gymnosperm造句

• Its native gymnosperms could evolve into a few species capable of growing in the warm, moist forests of queensland .
  本地的裸子植物可进化成能在昆士兰温暖湿润林区的树种。
• The occurrence of haploid endosperm in the gymnosperms provides a sound basis for further investigations into progenies .
  裸子植物中单倍体胚乳的存在，为进一步对于后代的研究提供良好的基础。
• Most angiosperm ovules possess two integuments , while gymnosperms usually have only one
  大多数被子植物的胚珠有两层珠被，而裸子植物通常只有一层。
• Most gymnosperms retain archegonia except for the most advanced genera gnetum and welwitschia
  除了买麻藤属和百岁兰属以外大多数裸子植物还保留有颈卵器。
• Antherozoid ( spermatozoid ) the male gamete of algae , some gymnosperms , and the non - seed - bearing plants
  游动精子：藻类，某些裸子植物和没有种子形成的植物中的雄性配子。
• The process is restricted to certain angiosperms but a primitive form is known from some gymnosperms
  此过程仅限于某些被子植物，但从裸子植物中也发现了一些较原始的形式。
• Gymnosperm a general term for any seed plant except the angiosperms , characterized by bearing naked seeds
  裸子植物：被子植物以外的种子植物统称裸子植物，以种子裸露为特征。
• However , the variation patterns of rdna in gymnosperms are little known because of the limited sequence data
  但是在裸子植物中由于研究资料的匮乏，使我们对裸子植物rdna的变异模式了解甚少。
• Bract scale the structure found in large numbers in the female cone of gymnosperms , each bearing an ovuliferous scale in its axil
  苞鳞：在裸子植物的雌球果中大量存在的结构，每个苞鳞都包含一个珠鳞。
• Enclosure of the nucellus by the integuments is incomplete , the embryo sac or , in gymnosperms , to the archegonium
  珠被并不是将珠心完全封闭，而是留有珠孔以便受精时花粉管进入胚囊，或裸子植物的藏卵器。
• Pollen mother cell ( pmc ) in angiosperms and gymnosperms , a somatic cell that gives rise to four haploid pollen grains by meiosis
  花粉母细胞（ pmc ） ：指在被子植物和裸子植物中，能通过减数分裂产生4个单倍体花粉粒的体细胞。
• The carpel is homologous with the megasporophylls of certain spore - bearing vascular plants ( pteridophytes ) and the ovuliferous scales of gymnosperms
  心皮和能产生孢子的维管植物（羊齿类）还有具胚珠的裸子植物的大孢子叶是同源的。
• Gymnosperms lack endosperm and the precise double fertilization characteristic of the angiosperms , although some show a primitive form of it
  尽管裸子植物还保留有某些被子植物的基本形态，但它没有被子植物所特有的胚乳以及双受精现象。
• They differ from conifers and other gymnosperms by having the ovule enclosed within an ovary , which after fertilization develops into a fruit
  被子植物不同于针叶植物和其他的裸子植物，被子植物的胚珠由子房所包被，受精后直接发育为果实。
• In the clubmosses and horsetails only one type of strobilus is formed , while in the gymnosperms female megastrobili and male microstrobili both develop
  石松和楔叶类只形成一种类型的球果，然而裸子植物既有雌性的大孢子叶球也有雄性的小孢子叶球。
• In many gymnosperms the nuclei divide within the pollen grain to produce a small number of cells ( 2 - 40 depending on the group ) representing the male prothallus
  在许多裸子植物中，细胞核在花粉粒中分裂以产生少量的细胞（ 2 40个，取决于不同种类） ，代表雄性原叶体。
• Albuminous cell 1 . a vertically elongated parenchyma cell , found in groups in the rays of the secondary phloem in gymnosperms , where they are associated with sieve cells
  蛋白质细胞： 1 .在裸子植物的次生韧皮部薄壁组织和韧皮射线中发现的1种垂直伸长的细胞，通常与筛胞相结合。
• Till today there is no report on molecular evolution of 5s rdna in pinus . thus , the rdna variation pattern and organization in gymnosperm genomes are the primary focus of the present project
  8s - 26srdna位点数平均较被子植物多， 5srdna除pinusradiata外，在其它种里则与被子植物相似。
• Strobilus ( pl . strobili ) a group of sporophylls ( spore - bearing leaves ) arranged around a central axis , found in gymnosperms , lycophyta ( clubmosses ) , and sphenophyta ( horsetails )
  球果：孢子叶向中轴聚拢形成的结构，存在于裸子植物门植物、石松亚门植物（石松）和木贼纲植物中（楔叶类） 。
• He also observed that gymnosperm ovules were not enclosed in an ovary wall , leading to the establishment of one of the basic differences between angiosperms and gymnosperms
  他还观察到裸子植物的胚珠并不是被子房壁包围，这个发现直接导致了被子植物和裸子植物之间最根本的几点区别的建立。