18 triple

2. The movement of energy from one organism to another when eaten (6, 8)
3. A simple diagram showing the transfer of energy between organisms (4, 5)
5. A factor that can reduce food security by affecting crop growth (7, 6)
9. Undigested food that passes out of animals, reducing biomass transfer
11. A method of farming that uses technology and chemicals to increase productivity (9, 7)
12. A process that causes loss of biomass and energy in organisms
15. Legal limits on the amount of fish that can be caught (7, 6)
16. An animal that eats producers (7, 8)
17. Having enough food to feed the population (4, 8)
18. The amount of useful product or crop produced
20. A method of growing plants in nutrient-rich water without soil

1. Altering the DNA of an organism to improve characteristics (7, 11)
4. The position of an organism in a food chain (7, 5)
6. A protein-rich food made using fungi
7. A diagram that shows the amount of living material at each trophic level (7, 2, 7)
8. A large vessel used in biotechnology to grow microorganisms
9. A severe shortage of food
10. Using methods that protect resources and the environment long term (11, 7)
13. The mass of living material in an organism
14. An organism that makes its own food, usually through photosynthesis
19. An organism that breaks down dead material and returns nutrients to the soil