Which is why plant stems and leaves look green.

因此植物的茎叶都是绿色的。

Hay comes from the stems and leaves of plants such as wheat.

干草来自小麦等植株的茎和叶。

Like hearts and brains for us and stems and leaves for plants, organelles each have a unique job to do.

就像我们的心脏和大脑以及植物的茎和叶一样，每个细胞器都有自己独特的功能。

Though plants lack brains, the firing of electrical signals in their stems and leaves nonetheless triggered responses that hinted at consciousness, researchers previously reported.

研究人员此前曾报告称，尽管植物没有大脑，但它们的茎和叶所发出的电信号能融发反应，这些反应能暗示意识的存在。

But, they were the first plants to form true roots, stems, and leaves that contain vascular tissue, so they're considered the first vascular plants.

但是，它们是第一批形成真正的根、茎和含有维管组织的叶子的植物，所以它们被认为是第一批维管植物。

That’s why plant stems and leaves look green.

这就是为什么植物的茎和叶看起来是绿色的。

You'll know they're ready after the stems and leaves above the ground wither and turn completely brown.

在地上的茎和叶枯萎并完全变成棕色后，你就会知道它们已经准备好了。

Today, some have names like " clubmoss" and " spikemoss, " but don't be fooled by the misnomers — they're not true mosses because they have roots, stems, and leaves.

今天，有些被命名为“杆藓”和“穗藓”，但不要被这些错误的命名所迷惑——它们不是真正的苔藓，因为它们有根、茎和叶。

First, they all start as single-celled zygotes — made from a sperm cell and egg cell combo — that become multicellular embryos: the tiny beginnings of roots, stems, and leaves.

首先，它们都是从单细胞受精卵开始的——由精子细胞和卵细胞组合而成——然后变成多细胞胚胎：根、茎和叶的微小开端。

Their epidermis, or outermost layer of tissue, produces billions of tiny hairs that absorb water and nutrients, and their vascular tissue transports the nutrients up to the stem and leaves.

它们的表皮，或最外层的组织，产生了数十亿根微小的毛发，这些毛发吸收水分和营养，它们的维管组织将营养物质运送到茎和叶。

At the point where each leaf meets the stem, there's a bud, which is a new meristem that has the potential to grow into a branch and start producing its own stem and leaves.

在每一片叶子与茎相遇的地方，就会有一个芽，这是一个新的分生组织，它有可能成长为一个分支，并开始产生自己的茎和叶。

If you keep it in water, the new tubers won't get big enough to eat, but the stems and leaves on top will keep growing, and you might even see some flowers!

如果你把它放在水里， 新的块茎长得不够大，不能吃，但上面的茎和叶会继续生长， 你甚至可能会看到一些花！