dicotyledons

简明释义

英[ˌdaɪkəʊˈtɪlɪdənz]美[ˌdaɪkəˈtɪlədənz]

n. [植]双子叶植物（dicotyledon 的复数）

英英释义

单词用法

同义词

反义词

例句

1.All trees except palms are dicotyledons.

除了棕榈树，所有的树都是双子叶植物。

2.Until now, 83 sucrose transporter genes have been cloned in 31 dicotyledons and 6 monocotyledons.

目前已从31种双子叶植物和6种单子叶植物中克隆到83个蔗糖转运蛋白基因。

3.The dicotyledons diverged at an early stage of their evolution into two main groups.

双子叶植物在演化的早期阶段就已分化为两大支派。

4.Monocotyledons and dicotyledons are so termed because they normally conatin one and two cotyledons respectively although there are exceptions.

尽管有例外的情况出现，我们通常还是根据子叶的数目为一片还是两片而把植物分成单子叶植物和双子叶植物。

5.The host plants of this insect include 389 species (varieties) in 109 families, and are composed of ferns plants, gymnospermae, dicotyledons and monocot crops.

该虫寄主涉及到蕨类植物、裸子植物、双子叶植物、单子叶植物，共计109科389种(包括变种)。

6.A typical foliage leaf of a plant belonging to the dicotyledons is composed of two principal parts: blade and petiole.

双子叶植物典型的营养叶由两个主要部分组成：叶片和叶柄。

7.The host plants of this insect include 389 species (varieties) in 109 families, and are composed of ferns plants, gymnospermae, dicotyledons and monocot crops.

该虫寄主涉及到蕨类植物、裸子植物、双子叶植物、单子叶植物，共计109科389种(包括变种)。

8.The dicotyledons 双子叶植物 group includes many important agricultural crops.

dicotyledons 双子叶植物 组包括许多重要的农作物。

9.In botany classes, students learn to identify dicotyledons 双子叶植物 by their leaf patterns.

在植物学课程中，学生们学习通过叶片形状识别dicotyledons 双子叶植物。

10.Many garden plants, such as roses and sunflowers, are classified as dicotyledons 双子叶植物.

许多花园植物，如玫瑰和向日葵，被归类为dicotyledons 双子叶植物。

11.Some common examples of dicotyledons 双子叶植物 are beans and peas.

一些常见的dicotyledons 双子叶植物 是豆类和豌豆。

12.In a study of plant evolution, researchers found that dicotyledons 双子叶植物 have unique genetic traits.

在对植物进化的研究中，研究人员发现dicotyledons 双子叶植物具有独特的遗传特征。

作文

In the world of botany, understanding plant classifications is crucial for both scientists and enthusiasts alike. One of the primary groups of flowering plants is known as dicotyledons, which are commonly referred to as dicots. These plants are characterized by having two embryonic leaves, or cotyledons, which emerge during the seedling stage. This feature sets them apart from their counterparts, the monocotyledons, or monocots, which only have one cotyledon. The distinction between these two groups is fundamental in the study of plant biology and ecology.The term dicotyledons originates from the Greek words 'di,' meaning two, and 'cotyledon,' referring to the seed leaf. This classification encompasses a wide variety of plants, including many trees, shrubs, and flowering plants. Some well-known examples of dicotyledons include roses, sunflowers, and oak trees. Each of these plants exhibits unique characteristics that can be traced back to their classification as dicots.One of the defining features of dicotyledons is their leaf structure. Typically, the leaves of dicots are broad and have a network of veins that form a branching pattern. This contrasts with monocots, which usually have long, narrow leaves with parallel veins. The vein arrangement in dicots allows for greater surface area, which can enhance photosynthesis and contribute to the plant's overall growth and health.Another important aspect of dicotyledons is their flower structure. Most dicots tend to have flowers with petals in multiples of four or five, whereas monocots often have flower parts in multiples of three. This floral arrangement plays a significant role in the reproductive strategies of these plants, influencing pollination and the subsequent development of seeds.In addition to their physical characteristics, dicotyledons also exhibit a variety of growth forms. They can be herbaceous, meaning they have soft stems, or woody, which means they develop hard, lignified stems. This diversity allows dicots to thrive in various environments, from tropical rainforests to arid deserts. For instance, cacti are a type of dicot that has adapted to survive in harsh conditions by developing thick, fleshy stems that store water.The ecological importance of dicotyledons cannot be overstated. They play vital roles in ecosystems as producers, providing food and habitat for countless species. Furthermore, many dicots are essential for human agriculture, yielding crops such as beans, tomatoes, and potatoes. Understanding the biology of dicotyledons helps farmers and agricultural scientists improve crop yields and develop sustainable farming practices.In conclusion, the study of dicotyledons offers valuable insights into plant biology and ecology. Their unique characteristics, such as leaf structure and flower arrangement, distinguish them from other plant groups. As we continue to explore the diverse world of plants, recognizing the significance of dicotyledons will enhance our appreciation for the natural world and its intricate systems. Whether you are a botanist, a gardener, or simply a nature lover, understanding dicotyledons opens up a whole new realm of knowledge about the plants that share our planet.

在植物学的世界中，了解植物分类对科学家和爱好者来说至关重要。开花植物的主要类别之一被称为双子叶植物，通常被称为双子叶植物。这些植物的特点是具有两个胚芽叶或子叶，这些叶子在幼苗阶段出现。这一特征使它们与其对应物单子叶植物（或单子叶植物）区分开来，后者只有一个子叶。这两组之间的区别在植物生物学和生态学的研究中是基础性的。术语双子叶植物源自希腊词“di”，意为二，“cotyledon”指种子叶。这一分类包括各种植物，包括许多树木、灌木和开花植物。一些著名的双子叶植物实例包括玫瑰、向日葵和橡树。这些植物的每个特征都可以追溯到它们作为双子叶植物的分类。双子叶植物的一个定义特征是它们的叶子结构。通常，双子叶植物的叶子宽大，并且具有形成分支模式的脉络。这与单子叶植物形成对比，后者通常具有长而窄的叶子，脉络平行。双子叶植物中脉络的排列允许更大的表面积，这可以增强光合作用并有助于植物的整体生长和健康。双子叶植物的另一个重要方面是它们的花结构。大多数双子叶植物的花瓣通常以四或五的倍数出现，而单子叶植物的花部件往往以三的倍数出现。这种花的排列在这些植物的繁殖策略中起着重要作用，影响授粉和随后的种子发育。除了它们的物理特征外，双子叶植物还表现出多种生长形式。它们可以是草本植物，意味着它们有柔软的茎，或者是木本植物，意味着它们发展出坚硬的木质茎。这种多样性使双子叶植物能够在各种环境中生存，从热带雨林到干旱沙漠。例如，仙人掌是一种适应艰苦条件的双子叶植物，通过发展厚而肉质的茎来储存水分。双子叶植物的生态重要性不可低估。作为生产者，它们在生态系统中扮演着至关重要的角色，为无数物种提供食物和栖息地。此外，许多双子叶植物对人类农业至关重要，产生如豆类、西红柿和土豆等作物。了解双子叶植物的生物学有助于农民和农业科学家提高作物产量并发展可持续的农业实践。总之，研究双子叶植物为植物生物学和生态学提供了宝贵的见解。它们独特的特征，如叶子结构和花的排列，使它们与其他植物群体区分开来。随着我们继续探索多样化的植物世界，认识到双子叶植物的重要性将增强我们对自然世界及其复杂系统的欣赏。无论你是植物学家、园丁还是单纯的自然爱好者，理解双子叶植物将为你打开一个全新的知识领域，关于与我们星球共享的植物。