Food Production

4. Type of control of pests where a natural predator is introduced
7. Name for anaerobic respiration in microorganisms
10. No unwanted microorganisms present
12. Caused when fertilisers leach from soil into waterways
14. This increases crop yield by providing minerals e.g. nitrate or magnesium
18. Industrial versions of these grow useful microbes on a large scale
19. Type of respiration used in bread and yoghurt making
20. Plants need to absorb nitrates from the soil to make this substance

1. Technique used to keep conditions sterile in fermenters
2. Chemical which kills weed plants that compete with crops
3. The measurable amount of food or biomass made when growing a crop plant
5. Transparent building made of glass to grow plants inside
6. The energy source for photosynthesis
8. The leaves of plants that cannot gain enough magnesium ions look like this
9. This type of competition is reduced in fish farms by keeping different ages of fish in separate pens
11. A layer of this over a suspension of yeast will keep conditions anaerobic
13. This needs to be optimum for enzymes to function at their best
15. Type of bacterium needed to make yoghurt
16. Used to make bread
17. These kill animals that eat crop plants