Across
- 3. An example of a fish farmed in freshwater tanks
- 4. Chemicals used to kill pests
- 6. Fish are fed these, the composition of which can be carefully controlled
- 7. Cages offer fish protection from ___________ predators
- 10. This gas is essential for photosynthesis, and the levels of it can also be artificially increased (6,7)
- 12. Artificial ________ increases the time when photosynthesis can occur
- 13. Artificial (or natural) substance added to the soil to give plants nutrients
- 14. Uses other organisms to feed on pests (10, 7)
Down
- 1. Fish of a similar size are kept together to avoid __________ predation
- 2. Glasshouses keep plants free from pests and ____________
- 5. This is maintained/ increased in greenhouses due to the 'greenhouse effect' and the combustion of fuels in the winter
- 8. Glasshouses increase the rate of ___________ in a plant
- 9. The amount of crop harvested in a given area
- 11. An example of a fish farmed in Scottish sea lochs