The cell. Кулагина Ж.Д. - 42 стр.

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      Ex. 6. Put the verbs in brackets into a proper tense form.

1. The basic difference between plants and animals (lie) in the structure and
function of the cell. 2. Certain plants and animals (cause) diseases. 3. Our lives
(depend) on how we (learn) the living around us. 4. Certain vital processes
(take) place in plant bodies in the same manner as in animal bodies. 5. Both
plant and animal life (change) constantly. 6. Plants (respond) to external stimuli.
7. Plants (lack) nervous system and specific sense organs. 8. Both plants and
animals (have) hormones. 9. The use of plant hormones and plant regulators in
agriculture (become) very important.

      Ex. 7. Use the Active in the sentences below.

1. Biology is commonly divided into zoology and botany. 2. In animals this
coordination and response to stimuli are accomplished by sense organs and the
endocrine and nervous systems. 3. In animals the response to stimuli is regulated
by the endocrine system. 4. In plants certain chemical coordination is caused by
external stimuli. 5. In animals hormones are produced by specific glands. 6.
Plants and animals are called organisms. 7. Biology may also be defined as the
science of organisms.

      Ex.8. Use the Passive in the sentences below

1. Plants make their own food. 2. Biologists study living things. 3. Biologists
study the relations of plants and animals to one another. 4. Biologists learn the
relations of plants and animals with the world around them. 9. Constant changes
of the environment cause changes in the life of plants and animals. 6. Substances
produced inside an organism influence specific physiological processes. 7. Plant
physiologists actively study the ways of using plant hormones and plant
regulators in agriculture.

      Ex. 9. Use Participle constructions in the sentences below.

1. Biology includes all the facts and principles which have been derived from a
scientific study of living things. 2. The special study of animals which is called
Zoology is the second of the two great subdivisions of biology. 3. Substances
are produced in one part of the organism and transported to another part. They
influence specific physiological processes. 4. Other substances which act like
hormones but which are not produced by the plants are called plant regulators. 5.
Plants lack nervous system and specific sense organs. They respond to external
stimuli by certain chemical coordination. 6. Plant regulators are not produced by
the plant. They are synthetic substances. 7. The word science comes from the