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纵观近几年全国各地的高考题,我们不难发现其中有几套题不谋而合的以种子萌发为背景考察了很多相关的知识,本文对此进行了初步的总结,望对广大考生在进行复习的时候有所帮助.一、背景知识种子萌发,是指种子的胚从相对静止状态变为生理活跃状态,并长成营自养生活的幼苗的过程.生产上往往以幼苗出土为结束.种子萌发的前提是种子具有生活力,解除了休眠,部分植物的种子还需完成后熟过程.种子萌发需要具备的三个外界条件分别是充足的水分、适宜的温度、足够的氧气,而内部还有各种植物激素的变化.
Looking at the college entrance examination questions in various parts of the country in recent years, it is not difficult to find that there are several sets of questions that coincide with the background of seed germination as a background to examine a lot of relevant knowledge. This article has made a preliminary summary of this, and hopes to examine candidates. It helps when reviewing. First, background knowledge Seed germination refers to the process in which the seed embryo changes from a relatively static state to a physiologically active state, and grows into a seedling for self-supporting life. The production is often excavated from seedlings. The end of the seed germination is based on the premise that the seeds have viability, the dormancy is released, and the seeds of some plants need to complete the ripening process. The three external conditions that the seeds need to germinate are adequate moisture, suitable temperature, and sufficient oxygen. And there are various internal plant hormone changes.