May/June 2026 Paper 63

2026 · 3 questions · 18 parts · 40 marks

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1(a)(i)1(a)(ii)1(a)(iii)1(a)(iv)1(a)(v)1(a)(vi)1(a)(vii)1(a)(viii)1(b)

–/15 mks

2(a)(i)2(a)(ii)2(b)(i)2(b)(ii)

–/14 mks

3(a)(i)3(a)(ii)3(a)(iii)3(b)(i)3(b)(ii)

–/11 mks

3(a)(i)Medium4 marks

Snake’s-head fritillary, Fritillaria meleagris, is a rare plant found in wet meadows. Figure 3.1 is a photograph of part of a snake’s-head fritillary plant.

Figure 3.1, a photograph of part of a snake's-head fritillary plant with two chequered bell-shaped flowers hanging from an arching stem

Scientists first discovered a single snake’s-head fritillary plant in a meadow in 1925. They counted the number of snake’s-head fritillary plants in the meadow over a number of years. Table 3.1 shows the scientists’ data.

Table 3.1

time after the snake’s-head fritillary plant was first discovered / years	number of snake’s-head fritillary plants counted
36	10
49	30
60	50
68	110
80	950
92	725
99	740

Plot a line graph on the grid of the data in Table 3.1.

Draw with the mouse or a finger.

3(a)(ii)Medium2 marks

Describe how the number of plants shown in your graph changes over time.

Your answer

3(a)(iii)Easy1 mark

State the dependent variable in this investigation.

3(b)(i)Medium3 marks

A student wanted to estimate the number of snake’s-head fritillary plants in a meadow. • Using simple random sampling, the student counted 9 snake’s-head fritillary plants in an area of the meadow that was 40

m^{2}

. • The meadow was rectangular shaped with a length of 300 m and a width of 1100 m.

Calculate the mean number of snake’s-head fritillary plants per

m^{2}

Calculate the area of the meadow.

Estimate the number of snake’s-head fritillary plants in the whole meadow.

3(b)(ii)Easy1 mark

Suggest why the student counted a sample of plants rather than counting all of the snake’s-head fritillary plants in the meadow.

Your answer