gymnosperms

gymnosperms

美 [dʒɪm'nɒspəmz] 　英 [dʒɪm'nɒspəmz]

• n.【植】裸子植物
• 网络裸子植物类；裸子植物门；种子植物只分爲裸子植物

词形变化

复数：gymnosperms  

反义词

英汉解释

n.	1. 【植】裸子植物

英英解释

n.	1. a woody vascular plant in which the ovules are carried naked on the scales of a cone, e.g. a conifer, cycad, or ginkgo.

例句

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。

It has enabled gymnosperms and angiosperms to colonize dry terrestrial habitats where lower plants are unable to establish themselves.

它使裸子植物和被子植物得以在干旱的陆地上繁衍生息，而低等植物是无法做到的。

Only dicotyledonous flowering woody plants and most gymnosperms have true twigs; monocotyledons and tree ferns do not.

只有双子叶的木本开花植物和大部分的裸子植物才有真正的小枝，而单子叶植物和树蕨类植物则没有。

primitive tropical gymnosperms abundant in the Mesozoic, now reduced to a few scattered tropical forms.

跃于中生代，现在退化为一些分散的热带形式。

Based on this database, we chose the part of gymnosperms and gave a discussion to the features of its chromosomes' evolution and variation.

基于数据库的统计资料，我们选取了裸子植物类群对其染色体的变异和演化特征做了探讨。

In gymnosperms , the egg into the neck with only one of the two sperm and egg fusion.

在裸子植物中，进入颈卵器的两个精子只有一个与卵融合。

Late Permian a ginkgo, cycads, the cycads, conifers and other gymnosperms , the show began with the appearance of health.

晚二叠世出现了银杏、苏铁、本内苏铁、松柏类等裸子植物，开始呈现中生带的面貌。

used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales.

用于某些分类系统中；一个灭绝的裸子植物化石群，与苏铁蕨目同域。

an ancestral fossil type from which modern gymnosperms are thought to have derived.

作为今天被子植物祖先的原始化石品种。

A multicellular, often flask - shaped, egg - producing organ occurring in mosses, ferns, and MOST gymnosperms.

藏卵器在苔藓、蕨类及大多数裸子植物中的多细胞的，常为烧瓶状的产生卵子的器官

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。

These genes are characterized by several distinct motifs and exist in ferns, gymnosperms , and angiosperms.

该类基因具有特征性基元，并存在于蕨类植物、裸子植物和被子植物中。

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。

Title An outline of embryological characters of gymnosperms in relation to systematics and phylogeny.

裸子植物的胚胎学特征及其与分类、系统发育的关系。

In gymnosperms it gives rise to the body cell and stalk cell.

裸子植物的生殖细胞可形成体细胞和柄细胞。

Different opinions on the origins and evolutions of pteridophytes and gymnosperms.

蕨类植物和裸子植物的起源与进化。

Archegonium The female sex organ of the mosses, ferns, club mosses, horsetails, most gymnosperms, and some red and brown algae.

一些苔藓，蕨类，红藻，褐藻和裸子植物中的雌性生殖器官。

integument A layer surrounding the nucellus in the ovules of gymnosperms and angiosperms.

是裸子植物和被子植物的胚珠中包裹珠心的结构。

Gymnosperms , the majority still retain the structure neck eggs, eggs in egg-neck in the formation.

裸子植物中的大多数仍保留颈卵器的结构，卵在颈卵器内形成。

Late Triassic, gymnosperms , the mainland has become the real rulers of the main plant.

晚三叠世时，裸子植物真正成了大陆植物的主要统治者。

Carboniferous period, the early gymnosperms (such as etc. ) is very impressive, but the number of ferns most abundant.

石炭纪时，早期的裸子植物（如苏铁、松柏、银杏等）非常引人注目，但蕨类植物的数量最为丰富。

Areography of the gymnosperms of China (1): Distribution of the Pinaceae of China.

中国裸子植物分布区的研究（1）——松科植物的地理分布。

In the gymnosperms the megaspore gives rise to a cell that is termed the embryo sac because of its similarity to the angiosperm structure.

在裸子植物中，大孢子也产生一个细胞，因为它类似于被子植物的胚囊细胞，故也可以称之为胚囊。

These results have some significance in understanding the phylogeny of Ginkgo biloba and reproductive evolution of gymnosperms.

这些对探讨银杏的系统地位及裸子植物的生殖演化具有一定意义。

Gymnosperms to the development of terrestrial Jisheng period.

陆生的裸子植物发展到极盛期。

cone-bearing gymnosperms dating from the Carboniferous period;

产生于石炭纪的有球果的裸子植物；

Studies on free radical scavenging activities of extracts from fresh leaves of some Gymnosperms

一些裸子植物鲜叶提取物清除自由基的活性研究

A floristic analysis on the gymnosperms of Sichuan

四川裸子植物区系研究

Are all seeds of gymnosperms naked

裸子植物的种子是否都是裸露的