以下为句子列表：
英文: Antipodal cells The three haploid cells found in the embryo sac of seed-bearing plants that migrate to the chalaxal end of the sac farthest from the micropyle.
中文: 反足细胞：胚囊三次分裂形成卵细胞，助细胞和极核等，其中位于合点端的三个单倍体细胞称反足细胞。
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英文: Enclosure of the nucellus by the integuments is incomplete, the embryo sac or, in gymnosperms, to the archegonium.
中文: 珠被并不是将珠心完全封闭，而是留有珠孔以便受精时花粉管进入胚囊，或裸子植物的藏卵器。
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英文: It is concluded that embryo sac sterility was the main reason for highly stable seedless characteristic of Lipeng No.2 cultivar.
中文: 因此，胚囊高度败育是丽椪2号产生无核的主要原因。
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英文: Observation by paraffin section showed that Lipeng No.2 embryo sac mother cells were almost entirely degenerated during megasporogenesis.
中文: 切片观察发现，丽椪2号胚囊母细胞在四核期已完全退化。
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英文: The concept of an alternation of generations can be extended to the flowering plants, in which the embryo sac and pollen represent the much reduced famale and male gametophyte generations respectively.
中文: 这个概念也可以运用在有花植物上，由胚囊和花粉各自表达雌雄配子体世代。
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