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The megagametophyte within the ovule of a flowering plant.

胚囊 Embryo sac 有花植物胚珠雌配子体。

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An ovule which is curved so that the micropyle is positioned near the funiculus and the chalaza.

胚珠 Campylotropous ovule 珠孔邻近珠柄和合胚珠

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The larger embellum could be used as a secondary screening indicator for identifying aposporous embryo sac in Apluda mutica.

存在发达胚珠附器是水蔗草无孢子生殖胚囊之一.

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The carpel is homologous with the megasporophylls of certain spore-bearing vascular plants (pteridophytes) and the ovuliferous scales of gymnosperms.

心皮和能产生孢子维管植物(羊齿类)还有具胚珠裸子植物大孢子叶是同源

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Stigma subsessile, penicillate-capitate. ovule orthotropous.

胚珠直生

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中高级英语短

In the latest study, the team used micro-CT technology to scan the fossil and found that the interior contained inverted ovules, which is a key feature for determining angiosperms.

研究中,该团队使用微型 CT 技术扫描化石,发现部包含倒置胚珠,这是确定被子植物关键特

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物种起源

In certain whole groups of plants the ovules stand erect, and in others they are suspended; and within the same ovarium of some few plants, one ovule holds the former and a second ovule the latter position.

某些整群植物中, 胚珠直立,而些植物群中, 胚珠则悬空;少数植物子房胚珠占据前者位置, 第二胚珠占据后者位置。

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物种起源

If so, the position of the ovules, even when one is erect and the other suspended within the same ovarium, would follow the selection of any slight deviations in position which favoured their fertilisation, and the production of seed.

如果是这样, 胚珠位置, 即使直立而另悬置子房,也将遵循有利于它们受精和种子生产任何轻微位置偏差选择。

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