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我在植物学教学上也曾多次应用南瓜的茎,来作切片观察导管,手续总觉得还是麻烦,尤其让初中一年级的学生作徒手切片,更加困难,所以我就改用西瓜胎座部的输导束作为观察材料,手续十分简单但效果非常良好:
I have repeatedly applied the stem of pumpkin in botany teaching to observe the catheter in slices. The procedure always felt troublesome. In particular, it was more difficult for the freshman of the first grade of junior high school to make hand-sliced slices, so I switched to the watermelon placenta Of the guide beam as the observation material, the procedure is very simple but the effect is very good: