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I. Lexics to the text:
1. to consider – считать, рассматривать
2. to hesitate – колебаться, сомневаться
3. the making of starch – образование крахмала
4. build them into starch and sugar – преобразовывать их в крахмал и сахар
5. ivy – плющ
6. vine – like plant – ползучее растение
7. try an experiment – проделать эксперимент
8. to fill a tube – наполнить пробирку
9. using your thumb – при помощи большого пальца
10. upside down – вверх дном
11. a bowl of water – чаша с водой
12. the mouth of the tube – отверстие пробки
13. to take the thumb away – убрать палец
14. to push smth. inside the tube – поместить что-то в пробирку
15. to set smth. in the sun – поставить на солнце
16. a vacant space – свободное пространство
17. oxygen - кислород
18. to be produced – образоваться
II. Read and translate the text:
If you were to ask a chemist what he considered the most important chemical process in the world, he would not hesitate to answer, “The making of starch by plants.”
A green plant is nature’s chemical laboratory. It is able to take carbon dioxide from the air and water from the soil and build them into starch and sugar; the process is made possible by the action of sunlight on the green colouring material of the plant.
Ii you have a growing plant in your home, preferably ivy or some vine-like plant, try this experiment: fill a test tube to the very top with water and using your thumb as a stopper, turn the tube upside down in a bowl of water. Now, being very careful to keep the mouth of the tube under water, take your thumb away and push a branch of the plant up inside the tube, then set the whole arrangement in the sun.
In a few hours you will find what seems to be a vacant space at the top of the tube. This space is really filled with oxygen which was produced by sunlight acting on the leaves of the plant.
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III. Answer the questions on the text:
1. The making of starch by plants is the most important chemical process in the world, isn’t it?
2. What does a green plant take from the air and from the soil?
3. How does a green plant build carbon dioxide and water info starch and sugar?
4. Prove it experimentally. (Describe the experiment).
Дата публикования: 2014-11-29; Прочитано: 256 | Нарушение авторского права страницы | Мы поможем в написании вашей работы!