- 更多网络例句与有两裂片的相关的网络例句 [注：此内容来源于网络，仅供参考]
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The ultrastructure characters of pollen grain in Brassica napus are:1There are vacuoles in cytoplasm but no starch grain in uniceelluar pollengrain.2The veget- ative nucleus of bicellular pollen grain is generally spheroidal;while the generative cell is spinde-shaped,with a big nucleus,thin layer of cytoplasmand few cell orgens,no cell wall.3In three-celled pollen grain the sperm cell is separated from the cytoplasm of vegetative cell by two layers of plasmic membrances.
Brassica napus的花粉粒，在不同发育时期超微结构的特征如下：1单胞花粉粒有一个球形的细胞核和明显的核仁，细胞质内出现液泡，缺少典型的淀粉粒。2双胞花粉粒的营养核多为球形。生殖细胞纺锤形，无细胞壁，细胞核比例大，细胞质呈薄层，细胞器少。3三胞花粉粒有一个裂片状的营养核和两个纺锤形的精细胞，精细胞无壁，以两层质膜与营养细胞的细胞质相隔。
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Two inner petals bifid, or sometimes between the 2 lobes, with a smaller one, shorter than fertile stamens
2裂的两内部花瓣，有时或在2裂片，具更小的一，短于可育雄蕊之间 12
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bilobular：有两裂片的
biliverdin 胆绿素 | bilobular 有两裂片的 | bilocellate 具两分室的