有关生长素的热点命题方略

• 作 者: 晁建怀
• 出 处: 高中生
• 发表日期: 2005年02期
• 关键词: 胚芽鞘 参考答案 直立生长 向光 实验方案设计 抽象思维能力 综合分析能力 知识迁移 水平放置 生长方向

一、命题热点之一———胚芽鞘尖端尖端是接受光刺激的部位,也是合成生长素最活跃的部位。1.基础命题例1把燕麦胚芽鞘尖端放在琼脂切块上,正中插入生长素不能透过的云母片,琼脂被分成相等的两部分(见图1)。用单侧光照射后,琼脂块内的生长素含量将是A.左右相等B.左右均无C.左多

One of the propositional hotspots—the tip of the coleoptile is the part that receives light stimulation, and is also the most active part of the synthetic auxin. 1. Basic Propositions Example 1 The tip of the oat coleoptile was placed on an agar slice and auxin impervious mica plate was inserted in the center. The agar was divided into two equal parts (see Figure 1). After irradiation with a single side of light, the auxin content in the agar block will be A. Left and right are equal to B. There is no C. Left and right.