1. B4 e-h Pig

2. What’s wrong with this food chain?

3. Arrows pointing wrong way

4. How do you work out biomass?

5. Number of organisms x average (dry) mass

6. List 2 ways energy is lost as you move up a food chain

7. Some parts don’t get eaten
Some lost as faeces
Some used in respiration (movement, keeping warm etc)

8. Why can farmers make more money by keeping battery hens in cages than they can from free range?

9. Less energy is lost in moving and keeping warm so farmers can feed them less

10. Name 2 biofuels

11. Biogas (methane)
Bioethanol
Wood

12. How do you make biogas?

13. Fermentation
By bacteria
In a digester

14. Why do farmers use pesticides?

15. So pests don’t eat crops
(Less of the crop’s energy is lost to pests is a better answer)

16. What is biological control?

17. A natural predator eats the pest

18. What are the advantages of biological control?

19. No toxic chemical
Useful insects not harmed
Top predators not poisoned

20. What 3 conditions do decomposers need to grow?

21. Oxygen
Water
Warmth

22. Why does adding sugar or salt preserve food?

23. Removes water using osmosis

24. Name 2 uses of decomposing microbes?

25. Making compost
Breaking down sewage

26. How does carbon get into plants?

27. Photosynthesis

28. List 3 ways carbon is put back into the atmosphere?

29. Respiration by animals
Respiration by plants
Respiration by decomposers (decomposition)
Combustion

30. Why is there more carbon dioxide in the atmosphere in the winter?

31. Less photosynthesis (fewer leaves)
More combustion (heating)

32. What other element is recycled in nature?

33. nitrogen