Biosphere Control and Management Revision Questions

1. This is a revision exercise to see how well you know your work on this section of the course. • You will be presented with a question on the screen. • You have to think of the answer or write the answer down on paper. • Then you must click the mouse button • You will then see the correct answer appear on the screen. • Press the mouse again for the next question to appear. once only Now start the questions.

2. Biosphere (c) Control and Management Revision questions

3. 1. What are the 3 main sources of pollutants? Answer: *Agriculture *Domestic *Industrial

4. 2. From the following pollutants, say whether their source is industy, agriculture or domestic. industry agriculture domestic agriculture

5. For each of the pollutants mentioned below, suggest a method of control to reduce that pollutants. 3. International agreements Clean air acts Lead free petrol

6. 4. What are our 2 main ways of producing energy? • Nuclear power • Burning fossil fuels

7. 5. Give 3 disadvantages of using fossil fuels. Soot produced by smoke reduces photosynthesis in plants. CO2 produces global warming SO2 produces acid rain

8. 6. What are some of the disadvantages of using nuclear power? • Dangerous radiation leaks • Used fuel must be stored for thousands of years • Low level radiation in cooling water from power station • Long term effects of storing radioactive materials unknown.

9. 7. Give 3 examples of materials which could be described as organic waste. Raw sewage (untreated) Dead leaves Stale food

10. 8. Name a group of living things that use organic waste as a food source and in so doing bring about the process of decay. Bacteria

11. 9. If a river was polluted by organic waste: In what way does the number of micro-organisms in the river change? The number of micro-organisms would increase What effect does this have on the amount of oxygen available to other organisms in the water? The amount of oxygen available would decrease

12. 10. Under what 2 circumstances might a river become polluted by organic waste? • Sewage works overloaded in a densely populated area • Paper mills discharging untreated organic waste (paper fibres)

13. 11. Why do the numbers of bacteria increase when sewage enters the water? Bacteria feed on organic waste in sewage. They grow and multiply, using up oxygen.

14. 12. What is meant by the term ‘Indicator Species’ ? A species whose presence or absence can be used to tell us something about the environment.

15. 13. The presence of which 2 invertebrates and no others indicates very highly pollutes water? • Rat-tailed maggot • Sludge worm

16. 14. What effect does the amount of sewage have on the number of different species living in a river? The more sewage, the less number of species

17. 15. What has caused the large decline in fish stocks in the North Sea? Over fishing In what way has the EEC tried to prevent further decline in fish stocks? Impose annual fishing quotas

18. 16. Why might the introduction of a foreign species have a disastrous effect on a native ecosystem? Lack of predators can cause an increase in the numbers of the foreign species e.g. rabbits introduced to Australia

19. 17. In Ethiopia why have certain areas of land been poorly managed, resulting in crop failure? • Overgrazing • Poor farming methods

20. 18. How could the management of third world countries be improved? Supply them with modern machinery Train them in the use of the machines Educate them in modern farming methods

21. 19. What are the 3 main things that a farmer must do to his land to produce high yields of crops? • Keep the soil fertile – use fertilisers • Prevent wild plants from competing -use herbicides • Prevent and control disease – use pesticides

22. 20. What could be used by farmers as an alternative to fertilisers? Manure

23. This is the end of the questions on Control and Management. These revision questions will automatically run again. If you want to return to the list of revision topics click on the back browser on your toolbar.