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Essential English for Biology Students.doc
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VI. Give Russian equivalents to the following English terms:

English term

Russian equivalent

1

the rate of photosynthesis

2

produced per unit time

3

compensation point

4

light intensity

5

concentration of photosynthetic pigments

6

a heavy isotope of oxygen

7

sun plants and shade plants

8

to be sensitive to temperature

9

to be driven by light

10

to be similar to

11

have little effect on the reactions

12

under natural conditions

VII. Find synonyms among the pool of words:

Pool of words

Synonyms

1)1.external/2.limit/3.outer/4.internal/5.inner/6.end-point

2)1.rate/2.measure/3.degree/4.level/5.proportion/6.position

3)1.factor /2.strength /3.component /4.intensity

4)1.improvement /2.isolated /3.separated /4.development

VIII. Answer the following questions. Use all information given before:

1. How can the rate of photosynthesis be measured?

2. What is the compensation point?

3. What is the compensation point related to?

4. Is photosynthesis affected by external and internal factors?

5. What do external factors include?

6. What do internal factors include?

7. What is the effect of light intensity, carbon dioxide level, temperature on the rate of photosynthesis?

8. What does the law of limiting factors state?

IX. Match the sentence halves. Make complete sentences:

1.

The rate of photosynthesis can be measured as

A.

lght intensity, the wavelength of light, carbon dioxide levels, temperature, wind velocity, and water and mineral supplies.

2.

The compensation point is usually related to

B.

to light intensity.

3.

Photosynthesis is affected by many factors,

C.

tpe and concentration of photosynthetic pigments, enzyme and water content, and leaf structure, and position.

4.

External factors include

D.

its rate at any given moment is limited by the factor at its least favourable value and by that factor alone.

5.

Internal factors include

E.

both external (in the environmental) and internal (inside the plant).

6.

The rate of photosynthesis is directly proportional

F.

because these are driven by light, not heat.

7.

Changes in temperature have little effect on the reactions of the light-dependent stage

G.

the volume of carbon dioxide taken in by a part per init time, or as the amount of carbohydrate produced per unit time.

8.

When a physiological process depends on more than one essential factor being favourable,

H.

a particular light intensity or carbon dioxide level.

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