(ii) any two from: carbon dioxide (concentration) • temperature / heat • (amount of) chlorophyll / chloroplasts • water ions / nutrients ignore ref to surface area of the leaf 2 [8] M6. (a) photosynthesis do not accept other additional processes 1 (b) (i) any three from, eg: ignore time / apparatus mass of pondweed • 2 type of pondweed = max accept amount / volume / length / size ignore number / surface area of leaves / pondweed unqualified volume of • accept amount other reasonable features of the water • intensity • accept distance between light source and tube / pondweed light colour • accept light if neither colour nor intensity is given carbon dioxide • temperature • pH • 3
(ii) any two from: • carbon dioxide (concentration) • temperature / heat • (amount of) chlorophyll / chloroplasts water ions / nutrients ignore ref to surface area of the leaf 2 [8] M6. (a) photosynthesis do not accept other additional processes 1 (b) (i) any three from, eg: ignore time / apparatus • mass of pondweed type of pondweed = max 2 accept amount / volume / length / size ignore number / surface area of leaves / pondweed unqualified • volume of accept amount • other reasonable features of the water • intensity accept distance between light source and tube / pondweed • light colour accept light if neither colour nor intensity is given • carbon dioxide • temperature • pH 3
b8_photosynthesis_mark_scheme.docx