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The development of xylem is of mesarch.Stomata are monocyclic type.

柄、上胚轴维管束均为外型。

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Actinostele A rype of protostele in which the xylem is star shaped and the phloem lies between the points of the star.

生中柱一种类型。木质部是星皮部位于星之间。

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Tree rings are made of tissue called xylem.

构成年轮的组织被称为木质部。

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双语版 TED-Ed 演讲

This capillary motion is in full effect in xylem filaments thinner than human hair.

木质纤维中毛细作用无处不,这些木质纤维比人的头发还细。

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双语版 TED-Ed 演讲

Right beside the phloem is the tree's other tissue type: the xylem.

韧皮的旁边是树的另外一种组织叫木质。

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双语版 TED-Ed 演讲

This evaporation, called transpiration, creates negative pressure in the xylem, pulling watery xylem sap up the tree.

这种蒸发,叫作蒸腾作用,木质中产生一种负压,把液体的木质树液往树方拉。

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基础入门

Through that space stretches the vascular bundle, with xylem to transport water and phloem which transport sugars after photosynthesis.

通过这个空间,延伸出维管束,木质部负责运输水,韧皮部负责光合作用后运输糖。

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TED Radio Hour

So these are xylem sap feeders.

所以这些是木质部汁液饲养者。

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TED Radio Hour

And xylem is just 95% water.

木质部只有 95% 是水。

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Crash Course 植

And there are two main types of cells that make up that vascular tissue: xylem and phloem.

构成维管组织的细胞主要有两种:木质部和韧皮部。

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Crash Course 植

Phloem cells, on the other hand, transport stuff mostly in the opposite direction as xylem cells.

另一方面,韧皮部细胞与木质部细胞的运输方向相反。

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双语版 TED-Ed 演讲

To accomplish this herculean task, the xylem relies on three forces: transpiration, capillary action, and root pressure.

要完成这样艰巨的任务,木质要依赖于三种力量:蒸腾作用,毛细作用和根压。

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Crash Course 植

And if we zoom in, we'll notice its xylem and phloem cells snuggled together, just like they were in the stem.

如果我们放大,我们会注意到它的木质部和韧皮部细胞依偎一起,就像它们茎中一样。

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TED-Ed(视频版)

Right beside the phloem is the tree’s other tissue type: the xylem.

韧皮部旁边是树的另一种组织类型:木质部。

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PBS地球-动趣闻

And pro-tip, xylem is one of my favorite scrabble words.

专业提示,木质部是我最喜欢的拼字游戏之一。

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Crash Course 植

Sclerenchyma supports organs that are fully mature, and similar to xylem, it has cells that are dead inside (physically, not emotionally) .

厚壁组织支持完全成熟的器官,与木质部相似,它有从内部死亡的细胞(我指的是身体,而不是情感)。

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TED演讲(视频版)双语

Carbon and water, more than 1,000 liters of water, in fact, flow freely through the phloem and xylem tubes carry it along.

碳和水,实际超过 1000 升的水,自由流动于韧皮部和木质部的管道中。

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Crash Course 植

As the plant grows, stem cell clusters called meristems generate new xylem cells, which form bigger pipes to suit the plant's needs.

随着植的生长,被称为分生组织的干细胞簇产生新的木质部细胞,这些细胞形成更大的管道以适应植的需要。

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Crash Course 植

After water flows from the roots to the leaves through the xylem, it can exit the plant through the tiny stomata mouths.

水通过木质部从根流向叶后,再通过细小的气孔口排出植株。

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双语版 TED-Ed 演讲

This process, called osmotic movement, creates nutrient-rich xylem sap, which will then travel up the trunk to spread those nutrients through the tree.

这个过程,叫做渗透运动,会产生营养丰富的木质树液,这些树液会沿着树干向把营养传送到整棵树。

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2023-37

That causes air bubbles to form in the xylem, a specialised tissue that transports water from a plant's roots to its leaves.

这会导致木质部中形成气泡,木质部是一种将水从植根部输送到叶子的特殊组织。

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双语版 TED-Ed 演讲

And where these two forces pull the sap, the osmotic movement at the tree's base creates root pressure, pushing fresh xylem sap up the trunk.

这两种力量推动树液向,树根部的渗透作用也产生树压,把新鲜的木质树液推树干。

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