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