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根据我在植物教学实践中的体会,介绍几种简而易做、效果较好的实验作法,供同志们共同研究及参考。(一)玉米果实构造的观察把作实验用的玉米果实以清水浸透(能切开为宜),用胡须刀片切开两片,以略加稀释后的碘酒液一、二滴,滴在玉米的纵切面上,经一分钟后用清水冲洗净,放在解剖镜下,就可以清楚地看到各部分构造,和课本第21页第16图的模样。观察时,因胚乳含丰富的淀粉呈紫蓝色,子叶和胚不含淀粉而不呈颜色。小麦也可用此法清楚地观察各部分构造。 (二)茎构造的观察剪取数段长约0.5—1尺的
According to my experience in plant teaching practice, introduce several simple and easy to do, better effect of experimental practices for comrades to study and reference. (A) the observation of corn fruit structure The experimental corn fruit soaked with water (to cut open appropriate), with a beard blade cut two, with a slight dilution of the iodine liquor one or two drops of The longitudinal section of corn, after a minute rinse with water, placed in the dissecting microscope, you can clearly see the various parts of the structure, and textbooks on page 21, Figure 16, look like. Observation, because the endosperm is rich in starch purple blue, cotyledons and embryos without starch without color. This method can also be used to clearly observe the various parts of wheat structure. (B) the observation of stem structure Cut a few paragraphs about 0.5-1 feet