Biology · May / June 2026 · Paper 61 · Question 3
0610
As printed in the paper
Show the answer and mark scheme
3(a)(i)[1]
DCPIP ;
3(a)(ii)[1]
blue–black ;
3(b)(i)[2]
any two from:
(same) variety of (seed) potato ;
(same) number planted in each m2 / (same) planting density ; (same) growing period ;
3(b)(ii)[4]
axes labelled with units ;
suitable linear scale and data occupies at least half the grid in both directions ;
six points plotted accurately ± half a small square ;
suitable line drawn ;
3(b)(iii)[1]
(as the mass of fertiliser increased, the potato yield) increased and then, decreased (slightly) / became constant ;
3(b)(iv)[2]
intercept indicated on the graph at 90 kg ;
answer consistent for intercept at 90 kg ± half a small square on the candidate’s graph ;
3(b)(v)[3]
36.9 (%) ;;;
3(c)[1]
biuret (solution) ;
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