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几年来,本刊曾陆续收到读者来信询问初中《植物学》课本“根的结构”一节中“根冠具有保护根尖的作用……”和“……在生长点附近的根冠细胞又不断地分裂出新细胞……”这两处提法是否有误。现答复如下。 1.来信认为课本中说“根尖包括四部分:根冠、生长点、伸长区和根毛区”,而后边接着说“根冠具有保护根尖的作用”,这就使人理解为根冠对上述四部分都有保护作用,但实际上又不可能。我们认为课本上前边的“根尖”是形态学惯用名词,而后边的根尖是指根的尖端,因此容易引起误会。实际上,根冠的主要功能在于保护幼嫩的分生组织免遭土粒的磨擦伤害;此外,有些
Over the past few years, this periodical has received letters from readers one after another asking about the “root canopy has the role of protecting the root tips” in the section “Structure of Roots” of the textbook “Botany” in junior high school.... and “... The root cap cells near the growing point. And constantly breaking up new cells...“ Whether the two formulations are wrong. The reply is as follows. 1. The letter believes that the textbook says that ”the apex includes four parts: the root crown, the growth point, the elongation zone, and the root hair zone.“ And then the phrase ”the root crown has the role of protecting the root tip.“ This makes people understand the root The crown has a protective effect on the above four parts, but in reality it is impossible. We believe that the ”root" on the front of the textbook is a morphological idiom, while the root of the posterior refers to the tip of the root, so it is easy to misunderstand. In fact, the main function of the root canopy is to protect the young meristem from the friction of the soil particles; in addition, some