在教学实践中,用实物演示玉米种子的结构时,如果按教材上的做法去做,效果很不理想,而改用煮成半熟的玉米粒,纵切开来,再在切面上涂抹稀碘酒溶液,进行观察,效果十分明显。所以我建议作如下的修改: 取浸软了的玉米粒,放入烧杯中煮成半 In teaching practice, using physical objects to demonstrate the structure of corn seeds, the effect is very unsatisfactory if it is done according to the teaching materials. Instead, use cooked boiled corn kernels, cut them longitudinally, and apply diluted iodine to the cut surface. Wine solution, observe, the effect is very obvious. So I suggest to make the following changes: Take the soaked corn kernels and put them into a beaker to cook them in half