Ovule

Plant ovules: Gymnosperm ovule on left, angiosperm ovule (inside ovary) on right

Models of different ovules, Botanical Museum Greifswald

In seed plants, the ovule ("small egg") is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: The integument(s) forming its outer layer(s), the nucellus (or remnant of the megasporangium), and female gametophyte (formed from haploid megaspore) in its center. The female gametophyte—specifically termed a megagametophyte—is also called the embryo sac in angiosperms. The megagametophyte produces an egg cell (or several egg cells in some groups) for the purpose of fertilization. After fertilization, the ovule develops into a seed.

单词	ovular
释义	ovular /'əʊvjʊlə//'ɑvjʊlɚ/ 英汉-汉英词典 adj. 胚珠的,卵子的词组 \| 习惯用语您要查找的是不是： ocular adj. 眼睛的；视觉的；目击的 n. 目镜 ovulate vi. 排卵 adj. 具胚珠的 uvular adj. 悬壅垂的；小舌音的 ovulatory adj. 产卵的;排卵的网络短语: ovular mamelon 珠阜 ovular hemiphyll 胚珠半叶 ovular abortion 翻译 ovular r 胚珠的 ovular membrane 卵黄膜 ovular protein 胚珠蛋白 ovular membrane barrier 卵膜屏障 ovular abortion detail 卵流产英语例句库 A central ring creates an ovular oculus which is the center-point of the space. 一个中心环状横梁在整个空间的中央建造了一个圆形舞台。 The feature of ovular uterine bleeding disorder is regular menstrual cycle with short cycle, abnormal heavy menstruation, longer period but self ceasing. 有排卵子宫异常出血月经周期相对有规律，主要表现为周期缩短、经量异常增多、经期较长但能自止。A central ring creates an ovular oculus which is the center-point of the space. 一个中心环状横梁在整个空间的中央建造了一个圆形舞台。 The feature of ovular uterine bleeding disorder is regular menstrual cycle with short cycle, abnormal heavy menstruation, longer period but self ceasing. 有排卵子宫异常出血月经周期相对有规律，主要表现为周期缩短、经量异常增多、经期较长但能自止。声明：以上例句、词性分类均由互联网资源自动生成，未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。原声例句陪你入睡 My pointless meanders and superfluous tangents do go more ovular around, oval around, around, oval around. 我毫无意义的蜿蜒和多余的切线确实变得更加卵形，椭圆形，椭圆形，椭圆形。英语百科 Ovule In seed plants, the ovule ("small egg") is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: The integument(s) forming its outer layer(s), the nucellus (or remnant of the megasporangium), and female gametophyte (formed from haploid megaspore) in its center. The female gametophyte—specifically termed a megagametophyte—is also called the embryo sac in angiosperms. The megagametophyte produces an egg cell (or several egg cells in some groups) for the purpose of fertilization. After fertilization, the ovule develops into a seed. 近义、反义、联想词近义词 adj. ovule, ovum, egg cell 联想词 oval卵形的;elongated细长的;triangular三角形的;rectangular矩形的;spherical球的;cylindrical圆柱形的;conical圆锥形的;circular圆形的;hexagonal六角形的;octagonal八边形的;concave凹的，凹面的; 英英词典 ovular adj. being or of the nature of an ovule of or relating to an ovum
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ovular /'əʊvjʊlə//'ɑvjʊlɚ/

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Ovule

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联想词