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1. Past and Present - more

Workheet 1: Test your knowledge

Can you answer the following questions?

1) At the moment the world population is ...

a) about 6 billion people.
b) about 6 trillion people.
c) about 60 billion people.
d) about 6000 trillion people

2) All these people need food. Food production depends strongly on the climate. The climate is affected by certain gases in the atmosphere. What do we call the gases which cause a global warming?

a) Oxygen gases
b) Greenhouse gases
c) Propane gas (liquefied petroleum gases)
d) Ethane gases

3) Changes in climate also affect the growth of plants. Which factors are most important for the growth of plants?

a) Wind, rain, clouds.
b) Clouds, heat, wind.
c) Cold, snow, clouds.
d) Water, light, warmth.

4) Why are climate conditions so important for farming, especially in developing countries?

a) There is no agriculture in developing countries.
b) Agriculture can only take place in the mountainous areas in developing countries.
c) Only plants whuch are very sensitive to the climatic conditions can be grown In developing countries.
d) In developing countries there are often no irrigation systems or pest control and physical main factors like soil and climate are poor.

5) Extreme weather can have a direct or indirect influence on plants. Very high temperatures for example directly affect plants as ...

a) evaporation decreases and the plant dies.
b) there is no evaporation and the plant dies.
c) evaporation increases and the plant dies.
d) evaporation does not change and the plant dies.

6) Insects are very sensitive to temperature variations because they are cold blooded. How do most insects react to higher temperatures?

a) They reproduce more slowly.
b) They reproduce faster.
c) The number of insects remains the same.
d) The number of insects diminishes.

7) Why do air currents often cause damage to plants?

a) Because useful insects are taken away.
b) Because air currents bring too much rain.
c) Because rainfall is prevented.
d) Because pathogenic germs and harmful insects are passed on to healthy plants.

8) What was the main reason for the great famine in Ireland (1846-1850)?

a) Late Blight through fungus "Phytophthora infestans“.
b) Mite spider.
c) Potato bug.
d) Lack of rain.

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