Explain how humans are dependent upon the process of photosynthesis.

Mark scheme

Marking points from the official mark scheme (May/June 2014). The mark or mark type is shown in brackets.

1. [6] animals cannot manufacture own food/not producers/AW ;
2. (photosynthesis) converts light energy into chemical energy ;
3. (in the form of) carbohydrate (A named carbohydrate) ;
4. correct ref. to another dietary component ;
5. ref. carbon cycle/carbon in CO2 made available to humans ;
6. (humans) eat food/AW;
7. digested;
8. assimilated/built up to form other chemicals (in humans);
9. provides energy (to humans);
10. ref. human respiration;
11. requires O2 + from photosynthesis ;
12. CO2 used in photosynthesis + removal from atmosphere ;
13. ref. farming + livelihood/profit/commercial use of plant products;
14. [4] magnesium: yellow + leaves/stunted growth ;
15. chlorophyll production ;
16. nitrate: EITHER stunted growth ;
17. protein synthesis*;
18. OR yellow + leaves ;
19. chlorophyll production*;