• create baseline • create set point • validity IGNORE fair test’ DO NOT CREDIT variable’ / variable’ ‘control ‘controlled 1 (ii) Read as paragraph. Mark the first 2 responses only. DO NOT CREDIT ref to time / same number of leaf discs / same plant (as these given in the question) IGNORE ‘fair test’ without further explanation discs, the same size / cut with same cutter, same surface area; 1 so ALLOW for same amount of pigment / chloroplast 2 discs taken from same part of the leaf / leaves used from the same part of the plant same amount of, pigment / chloroplast; so same distance from light source light intensity is the same; 3 so 4 bulb the same (wattage) each time light intensity is the same; so 5 same thickness of filter intensity is the same; so 6 carry out in darkened room / only 1 light source in room / completely cover tube with filter, only light of desired wavelength enters; so 7 CO2 in excess / AW, CO2 not limiting / enough CO2 for so photosynthesis / enough CO2 for Calvin cycle / enough CO2 for light independent stage; 8 same, volume / concentration / batch, of indicator that so colour changes are comparable; 9 heat, sink / shield, between light source and tube reduce to temperature changes; 10 carry out at, same / constant, temperature temperature as affects enzyme, activity / structure; Enzyme ref must be qualified carry out, repeats / replicates, calculate mean / identify 11 to, anomalies; IGNORE ref to improving reliability IGNORE how anomalies dealt with DO NOT CREDIT preventing anomalies 12 AVP (to include precaution and explanation);; CREDIT any reasonable precaution with a suitable explanation (even if explanation already given) e.g. rinse test tubes with distilled water so starting pH • is the same 2 max (iii) Mark the answer. If the answer is correct and an additional answer is given that is incorrect or contradicts the
• create baseline • create set point • validity IGNORE fair test’ DO NOT CREDIT ‘control variable’ / ‘controlled variable’ 1 (ii) Read as paragraph. Mark the first 2 responses only. DO NOT CREDIT ref to time / same number of leaf discs / same plant (as these given in the question) IGNORE ‘fair test’ without further explanation 1 discs, the same size / cut with same cutter, so same surface area; ALLOW for same amount of pigment / chloroplast 2 discs taken from same part of the leaf / leaves used from the same part of the plant so same amount of, pigment / chloroplast; 3 same distance from light source so light intensity is the same; 4 bulb the same (wattage) each time so light intensity is the same; 5 same thickness of filter so intensity is the same; 6 carry out in darkened room / only 1 light source in room / completely cover tube with filter, so only light of desired wavelength enters; 7 CO2 in excess / AW, so CO2 not limiting / enough CO2 for photosynthesis / enough CO2 for Calvin cycle / enough CO2 for light independent stage; 8 same, volume / concentration / batch, of indicator so that colour changes are comparable; 9 heat, sink / shield, between light source and tube to reduce temperature changes; 10 carry out at, same / constant, temperature as temperature affects enzyme, activity / structure; Enzyme ref must be qualified 11 carry out, repeats / replicates, to, calculate mean / identify anomalies; IGNORE ref to improving reliability IGNORE how anomalies dealt with DO NOT CREDIT preventing anomalies 12 AVP (to include precaution and explanation);; CREDIT any reasonable precaution with a suitable explanation (even if explanation already given) e.g. • rinse test tubes with distilled water so starting pH is the same 2 max (iii) Mark the answer. If the answer is correct and an additional answer is given that is incorrect or contradicts the
unit-4-answers.docx