2019二年级语文上册课文414《我要的是葫芦》为什么叶子生病葫芦会落素材新人教版.docx

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1我要的是葫芦为什么叶子生病葫芦会落?我要的是葫芦一课中,种葫芦的人想要葫芦,但最终还是没得到葫芦,为什么呢?原来,葫芦这一植物是由根、茎、叶、花、果实、种子六部分组成的,其中根、茎、叶是为植物提供养料的营养器官,而叶子的作用更是不容忽视的。植物体的叶子具有呼吸作用,将体内的二氧化碳与空气中的氧气进行交换,为植物的生长提供能源;叶子还是植物进行蒸腾作用的主要器官,叶子将体内的水分散失到空气中,这样就可以促进根吸收土壤中的水分和无机盐;另外,叶子还有一个更重要的作用进行光合作用,生产植物生长所必须的“食物” 。葫芦是植物体的果实,如果叶子生病,就不能很好地完成呼吸、蒸腾、光合作用;植物体就不能得到充足的养料、水分,果实就会因为缺少养料、水分而不能很好地生长,因此没等到成熟就落地了。

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