Across
- 3. What are given to fish to prevent disease
- 8. Living organisms to control pests
- 10. Increases rate of photosynthesis until limited by another factor
- 11. Needed to make nucleotides for DNA
- 13. A chemical used to kill insects or crops which damage plants
- 14. A substance spread on soil to help crops grow bigger and faster
- 17. When bacteria are no longer killed by antibiotics
- 18. Gradual build of chemical substances in an organism over its lifespan
- 19. Transports sucrose and amino acids in plants
- 20. Pesticide for weeds
Down
- 1. Increases rate of photosynthesis until enzymes denature
- 2. Toxic substances become more concentrated in tissues moving up the food chain
- 4. Can be controlled by adding lime to it
- 5. Can be done to ensure high quality, fast-growing fish
- 6. Needed to make amino acids
- 7. What is lost at each trophies level of the food chain
- 9. Catching fish faster than they can reproduce and grow
- 12. What can be controlled in fish farming to reduce pollutants in flesh of the fish
- 15. Transports water and mineral ions in plants
- 16. Used to make chlorophyll