The ovule is bitegminous and tenuinucellate.The archesporial cell locates under the nucellus epidermis, which develops into fuctional megasporocyte.
孢原细位于珠心表
,直接起大孢子母细
的功能。
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Matrix producers pump out the extracellular goo, swimmers assemble flagella and are free to move about or migrate, and spore-formers produce dormant, tough endospores that survive starvation, temperature extremes, and harmful radiation.
基质制造者能够分泌胞外粘性物质,鞭毛可以自由活动和迁移,芽
生产休眠、坚硬的
子内壁,
子内壁能够在饥饿、极端温度、以及有害射线下生存。
Sentence 73 These plants propagate by producing spores—-tiny fertilized cells that contain all the instructions for making a new plant—-but the spores are unprotected by any outer coating and carry no supply of nutrient.
这些植物通过产生子来繁殖——
子是一些微小的已受精
胞,它们携带了生成一株新植物的所有指令信息——但是
子没有任何外部表皮的保护,也没有营养供应。
This meant that they were really dependent on a wet environment, otherwise the spores would fail to grow - the different reproductive cells they contained needed a thin layer of water on the plant's surface to move around and come together.
这意味着它们确实依赖于潮湿的环境,否则子将无法生长——它们所含的不同生殖
胞需要在植物表面覆盖一层薄薄的水才能四处移动并聚集在一起。