gymnosperm

简明释义

英[ˈdʒɪmnəʊˌspɜːm]美[ˈdʒɪmnəˌspɜːrm]

n. [植] 裸子植物

英英释义

单词用法

同义词

反义词

例句

1.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。

2.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。

3.It has also been found that the gymnosperm plants have few copies of CHS gene in a particular nuclear genome, but copy number varies greatly in the angiosperm plants.

CHS基因在裸子植物中的拷贝数较少，而在被子植物中拷贝数变化很大。

4.Contrary to common variation type in Angiosperms, the variation from high unsymmetric karyotype to low unsymmetric karyotype was found in existence in Gymnosperm.

与一般植物染色体的常见变异形式相反，在裸子植物中存在从高不对称性到低不对称的变异形式。

5.In Mesozoic, Guangdong flora had a big change, the gymnosperm was prosperous, but it was evolved from the late Paleozoic Cathaysian flora as a whole.

中生代，广东植物区系成分发生了很大的变化，裸子植物大量繁盛，但总体上是在本区晚古生代华夏植物区系的基础上演化而来的。

6.Rock plant, based on natural taxonomy system is classified into bryophyte, pteridophyte, gymnosperm, angiosperms;

岩生植物按自然分类系统分为苔藓植物、蕨类植物、裸子植物、被子植物。

7.By data collection of the database, we analyzed chromosome features of the group Gymnosperm.

在数据库的统计数据基础上，我们分析了裸子植物的染色体特征。

8.What recorded them were embryos of angiosperm and gymnosperm.

记忆它们的是被子植物和裸子植物等胚种。

9.The pine tree is a common example of a gymnosperm 裸子植物 found in many forests.

松树是许多森林中常见的gymnosperm 裸子植物的例子。

10.Many gymnosperms 裸子植物 produce cones instead of flowers.

许多gymnosperms 裸子植物产生的是圆锥体而不是花。

11.The seeds of gymnosperms 裸子植物 are exposed rather than enclosed in a fruit.

在gymnosperms 裸子植物中，种子是暴露的，而不是封闭在果实中。

12.Some gymnosperms 裸子植物 can live for thousands of years, like the Bristlecone pine.

一些gymnosperms 裸子植物可以活几千年，比如布里斯托尔松。

13.The Ginkgo biloba is a unique species of gymnosperm 裸子植物 known for its fan-shaped leaves.

银杏是一种独特的gymnosperm 裸子植物，以其扇形叶子而闻名。

作文

The world of plants is incredibly diverse, and among the various classifications, one interesting group is the gymnosperm. The term gymnosperm refers to a group of seed-producing plants that includes conifers, cycads, and ginkgo. Unlike angiosperms, which produce flowers and seeds enclosed in fruits, gymnosperms have seeds that are not enclosed. This characteristic is one of the defining features of gymnosperms. Gymnosperms are often characterized by their needle-like leaves and woody structures, making them well adapted to various environmental conditions. They can be found in many parts of the world, from the cold northern latitudes to tropical regions. Some common examples of gymnosperms include pine trees, fir trees, and cedar trees. These plants play a significant role in their ecosystems, providing habitat and food for numerous species. One of the most fascinating aspects of gymnosperms is their reproductive process. They reproduce using cones, which contain the reproductive organs. Male cones produce pollen, while female cones contain ovules that develop into seeds after fertilization. This method of reproduction is quite ancient, dating back to over 300 million years ago, which makes gymnosperms some of the oldest living plants on Earth. In addition to their ecological significance, gymnosperms have considerable economic value. Many species are harvested for their timber, which is used in construction and furniture making. The resin produced by certain gymnosperms, such as pines, is also valuable for producing products like turpentine and rosin. Furthermore, some gymnosperms produce edible seeds, such as pine nuts, which are a popular ingredient in various cuisines. Despite their importance, gymnosperms face several threats today. Habitat destruction, climate change, and invasive species are just a few challenges that impact their populations. Conservation efforts are essential to protect these ancient plants and ensure their survival for future generations. Educating the public about the significance of gymnosperms can help foster a greater appreciation for biodiversity and the need for sustainable practices. In conclusion, gymnosperms are a remarkable group of plants with unique characteristics and vital roles in our ecosystems. Their resilience and adaptability have allowed them to thrive for millions of years, but they require our attention and protection to continue thriving in the face of modern challenges. Understanding and appreciating gymnosperms not only enriches our knowledge of plant life but also highlights the interconnectedness of all living organisms on our planet. By studying and preserving these ancient plants, we contribute to the overall health and diversity of our environment.

植物的世界是极其多样化的，其中一个有趣的分类群体是裸子植物。术语裸子植物指的是一类产种子的植物，包括松柏类、苏铁类和银杏。与产生花朵和果实中封闭种子的被子植物不同，裸子植物的种子是没有封闭的。这一特征是裸子植物的定义特征之一。 裸子植物通常以针状叶和木质结构为特征，使它们能够很好地适应各种环境条件。它们可以在世界的许多地方找到，从寒冷的北方到热带地区。一些常见的裸子植物包括松树、冷杉和雪松。这些植物在其生态系统中发挥着重要作用，为众多物种提供栖息地和食物。 裸子植物最令人着迷的方面之一是它们的繁殖过程。它们通过锥体进行繁殖，锥体包含生殖器官。雄性锥体产生花粉，而雌性锥体则包含在受精后发育成种子的胚珠。这种繁殖方式相当古老，追溯到超过三亿年前，这使得裸子植物成为地球上最古老的活植物之一。 除了生态重要性外，裸子植物还具有相当大的经济价值。许多物种被采伐用于木材，木材用于建筑和家具制作。某些裸子植物（如松树）产生的树脂也对生产松节油和松香等产品非常有价值。此外，一些裸子植物还产生可食用的种子，如松子，这在各种美食中是一种受欢迎的原料。 尽管它们很重要，但裸子植物今天面临着几种威胁。栖息地破坏、气候变化和入侵物种只是影响其种群的一些挑战。保护工作对于保护这些古老植物至关重要，并确保它们在未来世代中的生存。让公众了解裸子植物的重要性可以帮助培养对生物多样性和可持续实践的更大欣赏。 总之，裸子植物是一类独特的植物，具有独特的特征和在我们生态系统中至关重要的角色。它们的韧性和适应能力使它们能够在数百万年中蓬勃发展，但它们需要我们的关注和保护，以便在现代挑战面前继续繁荣。理解和欣赏裸子植物不仅丰富了我们对植物生命的知识，也突显了我们星球上所有生物之间的相互联系。通过研究和保护这些古老植物，我们为我们环境的整体健康和多样性做出了贡献。