“珠被”造句
2024年07月01日 03:43:58
某些植物的
珠被和珠心細(xì)胞形成完全正常的胚.
The cells of the integument and nucellus of some plants form perfectly normal embryos.
大多數(shù)被子植物的胚珠有兩層
珠被, 而裸子植物通常只有一層.
Most angiosperm ovules possess two integuments, while gymnosperms usually have only one.
外種皮:覆蓋在種子外部的堅(jiān)硬干燥的保護(hù)層, 由胚珠的
珠被發(fā)育形成.
Testa The hard dry protective covering of a seed, formed from the integuments of the ovule.