carbon dioxide (concentration) • temperature allow 1 mark for light if colour is not • already awarded. light colour / wavelength • pH • size of pondweed / plant • ignore volume of water unqualified same species / type of pondweed • volume of water in the tube • 4.3 number / amount of bubbles or amount of ignore the bubbles unqualified 1 gas / oxygen (relevant reference to) time / named time allow how long it bubbles for 1 interval do not allow time bubbles start / stop ignore speed / rate of bubbling ignore instruments do not allow other factors e.g. temperature accept how many bubbles per minute for 2 marks 4.4 Light intensity 1 4.5 Temperature/carbon dioxide / CO2 heat 1 allow CO2 do not allow CO2 Qu No. Extra Information Marks 5.1 no oxygen (is used) 1 5.2 muscles become fatigued / stop contracting 1 (because) not enough energy is transferred 1 5.3 carbon dioxide 1 5.4 the bubbles or measure volume of gas 1 in a given time 1 Qu No. Extra Information Marks light is trapped / absorbed / used extra answers cancel mark 1 ignore solar / sunshine by chlorophyll / chloroplasts if no other marks awarded, allow 1 mark 1 6.1 for photosynthesis / equation for photosynthesis 1 (to make) starch (for storage) ignore for growth (unqualified) ignore respiration 1 (to make) fat / oil (for storage) 1 6.2 (to make) amino acids / proteins / enzymes allow for active transport allow any other correct, named organic substances (eg DNA / ATP / chlorophyll / hormone) 1 (to make) cellulose / cell walls
• carbon dioxide (concentration) • temperature • light colour / wavelength • pH • size of pondweed / plant • same species / type of pondweed • volume of water in the tube allow 1 mark for light if colour is not already awarded. ignore volume of water unqualified 4.3 number / amount of bubbles or amount of gas / oxygen (relevant reference to) time / named time interval ignore the bubbles unqualified allow how long it bubbles for do not allow time bubbles start / stop ignore speed / rate of bubbling ignore instruments do not allow other factors e.g. temperature accept how many bubbles per minute for 2 marks 1 1 4.4 Light intensity 1 4.5 Temperature/carbon dioxide / CO2 heat allow CO2 do not allow CO2 1 Qu No. Extra Information Marks 5.1 no oxygen (is used) 1 5.2 muscles become fatigued / stop contracting (because) not enough energy is transferred 1 1 5.3 carbon dioxide 1 5.4 the bubbles or measure volume of gas in a given time 1 1 Qu No. Extra Information Marks 6.1 light is trapped / absorbed / used by chlorophyll / chloroplasts extra answers cancel mark ignore solar / sunshine if no other marks awarded, allow 1 mark for photosynthesis / equation for photosynthesis 1 1 6.2 (to make) starch (for storage) (to make) fat / oil (for storage) (to make) amino acids / proteins / enzymes (to make) cellulose / cell walls ignore for growth (unqualified) ignore respiration allow for active transport allow any other correct, named organic substances (eg DNA / ATP / chlorophyll / hormone) 1 1 1 1
biology_separate_bioenergetics-1.docx