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14．双受精是被子植物所特有的双受精是指 A．一个卵细胞和两个精子相融合b．两个精子分别与卵细胞和极核相融合c．一个精子和两个极核相融合 Template






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tomski14．双受精是被子植物所特有的双受精是指 a．一个卵细胞和两个精子相融合b．两个精子分别与卵细胞和极核相融合c．一个精子和两个极核相融合 coloring
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14．双受精是被子植物所特有的双受精是指 A．一个卵细胞和两个精子相融合B．两个精子分别与卵细胞和极核相融合C．一个精子和两个极核相融合 sketch template
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14．双受精是被子植物所特有的双受精是指 A．一个卵细胞和两个精子相融合B．两个精子分别与卵细胞和极核相融合C．一个精子和两个极核相融合 sketch template
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下图是被子植物受精作用和育过程示意图请据图回答下列问题 1如图中所示花粉管中的一个精子与6 结合后称为 将来育成 ——青夏 sketch template
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下面是绿色植物受精过程种子芽和植株结构示意图请认真观察图示并分析回答1绿色植物育的起点是 在图一 中形成的2受精卵 sketch template
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题目读花的结构和双受精过程示意图据图分析回答问题1图1中的 和 与果实和种子的形成有直接关系它们是花的主要结构2图2中 sketch template
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14．双受精是被子植物所特有的双受精是指 A．一个卵细胞和两个精子相融合B．两个精子分别与卵细胞和极核相融合C．一个精子和两个极核相融合 sketch template
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18．如图是双受精过程示意图据图分析回答问题．1填写各部分名称A．子房壁B．珠被C．极核D．卵细胞E．花粉F．花粉管G sketch template
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有性生殖就是由受精卵受精卵育新个体的生殖方式．无性生殖就是不经过两性生殖细胞两性生殖细胞的结合由母体母体直接产生新个体的生殖方式． 题目和 sketch template
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