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6. Which of the following is not a disadvantage of Hydroponics?
- Growers need to be skilled and trained
- The plants need supporting
- Mineral levels can be controlled
- It can be expensive to set up and run
7. ______ means using living things instead of chemicals to control a pest
- Biological Control
- Labour Intensive
- Organic Farming
- Pesticides
- Hydroponics
8. Nitrogen is constantly recycled
9. How can water pollution be measured?
- Neither
- Both
- Indirectly
- Directly
10. Lichen Distribution indicates the amount of air pollution