micropyle

简明释义

英[ˈmaɪkrəʊˌpaɪl]美[ˈmaɪkroʊpaɪl]

n. [植] 珠孔；[动] 卵孔

英英释义

单词用法

同义词

反义词

例句

1.The micropyle was formed by the inner integument.

珠孔由内珠被形成。

2.The micropyle is formed with inner integuments and partial outer integument.

珠孔由内珠被和腹侧外珠被构成。

3.The micropyle is formed with inner integuments and partial outer integument.

珠孔由内珠被和腹侧外珠被构成。

4.On this butterfly egg, the lacy pattern marks the micropyle, where sperm enters.

在这种蝴蝶卵上，花边图案标记精子进入的卵孔。

5.The micropyle is crucial for seed development, allowing nutrients to enter.

小孔对种子发育至关重要，允许营养物质进入。

6.The structure of the micropyle can vary significantly among different species.

不同物种之间，小孔的结构可能有显著差异。

7.In many plants, the micropyle serves as the entry point for the sperm cells.

在许多植物中，小孔作为精子细胞的入口。

8.The fertilization process begins when the pollen grain lands on the micropyle.

当花粉粒落在小孔上时，受精过程开始。

9.During germination, the seed absorbs water through the micropyle.

在发芽过程中，种子通过小孔吸收水分。

作文

In the fascinating world of botany, one term that often comes up in discussions about plant reproduction is micropyle. The micropyle is a small opening in the ovule of seed plants, serving as a crucial gateway for fertilization. Understanding the role of the micropyle can provide insights into the intricate processes that govern plant life and reproduction. The micropyle is typically located at one end of the ovule, which is the structure that develops into a seed after fertilization. When pollen grains land on the stigma of a flower, they germinate and form a pollen tube that grows down through the style towards the ovule. The micropyle facilitates this process by allowing the pollen tube to enter the ovule, where it will deliver the sperm cells necessary for fertilization. This process is vital for the formation of seeds, which are essential for the propagation of many plant species.One interesting aspect of the micropyle is its variability among different plant species. In some plants, the micropyle is quite pronounced and easily identifiable, while in others, it may be more subtle or even difficult to locate. This variation can influence how effectively a plant can reproduce, as the size and accessibility of the micropyle can affect the success rate of fertilization. For instance, in certain species, the positioning of the micropyle can help protect the ovule from environmental factors or pests, thus enhancing reproductive success.Moreover, the micropyle plays a significant role in the later stages of seed development. After fertilization occurs, the ovule transforms into a seed, and the micropyle remains as a small scar on the seed coat. This scar is often referred to as the 'hilum' and serves as a reminder of the seed's origin. When conditions are favorable, water can enter the seed through the micropyle, triggering the germination process. This highlights the importance of the micropyle not only in fertilization but also in the eventual growth of new plants.In summary, the micropyle is a small yet significant feature in the reproductive anatomy of seed plants. It serves as the entry point for the pollen tube during fertilization and plays a critical role in the development of seeds. By understanding the function and significance of the micropyle, we can appreciate the complexity of plant reproduction and the delicate balance of nature that allows for the continuation of plant species. As we delve deeper into the study of botany, the micropyle stands out as a testament to the wonders of plant life and the intricacies of their reproductive strategies.

在植物学这个迷人的领域中，一个常常出现在植物繁殖讨论中的术语是micropyle。micropyle是种子植物胚珠中的一个小开口，作为受精的重要通道。理解micropyle的作用可以为我们提供关于植物生命和繁殖过程的复杂性的重要见解。micropyle通常位于胚珠的一端，胚珠是受精后发展成种子的结构。当花粉粒落在花的柱头上时，它们会发芽并形成一根花粉管，沿着花柱向下生长，直达胚珠。micropyle通过允许花粉管进入胚珠来促进这一过程，在那里它将输送必要的精子细胞进行受精。这个过程对于种子的形成至关重要，而种子对于许多植物物种的繁殖是必不可少的。一个有趣的方面是，不同植物物种之间micropyle的变异性。在某些植物中，micropyle非常明显且易于识别，而在其他植物中，它可能更微妙甚至难以找到。这种变异可能会影响植物的繁殖效率，因为micropyle的大小和可及性可能会影响受精的成功率。例如，在某些物种中，micropyle的位置可以帮助保护胚珠免受环境因素或害虫的侵害，从而增强繁殖成功率。此外，micropyle在种子发育的后期阶段也起着重要作用。受精发生后，胚珠转变为种子，micropyle作为种皮上的一个小伤疤而保留。这个伤疤通常被称为“种脐”，并作为种子起源的提醒。当条件适合时，水分可以通过micropyle进入种子，触发发芽过程。这突显了micropyle在受精和新植物最终生长中的重要性。总之，micropyle是种子植物生殖解剖结构中一个小而重要的特征。它作为受精过程中花粉管的入口，并在种子发育中发挥关键作用。通过理解micropyle的功能和重要性，我们可以欣赏植物繁殖的复杂性以及自然界的微妙平衡，这使得植物物种得以延续。当我们深入研究植物学时，micropyle成为植物生命奇迹和其繁殖策略复杂性的证明。