Look through the text and choose the most suitable heading from the list 1- 5 for each part a-d of the text. There is an extra heading that you do not need to use.

1. Beaming of light.

2. A unique plant.

3. Luminosity of living organisms.

4. Functions of all living organisms.

5. «Musical» plants.

a) Visitors to Costa, a resort on the Black Sea Coast, always go to see the great silver poplar that grows there. Ten people with joined hands can just encircle the tremendous tree, rising sixty-five meters above the ground. The unique plant is at least 160 years old.

b) Deep in the sea it is always dark, for sunlight cannot reach down more than about half a mile. Animals themselves make the only light in all this vast darkness. Certain squid which are cousins of octopuses, swim in schools and keep together by means of coded flashing lights. Many kinds of deep-sea fish have lights on their bodies. It is believed that this beaming of light helps them to recognize their own kind.

c) Scientists know that all living organisms are luminous. But why? Hundreds of guesses were made and thousands of experiments staged. Now Moscow scientists, supervised by Academician N. Semyonov, have established that luminosity of living organisms is their mode of jettisoning excessive energy, of “letting off steam”, so to speak.

Is there any practical use to be had from the discovery? Yes. It was established that the luminosity of the organisms is connected with their general condition. Cells affected by cancer, for example, are less luminous than healthy ones. Thus one more method of discovering the presence of that illness has been found.

d) Plants are sensitive to sound. Indian botanists have proved that by subjecting plants to sound of definite pitch, it is possible to stimulate or hinder their growth. A seven-year experiment showed that rice and tobacco are the most “musical” plants.

You are going to read the text. Check the meaning and pronounciation of the words in the dictionary.

Interest, course, application, expedition, commission, mile, north, system, publish, form, capital, species, taxonomy, reptiles, nomenclature.

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