3(a)(i)Easy1 mark
Potatoes are good sources of starch and vitamin C.
State the name of the solution you would use to test a food sample for vitamin C.
May/June 2026 Paper 61
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3(a)(ii)Easy1 mark
A sample of potato can be tested to show that it contains starch by adding iodine solution.
State the expected result of a positive test.
3(b)(i)Easy2 marks
Scientists investigated the effect of the mass of fertiliser used on potato crop yield.
The scientists planted seed potatoes in six different fields.
They planted the same variety of seed potato in each field, and the same number of seed potatoes were planted per .
At the end of the growing period, the yields of the potato crop harvested in each field were measured.
State two variables the scientists kept constant in this investigation.
Two answers required.
3(b)(ii)Medium4 marks
The results of the investigation are shown in Table 3.1.
| mass of fertiliser used / kg per hectare | potato crop yield / tonnes per hectare |
|---|---|
| 60 | 32.5 |
| 115 | 40.0 |
| 170 | 43.5 |
| 230 | 45.0 |
| 285 | 44.5 |
| 340 | 44.0 |
Plot a line graph on the grid of the data in Table 3.1.
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3(b)(iii)Easy1 mark
Describe the effect on the potato crop yield of increasing the mass of fertiliser used.
Your answer
3(b)(iv)Medium2 marks
Use your graph to estimate the potato crop yield when 90 kg of fertiliser per hectare was used.
Show on the graph how you obtained your estimate.
Your answer
3(b)(v)Medium3 marks
Using the data in Table 3.1, calculate the percentage change in the potato crop yield when the mass of fertiliser used was increased from 60 kg per hectare to 285 kg per hectare.
Give your answer to three significant figures.
Answer
3(c)Easy1 mark
Fertilisers contain nitrates which are used by plants to make proteins.
State the name of the solution used to test for protein.