I. Translate the following words bearing in mind the meaning of the affixes and memorize them:

1. to estimate (v), estimation (n), estimate (n)

2. to provide (v), provider (n)

3. care (n), careful (adj), careless (adj), carefully (adv) .

4. to depend (v), dependent (n), independence (n), dependent (adj)

5. to describe (y), description (n), de$criptive (adj)

6. to classify (v), class (n); classification (n)

7. power (n), powerful (adj), powerless (adj)

8. beauty (n), to beautify (v), beautiful (adj)

I. Read the following words and guess their meaning:

Number, medicine, classification , sort , tiger, group, leopard, structure, actively, moluska, effect, matter, detail, utilize, foundation, million, microorganism, type, cultural, contribution.

II. Supply the nouns corresponding to the following verbs:

to construct, to engage, to develop, to include, to estimate, to differ, to resemble, to provide, to know, to divide, to derive, to depend, to discover, to vary, to acquaint, to define, to value, to specialize, to describe, to classify, to act.

III. Translate the following word-combinations into Russian and use them in the sentences of your own: to do one's best, to be certain, in spite of, to keep, track, in common, no matter, in turn, according to, in this way, to take care, to be of great value, to keep healthy, to make a contribution, of the same sense.

IV. Give another word or phrase of similar meaning to the following:

Substance, to be similar to, to study, to consider, to construct, discovery, important, resemble, minute, earth, century

V. Answer the questions:

1. How many different kinds of animals and plants exist in the world?

2. Why the classification of living things necessary?

3. How are living things sorted into groups?

4. What ^re the differences between animal and plant kfngdoms?

5. How do men use plants and animals?

VI. Translate into English:

Ученые утверждают, что существует более миллиона различных видов растений и животных. Растения и животные сильно отличаются друг от друга размерами, видом, цветом и т. д. Эти различия хорошо видны, если сравнивать растения, травы, деревья, цветы или различных насекомых, птиц, рыб, людей. Несмотря на все различия, живые организмы имеют много общего. Как растения, так и животные зависят друг от друга в поддержании жизненных функций.

IX. Read the following passages, without a dictionary and reproduce them in Russian to your classmates. Work in pairs:

a) Visitors to Khosta, 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 metres 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 a half mile. The only light in all this vast darkness is made by'animals themselves. Certain squid which are cousins of octopuses, swim in schools and keep together by means of coded flashing

lights. Many kinds of deepsea fish have lights on their bodies. It is believed that thi^ 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.