花粉

The pollen grains of yew tree are directly fallen on the micropyle by wind and enter pollen chamber at the top of nucellus through pollination drops, a sugary exudation rich in nutritious materials at the micropyle.

红豆杉的花粉，一般借助风力直接传播到珠孔端的传粉滴上。传粉滴是珠心组织的周期性分泌产物，它富含糖和氨基酸等营养物质。

At the early stage,spo- rogenous cells inside the microsporangium were seen grouping together into small aggregates each containing few cells.

由于不同的兰花所形成的花粉块的形状和结构有一定的差异，这些性状常被利用作分类之用〔3一习。

The primary sporogenous cells divided into the second sporogenous cells which would turn into microspore mother cells in a microsporangium. The cytokinesis in meiosis of the microspore mother cells was of modified simultaneous type, forming the decussate, isobilateral or T-shaped tetrads.

初生造孢细胞分裂形成次生造孢细胞，次生造孢细胞再转化为小孢子母细胞，小孢子母细胞减数分裂的胞质分裂为修饰性同时型，四分体排列方式为交叉型、对称型或"T"型，成熟花粉粒二细胞型，开花时散出。

Objective:To determine the self-compatibility of Platycodon grandiflorum and the location of microspore germination on stigma.

目的：确定桔梗的自交亲和性及花粉粒在柱头上的萌发部位。

Several polar phenomena in microspore and pollen were observed.

在小孢子和花粉粒发育过程中，有明显极性存在。

In L. davidii, the male plastids were stripped off during the division of microspore.

在生殖细胞的发育过程中，质体发生解体，到成熟花粉的生殖细胞只含线粒体，没有质体。

Pollen cones solitary or clustered, with numerous spirally arranged microsporophylls; microsporophyll with 2 microsporangia; pollen usually 2-saccate (nonsaccate in Cedrus , Larix , Pseudotsuga , and most species of Tsuga ).

雄球花单生或者丛生，有许多螺旋排列的小孢子叶；每个雄蕊有有2个花药；花粉通常有2个气囊状(无气囊，如Cedrus，Larix，Pseudotsuga 和大多数的Tsuga)。

Maize pollen is dispersed by the wind and often blows onto milkweed plants that grow near maize fields.

一些蝴蝶以m植物为食。一些蝴蝶吃了带有花粉的m的叶子，死了。

When, in experiments, these caterpillars were fed milkweed leaves dusted with pollen from modified maize plants, they died.

E答案：空中运动的花粉一般聚集在m植物中间的叶子，而蝴蝶只吃m植物上层柔软的叶子。

The total amount of pollen was measured more accurately by 30 millimetre deameter globes.

用直径30毫米的球形收集器，可以更准确地测定花粉的总量。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐