图是大豆种子和玉米种子的结构示意图，请根据图回答：（1）图中子叶指
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（1）菜豆种子中1胚轴，2胚根，3种皮，4胚芽，5子叶；玉米种子中6种皮，7胚芽，8胚轴，9胚根，10胚乳，11子叶（2）菜豆种子由3种皮和胚组成，玉米种子由6种皮、胚和10胚乳三部分组成，胚是发育新植物体幼苗的结构；菜豆种子的胚由胚芽、胚轴、胚根和两片子叶组成，子叶中储存有丰富的营养物质，玉米种子的胚由胚芽、胚轴、胚根和一片子叶组成，胚乳是储存养料的结构；
故答案为：（1）5、11；4、7；2、9；1、8；（2）胚乳
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