Across
- 1. natural enemies of pests
- 3. advantage of slash and burn technique
- 5. turns litmus paper and universal indicator red
- 8. when the water turns green due to chemical fertilisers
- 10. process of green plants making food
- 12. herbicides kill ..
Down
- 2. green pigment needed to trap light
- 4. used to kill pests
- 5. pH 8-14
- 6. nutrients added to soil to help plants grow faster and bigger
- 7. smoke from fire can cause this (unhealthy PSI)
- 9. gas given out during the process of making food
- 11. neutral solution turns universal indicator this colour