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21英语教师网 > 备课资源 > 拓展阅读 > 正文
Colored plants can help health
作者:21ST    来源:21英语网    日期: 2012-09-17

人教版高三年级:Exploring plants

关键词:Nature: plants; History of plant exploration

话题归类:自然Nature 

 

你知道吗,水果蔬菜的鲜艳色彩对我们的身体也是有好处的。


词数 253 建议阅读时间 4分钟

PLANTS and animals often use color to draw attention. But did you know that deep, rich colors also help protect plants from chemical damage?

The things responsible for a plant's color are known as antioxidants (抗氧化剂). Plants make antioxidants to protect themselves from the sun's ultraviolet (UV) light (紫外线).

Ultraviolet light causes bad chemicals to form within plant cells. If those chemicals move through plant cells without being changed or destroyed, they can begin to damage the cells. Antioxidants stop the bad chemicals in their tracks (路径) and protect cells from harm (伤害).

Typically, a dark-colored plant has more of these antioxidants than a paler one.

These bad chemicals aren't just a problem for plants. They also do harm to people and animals. Ultraviolet light isn't the only source of these chemicals.


Sunscreen on the inside


If you breathe polluted air, you take in chemicals that also cause similar damage. Even your body produces these bad chemicals when it processes food.

Our bodies have natural defenses (防御) for fighting off these chemicals. While we're young, our defenses are pretty strong. However, our natural defenses get weaker as we get older. The body's built-in stoppers can only go so far without extra help.

The good news is that eating colorful fruits and vegetables helps us get antioxidants. It is like putting sunscreen on the inside of our body.

So from now on, put as much blueberries, grapes, and eggplants on your menu as you can.

 



关键词:人教版 高三 Exploring plants 自然Nature



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