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What do plants do when they are thirsty?
What do plants do when they are thirsty?
admin
2010-01-15
39
问题
What do plants do when they are thirsty?
We all scream for water when thirsty. (15[A]) But do you know in very hot, dry weather plants also make faint sounds— as if they’re crying out for help?
You see, in a plant’s stem there’re hundreds of "water pipes" that bring water and minerals from the soil all the way up to the leaves. As the ground turns dry, it becomes harder and harder for the plants to do this.
In severe droughts, plants have to fight to pull out any water available. Scientist Robert Winter has found out that when it is really bad their water pipes snap from the tension like rubber bands. When that happens, the whole plant vibrates a little. The snapping pipes make noises 10,000 times quieter than a whisper.
Robert knows that healthy, well-watered plants are quiet. (16[D]) He also knows that many insects prefer attacking dry plants rather than healthy plants. How do the insects know which are healthy plants and which are not? Robert thinks that the insects may listen for the plants that cry. And then they may buzz in to kill.
To test his theory, Robert is using a device that can imitate plant cries. He attaches it to a quiet, healthy plant so the plant sounds thirsty. Then he watches insects lo see if they attack more often than usual.
If he is right, scientists could use the insects’ ability against them. (17[D]) They could build traps that imitate crying plants. So when the insects buzz in to eat, they won’t buzz out.
选项
A、Quiet plants.
B、Well-watered plants.
C、Healthy plants.
D、Thirsty plants.
答案
D
解析
细节题。文章中说:他也知道,比起健康的植物来,很多昆虫更愿意攻击干枯的植物。选项D 中的thirsty plants 就是指这里的dry plants,因此本题要选这一项。
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0
专业英语四级
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