1.实验前将盆花天竺葵或其它植物遮光处理1—2天。然后剪取两片带叶柄的叶片,分别插入两个装有清水的小瓶内。 2.取250毫升广口瓶或罐头瓶两个,甲瓶装入氢氧化钠颗粒5克或氢氧化钾溶液30毫升,乙瓶内装入适量清水。 3.把插有叶片的小瓶分别放入甲、乙广口瓶内。甲瓶口涂凡士林,然后盖一块毛玻璃封口;乙瓶不封口(右下图)。甲、乙两瓶同时放置 1. Before the experiment potted geranium or other plants shading treatment 1-2 days. Then two leaves with petioles are cut and inserted into two vials filled with fresh water. 2. Take 250 ml jars or canned bottles two, a bottle of sodium hydroxide particles into 5 grams or 30 ml of potassium hydroxide solution, B bottle into the amount of water. 3. Insert the vial into the vial, B wide jar. A bottle of Vaseline painted mouth, and then cover a piece of ground glass seal; B bottle is not sealed (right below). A, B two bottles placed at the same time