在植物课上,講到水綿时,因为它的构造和一般細胞的构造不大一样(細胞是元筒状的,細胞質分成两部分,还有細胞质丝,螺旋形的叶綠体),所以講起来,很感困难,也总有些同学不了解它的真正构造。当时我制了个模型,解决了問題。我用一个烂了底的試管作水綿的細胞壁。我首先用较硬的紙卷起来(粗細能恰巧放在试管里),把剪成的窄条綠紙螺旋式地卷在紙卷上,外边涂上浆糊,放在試管里,松动紙卷,綠色紙条就沾在試管內壁上,然后卷紧紙卷抽出:细胞的叶綠体制成了。第二步,先在試 In the plant class, when it comes to hydroponics, its structure is not so different from that of a normal cell (the cell is in the shape of a cell, the cytoplasm is divided into two parts, the cytoplasmic filament, the spiral chloroplast) So speaking, very difficult, but also some students do not understand its true structure. At that time I made a model to solve the problem. I used a rotten test tube to make a sponge cell wall. I first roll it up with harder paper (the thickness just happens to be in the test tube), roll the narrowed piece of green paper spirally around the paper roll, apply a paste on the outside, place it in the test tube, loosen the paper roll, The green note sticks to the inner wall of the test tube, and then it is drawn out of the paper roll: the chloroplasts of the cells are made. The second step, first try