food production

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Across
  1. 2. make nucleotides which are used to make DNA
  2. 4. a factor affecting the rate of photosynthesis measured in degrees celsius
  3. 7. helps make amino acids for growth
  4. 9. pesticide used to kill insects
  5. 13. places to grow fish to be sold
  6. 17. chemicals used to increase crop yield
  7. 18. reactant needed for photosynthesis
  8. 20. using specific fish with desired characteristics to reproduce
  9. 21. using natural predators to kill unwanted organisms
Down
  1. 1. chemical control of unwanted organisms
  2. 3. medicine used to prevent disease
  3. 5. process plants use to make energy
  4. 6. pesticide used to kill fungus
  5. 8. build up of poisons along a food chain
  6. 10. predation between different species
  7. 11. makes chlorophyll
  8. 12. nutrients needed to grow plants e.g. nitrates
  9. 14. the pesticide used to kill weeds
  10. 15. the amount of crop that is produced
  11. 16. predation within the same species
  12. 19. fertiliser natural organisms used to increase crop yield