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【简答题】
某生物兴趣小组设计了如下实验步骤探究“温度对种子萌发的影响”。 步骤1：取A、B两种植物的种子各150粒，同种植物的种子取自同一批，且饱满、大小基本相同。 步骤2：将A种植物种子平均分成A 1 、A 2 、A 3 三组，B种植物种子平均分成B 1 、B 2 、B 3 三组。六组种子分别同时按照如下表格中处理： 步骤3：4 天后同时观察并统计 ② 。 （1）请完善实验步骤2和实验步骤3 （2）请设计记录实验结果的表格。 （3）实验后发现，A种植物种子中A 1 、 A 3 组均未萌发，A 2 组种子大多数萌发，该实验结果说明 ；B种植物种子三组均未萌发，B 2 组未萌发的原因可能有 （至少写出两点）。 （4）A种植物种子萌发时所需的有机物来自自身的 （填结构名称）。
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