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我敢说,极少人能发现教材中的差错,我却做到了,而且,我还用实验证实了自己的发现。 那是在上第九册自然《茎的作用》一课时,我们参照书上风仙花吸墨水变红的彩图,分组做小白菜吸收运输红墨水的实验,结果没有一组是做成功的。老师解释说,可能是时间不够长,继续做下去就会成功。同学们对此深信不疑,但我当时就提出质疑:如果根在红墨水里就吸红,那么在黑墨水里便会吸黑,怎么不见长期长在墨黑的污水沟里的植物生得黑枝黑叶呢? 为了弄个究竟,我决定重做实验。我找来三个口径约6厘米的玻璃茶杯,
I dare say that very few people can find mistakes in teaching materials, but I did, but I also experimentally confirmed their findings. That is a natural class in the ninth book, “the role of stem” a lesson, we refer to book ink color red ink Yinsen flowers, cabbage cabbage absorption of red ink transport experiments, the results did not make a success. The teacher explained that it may be time is not long enough to continue doing so will be successful. The students believed in this, but I questioned at the time: if the root is red in the red ink, it will black in the black ink, why not see a long black ink in the sewage ditch plants have black branches Black leaf it? In order to find out, I decided to redo the experiment. I got three glass cups about 6 cm in diameter,