pappus

简明释义

英[ˈpæpəs]美[ˈpæpəs]

n. [植] 冠毛

复 数 p a p p i

英英释义

单词用法

同义词

反义词

例句

1.Some examples are given by inscribed and circumscribed circles of polygons, lines intersecting and tangent to conic sections, the Pappus and Menelaus configurations of points and lines.

一些例子所给予者和限制各界的多边形，线相交和相切的圆锥部分，帕普斯和墨涅拉俄斯配置的点和线。

2.Some examples are given by inscribed and circumscribed circles of polygons, lines intersecting and tangent to conic sections, the Pappus and Menelaus configurations of points and lines.

一些例子所给予者和限制各界的多边形，线相交和相切的圆锥部分，帕普斯和墨涅拉俄斯配置的点和线。

3.Achenes 8 - ribbed, white pilose; pappus scabrous, 10-12 mm long, connate at base.

瘦果纺锤形，具8条纵棱，被白色长柔毛；冠毛粗糙，长10 - 12毫米，基部联合。

4.When the wind blows, the pappus of the milkweed plant carries its seeds far away.

当风吹过时，奶草植物的冠毛将种子远远地带走。

5.The pappus can be seen as a parachute, allowing seeds to float through the air.

可以把冠毛看作是降落伞，使种子在空中飘浮。

6.The fluffy white tufts of the dandelion are its pappus, which help in seed dispersal.

蒲公英的白色绒毛就是它的冠毛，有助于种子的传播。

7.Botanists study the structure of the pappus to understand how plants adapt to their environments.

植物学家研究冠毛的结构，以了解植物如何适应环境。

8.Some species of plants have a more elaborate pappus than others, aiding in their reproduction.

某些植物的冠毛比其他植物更复杂，有助于它们的繁殖。

作文

The term pappus refers to a unique structure found in certain flowering plants, particularly within the Asteraceae family, which is commonly known as the daisy or sunflower family. The pappus is essentially a modified calyx that consists of fine, hair-like structures or bristles that help in the dispersal of seeds. These structures play a crucial role in the plant's reproductive process by aiding in the wind dispersal of seeds, allowing them to travel over considerable distances. This adaptation is particularly beneficial for species that grow in open environments, where competition for resources can be fierce.Understanding the function of the pappus can provide insights into how plants have evolved to survive and thrive in various ecological niches. For instance, dandelions, which are perhaps one of the most recognizable examples of plants with a pappus, have a fluffy, white seed head that is easily carried by the wind. When the seeds detach from the flower, the pappus acts like a parachute, allowing the seeds to float away and settle in new locations where they can germinate and grow into new plants.In addition to aiding in seed dispersal, the pappus can also provide some protection to the developing seeds. By covering the seeds, the pappus can shield them from harsh environmental conditions, such as extreme temperatures or moisture loss. This protective feature enhances the chances of seed survival until they are ready to germinate.Moreover, the diversity of pappus structures among different species highlights the incredible adaptability of plants. Some plants have a very fine, feathery pappus, while others may have a more rigid and spiky appearance. This variation is often linked to the specific habitats in which the plants grow. For example, plants in windy areas may develop a more robust pappus to ensure that their seeds remain airborne for longer periods, increasing their chances of reaching suitable soil.The study of the pappus not only contributes to our understanding of botany but also has practical implications for agriculture and horticulture. By recognizing the importance of seed dispersal mechanisms, farmers and gardeners can make informed decisions about planting and cultivating various species. This knowledge can lead to better crop yields and more effective management of plant populations.In conclusion, the pappus is an essential component of many flowering plants, serving multiple functions that enhance seed dispersal and protect developing seeds. Its fascinating adaptations demonstrate the intricate relationships between plants and their environments. As we continue to explore the complexities of plant biology, the study of structures like the pappus will undoubtedly reveal even more about the wonders of nature and the remarkable strategies that organisms employ to survive and reproduce in a constantly changing world.

术语pappus指的是某些开花植物中发现的一种独特结构，特别是在菊科（Asteraceae）家族中，这个家族通常被称为雏菊或向日葵家族。pappus本质上是一个改良的萼片，由细小的、毛状的结构或刚毛组成，帮助种子的传播。这些结构在植物的繁殖过程中发挥着至关重要的作用，通过帮助种子随风散播，使它们能够在相当大的距离内传播。这种适应性对于生长在开放环境中的物种尤其有益，在这些环境中，资源竞争可能非常激烈。理解pappus的功能可以提供关于植物如何进化以在各种生态位中生存和繁衍的见解。例如，蒲公英可能是具有pappus的植物中最具代表性的例子，它们有一个蓬松的白色种子头，容易被风带走。当种子从花朵上脱落时，pappus就像一个降落伞，允许种子漂浮并在新的地方安顿下来，在那里它们可以发芽并成长为新植物。除了帮助种子传播之外，pappus还可以为正在发育的种子提供一定的保护。通过覆盖种子，pappus可以保护它们免受恶劣环境条件的影响，例如极端温度或水分流失。这种保护特性增强了种子存活的机会，直到它们准备好发芽。此外，不同物种之间pappus结构的多样性突显了植物惊人的适应能力。有些植物拥有非常细腻的、羽毛状的pappus，而其他植物可能具有更坚硬和尖锐的外观。这种变化通常与植物生长的特定栖息地相关。例如，生长在多风地区的植物可能会发展出更强健的pappus，以确保它们的种子能在空中停留更长时间，从而增加它们到达适合土壤的机会。对pappus的研究不仅有助于我们理解植物学，还对农业和园艺具有实际意义。通过认识到种子传播机制的重要性，农民和园丁可以做出明智的选择，关于种植和培育各种物种。这种知识可以导致更好的作物产量和更有效的植物种群管理。总之，pappus是许多开花植物的重要组成部分，具有多种功能，增强种子传播并保护正在发育的种子。它的迷人适应性展示了植物与其环境之间复杂的关系。随着我们继续探索植物生物学的复杂性，像pappus这样的结构的研究无疑会揭示更多关于自然奇迹和生物体在不断变化的世界中生存和繁殖所采用的非凡策略。