1. Food production is increased by farming.

2. If fertiliser leaches from fields and enters an aquatic system, an algal results.

3. Which of the following pesticides would be used to kill weeds?

    insecticide

    fungicide

    herbicide

    bactericide

4. What word is used to describe the build up of a substance, such as DDT, along a food chain?

5. Lichens are very good species because their presence or absence gives us a clue about pollution levels.

6. What do we call the addition of a substance to the environment which might be harmful to organisms?

7. Which of the following chemicals would you not expect to find in fertilisers?

    nitrogen

    magnesium

    carbon

    phosphorous

8. Which of the following would indicate unpolluted water?

    water louse

    rat tailed maggot

    caddis fly larvae

    bloodworm

9. We call the introduction of a predator species into an environment, control.

10. Crusty lichens indicate a low level of sulphur dioxide in the air.

    True

    False