义,作者在教学过程中,曾组织生物课外研究小组的学生,做了一个证明动植物之间密切关系的实验。在上课前15—30天,取两个同样大小的广口瓶(容积最好是500毫升以上的),洗刷干净以后装满清水,再把两条带顶端的长5—6厘米的新鲜金鱼藻,用白线系到一块干净的小石子上,放入其中一个广口瓶里,使金鱼藻沉入水底,另一个广口瓶不放金鱼藻做为对照。然后选择四条生活力差不多,长约3—4厘米健康的小麦穗鱼,每个广口瓶中放入两条,塞紧瓶口
In order to illustrate the significance of photosynthesis for nature and humanity, the author has organized students in the extra-curricular research group to conduct an experiment to prove the close relationship between animals and plants. In the 15-30 days before class, take two jars of the same size (preferably 500 ml or more in volume), wash them and fill them with clear water, and then put two fresh goldfish with a tip length of 5-6 cm. The algae was tied to a clean pebble by a white thread and placed in one of the wide-mouthed jars to sink the goldfish into the bottom of the water. The other jar was kept as a control. Then choose four healthy wheat ear fish with a life span of about 3-4 cm. Put two in each jar and stopper the bottle.